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The "breakaway" battery doesn't receive a charge AT ALL
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Sounds like you have the small separate battery that powers your breakaway system. If so, it is totally isolated from the regular trailer batteries and the truck's charging system. It's not rechargable either.
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The hot wire going to the trailer should be hot only when the truck is running.
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Not really, depends on the year, my original truck wiring has the constant hot hot all the time, running or not.
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if the trailer battery hasn't been disconnected when you're trying to start the truck, the truck's starter motor will try to draw current from the trailer battery as well as the truck's battery.
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Not true, the constant hot first goes to the inverter which prevents that from happening. I've never disconnected mine for over 20 years and never known anyone who did.
