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Loctite Bulb, Lamp, and Electrical Connection Dielectric Grease - 0.33-Oz Tube

Loctite Bulb, Lamp, and Electrical Connection Dielectric Grease - 0.33-Oz Tube

Item # LT37534
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Loctite Bulb, Lamp, and Electrical Connection Dielectric Grease - 0.33-Oz Tube Dielectric Grease LT37534
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Loctite Accessories and Parts - LT37534

  • Wiring
  • Dielectric Grease
  • Loctite


  • Seals electrical components
    • Prevents shorting
    • Seals out contaminants
  • Preserves weatherstripping and molding on any rubber, plastic, metal or ceramic surface
  • Made in the USA
  • Quantity: 0.33-oz tube

  • Trailer wiring connections
  • Distributor caps, spark plug boots
  • Automotive lights
  • Fuses
  • Battery terminals
  • Lubricates and preserves rubber and plastic rubber molding and weatherstripping
  • Protects ceramic and metal

Loctite Dielectric Grease protects electrical components and connections by sealing out moisture and preventing corrosion. Ignition system components and lights last longer and are less likely to short out in wet weather when sealed with dielectric grease. Rubber and plastic weatherstripping and molding also last longer and stay flexible when lubricated with dielectric grease.

Replaces LT988755

495545 Loctite Bulb, Lamp and Electrical Connection Dielectric Grease

Alternate part number: 37534

California residents: click here

Customer Satisfaction Score:

Customer Reviews

Loctite Bulb, Lamp, and Electrical Connection Dielectric Grease - 0.33-Oz Tube - LT37534

Average Customer Rating:  4.8 out of 5 stars   (121 Customer Reviews)


This dielectric grease is great for making permanent outdoor wiring connections. It does a great job at helping fight rust and corrosion. Used on the attaching metal parts in combination with electrical tape on the outside of the parts, it really keeps the parts working for many years into the future. I also use it on the vehicle side of trailer wiring to ensure proper connections to avoid lighting failure while heading down the road with a trailer. Just add some when necessary to keep it covered and it helps a lot.


Thought I had a bad wire but it turned out it was some water and crud in the connector. Grease fixed it. Keep it in my trailer tool box.

by: 06/01/2021

Exactly what I needed to rewire a 20-year-old trailer that was starting to show it's age with inconsistent lighting performance and continuity issues. In addition to purchasing this lighting harness, I upgraded all my incandescent bulb side markers and taillights with LED units and complete rewired the trailer. etrailer had everything I needed in one place with excellent pricing and superb service. Everything is working great and I love the brightness and visibility of the LED lights.


A little tube of dielectric grease - works as it should: smear it on the electrical terminals of the trailer's electrical connector (or in any other automotive electrical contact that you want to protect from the elements) and it helps keep moisture and corrosion at bay . Grease is, by its nature, a tad messy - but this product works well for its intended purpose.


I bought a small tube of dielectric grease back in the '70's when I lived in Iowa. All the humidity and winter-time salt on the roads caused many shorts in the electrical connections of older vehicles (1969 Camaro).

I've lived in Arizona since the late 80's, but my tube was about empty and I saw this on your website (plus I needed an item or two to get free shipping!). What little is in my old tube now resides in the electrical toolbox.

Five stars for etrailer!


Used it on new T-One Vehicle Wiring Harness 4-Pole Flat Trailer Connector once installed, and will use it for vehicle and trailer light bulbs and other electrical connections. Good product.


Product assembled as expected, less the metal bracket that doesn't assemble to the frame without partially removing the bumper. I chose not to mess with the bumper and directly mounted the unit to the bumper as others have done. Other than attempting to attach the bracket to the frame without luck, the assembly only took 20 minutes.


It is dialectic grease. It is loctite brand. What more can you ask for.

James B.


One year later and no corrosion in any connector or light socket.


I haven't opened this one as yet. I've been using the dielectric grease that came with the four flat connection. I plan to keep the connections clean and apply additional grease as needed.


Installed fine on my 05 Hyundai Santa Fe. Watching both videos helped with the installation. I also was sure to use the Loctite dielectric grease.


Bailey was more knowledgeable than the manufacturer of the parts I purchased. The order was shipped out the same day. Spectacular service to say the least!


