Forum Discussion

afinepoint's avatar
afinepoint
Explorer
May 28, 2013

Is tow vehicle's battery and trailer's isolated from each?

Is the tow vehicle only wired to the trailer's lights and brakes when attached? Was curious if other loads could get power from the tow vehicles's battery such as the power jack? I would think t...
wa8yxm's avatar
wa8yxm
Explorer III
May 29, 2013
Generally speaking the towed and towing batteries are isolated UNLESS THE ENGINE IS RUNNING and at that time they are conjoined. (So they both charge)

A device on the towing vehicle called an Isolator (Either a diode box or a relay/contactor/solenoid) does the magic.

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