This battery isolation solenoid shuts off the 12-volt feed from your vehicle battery to 12-volt accessories on your trailer when the ignition is turned off. This lets you run the trailer's electrical components without draining your battery.
Features:
Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.
Today we're going to review part number TR118665. This is the Tow Ready Battery Isolation Solenoid. Now this battery isolation solenoid will shut off your 12-volt feed from your vehicles battery to your 12-volt accessories on your trailer when your ignition is turned off. This will allow you to use battery powered electrical components on your trailer without draining your vehicles battery. Now, when you do install this, the mounting bracket right here is the ground. This does need to ground to a good clean metal surface. This solenoid is rated for 80amps.
The wire we recommend when attaching wires to this is usually 10 to 12 gauge size. Now, when you do install this, basically like I mentioned, this has to be mounted into a good clean metal surface to get to ground. Right over here, this would be your voltage that would come in from your battery. Over here would be your voltage that's going out to your trailer connector. This connection right here to the ignition switch power source. That's should do it for the review on part number TR118665.
The Tow Ready Battery Isolation Solenoid. .
Average Customer Rating: 4.7 out of 5 stars (61 Customer Reviews)
This battery isolation solenoid shuts off the 12-volt feed from your vehicle battery to 12-volt accessories on your trailer when the ignition is turned off. This lets you run the trailer's electrical components without draining your battery.It works, guess that means I hooked it up right! Not a lot of room to work with in the 2013 Honda Odyssey but turned out good. Should have moved it a little farther forward away from the air box and drilled 2 holes but I had a space to slide the left tab in and saved a hole. Yes it is very tight and grounded good. Going on a long road trip and now we'll have piece of mind knowing we wont be stranded out in the middle of nowhere for forgetting to unhook the trailer connector.
Things like vehicle radio and antenna motors for powered antenna are ideal for installing the relay in line. Either in your owners manual or on the fuse box itself, it should state which items are on while the ignition is on. You might consider using a fuse tap, which is a fuse you can attach a wire to and provides the 12 volts needed. Take a look at # F2526
Firestone Fuse Circuit Tap Kit
$18.92.
Rachael H - 12/1/2014
Gerald M - 03/23/2015
Purchased this to keep my starter from potentially pulling from my trailer battery on startup. This diode (part#: RM-690) would probably have done that job just as good, if not better, but wouldn't keep the trailer plug from having live power all of the time. I did install this solenoid, though, and it's actuated by my car's 12v accessory power (on only when car is on or in accessory mode - not during ignition). Additionally, I added a rocker switch to my cars interior, right under my brake controller, so I can turn the solenoid off completely when I'm not towing. I figured this would lengthen the solenoids life, and add to my peace of mind knowing that my trailer plug doesn't have a direct line to my vehicle's battery all the time. The solenoid itself is a little larger than I had expected, but it's been great to have so far. I'd recommend this product.
Dan G - 02/22/2021This is being used as a battery isolater in a 2006 Class C RV, replacing a failed Motorcraft part. It worked after installation, we’ll see how long it lasts! Only complaint is that the terminals for the battery connections partially obstruct the mounting flange making it a little difficult to install, especially when there is not a lot of room to work.
Would love to see a wiring diagram or instructions/video for install on etrailer. Otherwise good part.
After being energized 2 or 3 times this solenoid failed to open the circuit when denergized. After being tapped on multiple times with a screwdiver handle, it finally opened the circuit. The load was only what my Tekonsha Primus IQ brake controller with no trailer connected. Have not checked it since the van this was installed in has been laid up for winter.
Tony B - 04/23/2018My camper stopped charging the coach battery. Tested an found the isolator wasn't passing power thru. Searched online and this was the least expensive (by far in some the cases). Quick shipping, easy install and charging again. I am a happy camper! Thanks!
Timothy - 09/04/2019Kit was sufficient to completely wire my 66 F100 for Electric brakes. I wrapped all wires under the hood with black tape and used original harness clips below the hood to cowl seal for a " factory harness" look. Truck is almost all original and a bit rusty but it's mine.. I wired an etrailer solenoid in line to trailer power, it is energized by the ignition and I added an led toggle switch under the dash to interrupt that circuit of needed. All the parts arrived in great condition and on time.
Replacing the battery isolator seems to have solved a number of electrical issues in my 30 year old RV. Now the engine will recharge the house battery again even though solar still does most of the work. New isolator takes a a smaller draw off the wiper circuit which also powers the cruise control. Now cruise doesn't disconnect when the wipers are turned on. Only one problem in installing. Original had slots in the mounting bracket. Replacement has holes. Both mounting screws had to be completely removed. One was quite awkward to get to. Installing could have taken 5 minutes, but because of that second screw stretched out to maybe 20 minutes.
it's a simple part that just works as designed. Once installed it's good to know your trailer Isn't draining your car's battery when shut off you car and park overnight or out to dinner or lunch with the trailer cord connected. Much less likely to have any battery issues or forget to replug in the trailer and drive off and have no trailer lights working.
Used this isolate trailer battery from car battery. This is third one I've installed and it works great. Learned something this time to clean up the wiring install. Window washer wire was right next to battery where this was installed so used that wire to hot it up when ignition is on.
the battery isolater solenoid works perfect when wired correctly when protecting my truck battery from my trailer winch battery when the winch is in use I highly recommend this product.
Big, strong and versitle. Battery will power Brakes, power lift , winch and breakaway.
Received quickly and in great shape
My truck came with only a four pin trailer connector. I installed a seven pin connector received from etrailer and realized I needed to prevent battery drainage on my truck caused by the trailer battery charging when the truck engine wasn't running. The battery isolation solenoid provided a perfect solution. Great product at reasonable price. As usual etrailer exceeded my expectations with next day delivery.
It's a relay/solenoid! Works great so far. We got this to wire our small teardrop for underway charging. I found an ignition-switched voltage source in the engine bay, and now I don't have to think about whether or not I've unplugged the trailer. Would use again.
Had to change my order after submitted on the web and that was done quickly with help from a great customer service rep. Received the order quickly and all parts were as expected. Love the online video provided by etrailer in helping to chose the right product and installing it, it is hard to improve on perfect.
Works well. I wish it was a bit smaller but it is high amperage.
Works great in the circuit I installed in my truck to charge my trailer battery while driving. Etrailer is my go to for my rv needs. Great prices and fast shipping are the norm.
NO INSTALLATION INSTRUCTIONS included as promised!!! I was told when I ordered that printed wiring diagram would be included in package. No instructions were included with the product or on package. Had to call CS and go online to find them. Not too tough but needed clarification on which post was power in and which is power out. Just frustrating being told one thing at time of order and not receiving as promised. Product works as intended.
The product was exactly what I wanted for the amount I was told it should cost. I wish there would have been instructions there just to make double sure I know what I'm doing but it's easy to find it online.
Kelly H - 01/04/2018Exactly what I was looking for. Works well so far.
Joel K - 02/13/2020Very happy with product construction didnt get to install it yet since it has been raining everyday since I recieved it,shipping was fast and overall experiance with etrailer was very good and I will be buying more from them and will definitely recommend to others
Does exactly what I needed; prevents the trailer from discharging the tow vehicle battery when ignition is turned off.
This simple device save the worry of forgetting to disconnecting the car from the trailer and the hassle of a dead battery when you do.
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