Dielectric grease is a must in order to have solid connections. Even if you live in a drier climate, you need this.


Dielectric grease to help my trailer connectors. Works great!


I am completely satisfied. The package arrived quickly and I was able to install on my truck the same day with help from the installation videos. I will definitely purchase from in the future. I have saved money by spending with and doing the upgrades myself.


Great for all your automotive and travel trailer electrical needs.


Typical tube of Dielectric Grease,works well.


Perfect fit and the right wiring connection for my Karavan trailer


Great product. Great price. Great how-to videos, which is why I bought from etrailer. Perfect mix of content and product offering!


Easy to apply, came to me quickly, and working well for my trailer lights.


seems to work very good and makes it easier to plug in connectors.


I am so glad I came across, They have what I need in stock, and show you how to use and or install the product.
They have great prices and fast shipping, What else could you ask for!


Product worked excellent when encountering a tight fit on electrical connection. Very pleased.


Does what it is supposed to do. Working great


Product and service were great. Installed in less than 20 minutes after watching etrailer and you tube videos.


Works as expected. Precision Tip simplified application. Appreciated that I could get all the install accessories delivered at the same time as the hitch itself.

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See what our Experts say about this Loctite Accessories and Parts

  • Electric RV Steps Vibrate When Closing After Installing New Motor
    I am not sure what model steps or motor you currently have, but there are a few reasons why there might be some vibration when closing the step. The first thing I recommend doing is making sure the new motor is mounted in such a way that it is making proper and secure contact with the gear plate, which is what will provide a ground connection. A weak ground connection can lead to the vibration and otherwise less than ideal motor operation for the step assembly. Also make sure that the...
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  • Installing Dielectric Grease on 7-Way Plugs to Prevent Corrosion and Keep Electrical Connection
    Dielectric grease is basically just applied in a thin coating to the connector plug. You can use # 11755 or # LT37534 if you prefer a smaller amount. I've attached a video to assist. Just like the connection on the back, you can add this to the trailer pins on the front of the connector as well to keep moisture and debris out to prevent corrosion. I've attached an article to help as well.
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  • Troubleshooting Brake and Turn Signal Not Working on Trailer Hooked up to 2013 Yukon
    The fact that the trailer works fine on your Tacoma is good news because that allows you to rule out the possibility that the issue is on the trailer and allows you to focus on the connections with your Yukon. Just disconnect the plug from your trailer and use a circuit tester to see if the signals are getting to your plug. You will also want to check location 3 in the fuse panel under the hood, which is the left trailer stop and turn lamp fuse. If they are it might also be corrosion in...
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  • Trailer Brakes on Airstream Trailer are Weak Even After Adjusting Them
    Usually when the brakes start to get weak it is because they need to be adjusted. If you had them adjusted and the problem persists it could be a problem with the brake magnets. First, you can visually inspect the magnets and if you can see the windings coming through they will need to be replaced. To further test the magnets you can follow the help article I have linked. Inspect the wiring to the trailer brakes, the magnet ground wires, and the trailer connectors on truck and trailer....
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  • Needing a Wiring Harness Adapter to Hook a 1997 Chevrolet 1500 Truck to Trailer Lights
    For your 1997 Chevrolet 1500 truck, I recommend the Hopkins Plug-In Simple Vehicle Wiring Harness, # 41125. This harness will quickly install on your vehicle using a simple T-connector to plug into your OEM wiring. You will not have to cut or splice into your existing wiring. I also recommend using dielectric grease, # LT37534, when installing this wiring harness. Just a apply a small amount in each of the harness's plug end prior to installation. The grease will help prevent electrical...
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  • Trailer Wiring Harness 118624 Only Plugs Half Way Onto a 2013 Land Rover Evoque
    Is there room for the connector on # 118624 to go on any further or does it stop half way? It will be a tight fit and it might take a little more muscle to fully seat the 2 connectors. You could use some dielectric grease, # LT37534, on the connections and it could make sliding it on easier and provide moisture protection.
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  • Troubleshooting a Possible Faulty Vehicle Wiring Harness for a 2008 Kia Sedona
