Tow Ready Accessories and Parts - TR118665
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:
- Hard-wired, 3-pole solenoid switches off your vehicle battery's 12-volt feed when the ignition is turned off
- Allows you to use battery-powered electrical components on your trailer without draining your vehicle's battery
- Grounds on your vehicle's chassis
- Rated for 80 amps
- 1-Year limited warranty
118665 Tow Ready Battery Isolation Solenoid
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- Is a Battery Isolator Needed When Using 7-Way Connector To Charge the Trailer Battery
- You will need a battery isolator, like Tow Ready Battery Isolation Solenoid, part # TR118665, if you plan on leaving the trailer connected to the truck when the truck is off. If you unplug the 7-Way, the trailer battery cannot drain the truck battery. If you leave them connected, you would need an isolator to keep the trailer from drawing down the truck battery. The isolation solenoid has three connections.
If you are looking at the unit with the dome facing up and the 12v sticker right side
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- How to Wire the Tow Ready Battery Isolation Solenoid, # TR118665
- I spoke with my contact at Tow Ready regarding how to wire the Tow Ready Battery Isolation Solenoid, # TR118665. He stated that, if you are looking at the unit with the dome facing up and the 12v sticker right side up (like we have it shown in the picture on the product page), the left terminal is input, the right terminal is output, and the middle is auxiliary which will be connected to a source that will act as a switch to engage/disengage the solenoid. He stated that normally, the middle term
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- What is the Amp Rating of the Tow Ready Battery Isolation Solenoid, part # TR118665
- I spoke with my contact at Tekonsha and he informed me that this Tow Ready Battery Isolation Solenoid, part # TR118665, is rated for 80 amps continually and can handle spikes up to 100 amps.
He also said that a 160 amp spike will permanently damage the unit.
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- Charging a Trailer Battery Using a Battery Isolation Solenoid # TR118665
- If there was a wire in the harness that you found that was also a keyed power source (meaning that it has power when the key is on, and none when the key is off) you could wire it up the way that you described, but traditionally at a 7-Way connector there is not a wire that has voltage when the key is turned on and none when the key is turned off, unless it is the 12 volt power source. It just depends on the vehicle whether or not that circuit is keyed or not.
First thing I would do is use a
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- How to wire the Tow Ready Battery Isolation Solenoid # TR118665 and what Size Wire to Use
- When Using the Tow Ready Battery Isolation Solenoid, item # TR118665, for isolating a vehicle 12 volt battery from the power going to a 12 volt trailer battery through the vehicle trailer connector, we use 10 gauge wire, item # 10-1-1 or # 10-2-1, depending on the wiring situation. If the solenoid were attached directly between two batteries under the hood that are hooked to the charging system, I would use battery cables, the same size as the vehicle battery uses, on the battery posts, and a 10
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- How Well Does the Tow Ready Battery Isolation Solenoid, # TR118665 Perform
- The Tow Ready Battery Isolation Solenoid, # TR118665, will be installed on the vehicle that is doing the towing. If you are flat towing the 2011 Jeep Wrangler, then the battery isolator will be installed on the vehicle that is towing it. If the Wrangler is doing the towing, it will installed in the Wrangler.
The isolator works well. We have not had any comments that would indicate poor performance. It is a very simple design. One line goes in from the vehicle battery to one of the side termi
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- Battery Charger Recommendation for a Trailer Battery Stowed on a 2009 Chevy Silverado
- The way that the Tow Ready Battery Isolation Solenoid, # TR118665, is the center post gets connected to a 12 volt ignition source; something that is only on when the key is turned on/vehicle started. When the vehicle is turned on, it sends power to the solenoid and allows voltage to travel from the battery out to the trailer battery.
Once the ignition is turned off, it will not allow voltage to go through to the trailer battery. Think of it as a one way road that is only open when the vehicle
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- Connect a 12 Volt Circuit First to a Battery Charger and Then to the Battery on the Trailer
- If the trailer has a charger, the 12 volt circuit from the vehicle would need to connect to it. If the 12 volt circuit was attached directly to the battery, it would maintain the battery but not up charge it.
You may also want to look at any wiring coming out from the battery to see if there is a device using the battery when it should not be. A wire that is exposed and is touching metal can cause a short circuit and drain the battery.
I recommend getting a good battery charger like # CTEK
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- Where is the Best Place to Attach the 12 Volt Input for the Tow Ready Battery Isolation Solenoid
- The battery isolation solenoid itself, # TR118665, is rated for a maximum of 80 amps, but you will not need that much on the 12 volt circuit that powers the unit. The techs at Tow Ready suggest that the middle terminal should be attached to an ignition switch wire. That will carry the correct voltage and amperage needed. Typical 10 or 12 gauge wire will work. You do not want to go too small depending on the distance the power source is from the solenoid.
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- How to Wire the 7-Way Charge Wire to Trailer Winch Battery and Protect the Vehicle Battery
- For the best protection of your vehicles battery and wiring we recommend installing a 40 amp circuit breaker, # PK54540, inline on the charging wire going from your vehicle battery back to the trailer connector on your vehicle. If your vehicle has a factory 7-Way connector the charge line will be protected by a fuse in the power distribution box under the hood so adding a circuit breaker would not be needed.
If you are concerned about drawing power from the vehicle battery when the vehicle is
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- Can a Trailer Battery be Directly Connected to the 12 Volt Circuit on a 7-Way Connector
- First, you can connect the 12 volt circuit directly to the trailer battery. However, the wiring in the trailer wiring package is not able to charge up the battery, it can only maintain its current charge level. To up charge the battery, you would need to use a battery charger like # CTEK56158.
Having a hot 12 volt circuit when the trailer is disconnected is not going to be a problem but if you want to be absolutely sure there is no power loss or back feeding issues, I would recommend disconne
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- How to Wire the Tow Ready Battery Isolation Solenoid # TR118665
- On the battery isolator, # TR118665, the input should be coming from the battery, into the isolator, then out the other side to the 7-Way. The unit grounds through the mounting hardware. It will need to be attached to the metal of the engine compartment.
You need a wire that only has power when the ignition is on. Things like antenna motors for powered antenna could work. On the fuse box, it should state what items are on with the ignition. You could use a fuse tap, which is a fuse you can at
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- Will a 130 Amp Alternator on a 2000 Ford F-150 Damage the Tow Ready Battery Isolation Solenoid
- If your camper is drawing power from your 2000 Ford F-150 using the trailer connector, then a surge from your 130 amp alternator will not be an issue. The 12-volt power lead going to your trailer connector does not draw power directly from your alternator.
The Tow Ready Battery Isolation Solenoid, # TR118665, is designed to shut off the 12-volt feed from your truck battery to 12-volt power sources on your trailer when the ignition is turned off.
This unit is designed for vehicles that ha
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- Does the Battery Isolation Solenoid Ground to a Metal Surface Through the Mounting Hardware
- You will need to mount the isolation solenoid # TR118665 to a metal surface. This unit does ground through the mounting location. It will not function if it is attached to plastic so you will need to locate sufficient metal space so it will function correctly.
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- Using TowReady Battery Isolation Solenoid, Part # TR118665, When Operating Trailer Winch
- The Tow Ready Battery Isolation Solenoid, part # TR118665, protects your tow vehicle battery from excessive drain when using 12V trailer accessories by isolating the vehicle battery. It is operated by the vehicle ignition switch, so in order to isolate the tow vehicle battery from current draw from the trailer winch, the tow vehicle ignition key does have to be in the off position. This will let the winch pull power from the trailer battery rather than the vehicle battery.
Please refer to the
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