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Will 12 Volt Feed from 7-Way on Tow Vehicle Overcharge Trailer Auxiliary Battery


thank you in advance - so i have the solenoid isolator and fuse tap - how does my trailer battery send a signal to the alternator to stop charging - ? I guess I am looking for the charge sensor ? truck runs, alternator charges battery - then when full stops - correct? to prevent over charging? so how do i do this on the trailer? thank you again


Expert Reply:

It's impossible for your trailer-mounted auxiliary battery to be overcharged by the vehicle battery via the 12 volt feed on the 7-way since it only passes through a low current trickle-type charge. In fact, this is only enough for a maintenance charge - if your trailer battery is completely depleted, this method of battery charging will not provide a full re-charge. For that, you need to use a battery charger like # 329-GEN1.

The battery isolator solenoid # TR118665 along with the fuse tap # F2526 you've installed shuts off your vehicle battery's 12-volt feed when the ignition is turned of to prevent the trailer battery from draining the vehicle battery. You don't need to worry about overcharging your trailer battery as it sounds like you're all set!

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