    Sounds like the power converter on your T-One Vehicle Wiring Harness, # 118410, has shorted out and will need to be replaced. The converter is designed to divert the lighting signal when you turn on your lights or use the brakes or the turn signals on your Sedona. If these functions are not working properly, then the issue is in the converter box. Before you replace it you will want to inspect the wiring of your trailer to see if you can find anything that would cause the box to short...
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  • Will Tow Ready Adapter w/ Lamp-Out Sensor Bypass # 20142 Work on 2005 Land Rover LR3
    The Tow Ready Adapter # 20142 is intended to work on a range of European import vehicles including your Land Rover LR3. It is not a vehicle brand-specific item. According to my contact at TowReady this item should operate as intended on your LR3 to prevent low-current draw LED trailer lighting from triggering bad bulb error messages on your LR3's dash display. My contact has had no reports of issues with this item used in Land Rovers. Before installing this adapter it is suggested that...
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  • Is the 6-Pole Square Trailer Wiring Connector Kit Water Proof
    I wouldn't say that the 6-Pole Square Trailer Wiring Connector Kit # 37995 is water proof. It is weather resistant. If submerged for long enough water could still get to the pins. That is why we recommend using dielectric grease such as # LT37534 on electrical connections to repel moisture.
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  • Does The Tekonsha T-One Vehicle Wiring Harness 118252 Include Dielectric Grease?
    The Tekonsha T-One Vehicle Wiring Harness # 118252 does not include dielectric grease, unfortunately. With that said, you will want to grab a tube of # LT37534 to go along with this harness, if you do not already have some. Just to confirm as well, this harness will fit a 2010 to 2018 Lexus RX 450h with the factory Tow Package, so you will have no issues with your 2011. I included an install video of this going onto a 2011 RX 350 as we do not have one with an RX 450h as of yet, but the...
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  • Can the Tow Ready Wiring Harness part # 118258 be Installed on Outside of a 2007 Hyundai Santa Fe
    We have heard from several customers who have done exactly what you are considering and just installed the Tow Ready Wiring Harness part # 118258 on the outside of the vehicle so as to avoid removing interior pieces. It's not the recommended installation method that Tow Ready suggests but it should work fine. I would strongly recommend the use of dialectic grease for all of the connections to prevent corrosion. For that you would want part # LT37534.
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  • Troubleshooting Brake Lights and Turn Signals on 2000 Ford Excursion With 7-Way
    Since everything worked when you hooked up your trailer to another vehicle we know the issue is with your 2000 Ford Excursion. The most likely issue is that you have a blown or missing fuse so check Fuse Location 13 in the Passenger Compartment Fuse Panel and replace as needed. I do recommend checking your owner's manual to confirm this is the location. You will also want to check your Excursion's plug for corrosion, which can be green or white in color. A build-up of corrosion can interfere...
    view full answer...
  • 2011 Range Rover Sport Towing a Trailer with LED lighting
    The Tow-Ready trailer connector adapter # 20142 you referenced is designed to work on a range of European import vehicles. This adapter will prevent low current draw on your LED trailer lighting from triggering error messages on your Range Rover Sport dashboard display. Before installing this adapter it is suggested that you check that your trailer connector's contacts are clean and free or dirt or corrosion. You might also want to apply dielectric grease like # LT37534. I included a...
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  • Is the 4-Pole Connection On A T-One Wiring Harness Waterproof For A 2017 Ford Escape
    The T-Connector Vehicle Wiring Harness # C56320 is the harness that is designed to custom fit the 2017 Ford Escape. The 4-pole flat trailer connector is designed to fit tight together with the 4-pole connection in the trailer. Using dielectric grease # LT37534 will help seal the components of the plug and prevent corrosion from moisture. However, the 4-pole connection is not completely waterproof. Using the dielectric grease will help prevent some water contamination, but the plug will...
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  • Trailer Brake and Turn Signals Not Working on One Vehicle But Working on the Other Vehicle
    The issue with your boyfriends trailer lights still sounds like a ground issue, but there are a few things he can check. He needs to make sure that on both the connector on his truck and the trailer plug is clean and free of any corrosion. I recommend using a dielectric grease, # LT37534, once the plug and connecter have been cleaned and inspected. The grease will prevent corrosion and eliminate water contamination. If the trailer plug and vehicle connecter have check out and are clean,...
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  • Trailer Lights not Working When Connected to Truck
    In order to determine the specific problem, you will need to use a circuit tester such as # PTW2993 to test the connector on your Ram after disconnecting it from your trailer. Check the wiring going into your harness from your taillights to see if those wires are carrying the correct signals, if not then the issue is with the vehicle wiring. If the signals going to your harness are okay, you'll need to test the signals coming out of the harness, and if they are correct then your issue...
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  • How to Install Hopkins Custom Fit Vehicle Wiring # HM40975 in 2014 Nissan Pathfinder
    The Hopkins Custom Fit Vehicle Socket # HM40975 that you referenced is a combination 4-pole/7-way vehicle-side socket for use in the 2014 Nissan Pathfinder that is equipped with the factory tow package. This part plugs in to the vehicle's wiring using its round U.S. Car Connector that would currently be installed at the back of the factory 7-way. I have linked you to a video showing this item being installed in a different vehicle; although the truck is different the process will be the...
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  • Troubleshooting Sticking Switch on Optronics Euro Style Interior Light
    If you are able to get into the RV Euro Style Interior Double Ceiling Light with Built-In Switch # RVIL22 switch, a little dielectric grease # LT37534 will help the electrical connections as well as helping the switch to function without sticking.
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  • Can Pollak 2-Pole Socket Connector be Mounted on a Horizontal Surface on the Back of a Boat
    There isn't a required mounting orientation for 2-Pole Socket Connector # PK12801 so you could mount it face up on a horizontal surface. Keep in mind this is not a marine-rated product meaning that it is not going to keep water out. I recommend using some dielectric grease, # LT37534, between electrical connections. The grease is hydrophobic so it will repel moisture.
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  • How Weather Resistant are the Tekonsha T-One Trailer Wiring Harnesses
    The T-One Trailer Wiring Harness, # 118651, that you had installed on you vehicle will work fine in all weather conditions. The plug connections where the wires connect to the plug has a water tight fit. I would suggest apply some dielectric grease, # LT37534, on the plug ends. this grease will keep water out of the electrical connections when in use or not. If you are unhappy with how your local shop has mounted the harness, then I recommend a 4-Pole Mounting Bracket, # 18144. This bracket...
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  • Protecting a Trailer Side 7-Way Connector from Corrosion
    There isn't a cover for a trailer side 7-way connector. But what you can do is use some dielectric grease, # LT37534, to repel moisture and protect the contacts inside the connector.
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  • Troubleshooting Trailer Wiring Running Lights
    A 5-way will have the following functions: left turn and stop, right turn and stop, running lights, auxiliary, and ground. If everythying is working except for one function there are a number of potential issues you will need to troubleshoot for. you will need to use a circuit tester such as # PTW2979 to test the connector on your tow vehicle after disconnecting it from your trailer. Check the wiring going into your harness from your tail lights to see if those wires are carrying the correct...
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  • Can Hitch and Wiring Harness from 2011 Kia Soul Be Installed on 2015 Soul
    Wiring harnesses for the 2011 Kia Soul such as the Curt # C56222 that fits versions without LED lights can certainly be re-installed in a different vehicle so long as that other vehicle is compatible. As it happens the 2015 Soul can use this same trailer wiring harness so it will work for you. I suggest you use dielectric grease like # LT37534 to help protect the connections from moisture and dirt. However, the hitches for the 2011 and 2015 model years are NOT the same so you cannot re-install...
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  • Troubleshooting Dim Trailer Left Turn Signal
    Yes, this could possible be an issue. Sometimes a faulty ground can limit the amount of current that can flow to the lights. It can also cause your lights to behave in unpredictable ways. My recommendation would be to hook up a 12V, well charged, battery directly to your trailer connector. Apply the negative terminal to the connector ground and then apply the positive terminal to the different light pins. If the lights are still dim, your problem is in the trailer wiring. If this is the...
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Info for this part was:

Employee Raymond P
Written by:
Raymond P
Employee Jeff D
Installed by:
Jeff D
Employee Brent H
Installed by:
Brent H
Employee Chris R
Video Edited:
Chris R
Employee Matthew S
Updated by:
Matthew S

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