But it's always hot, even with the key off.
Ideally, hot when the key is in the "run" position, not acc or off.
OK, 10AWG is good, probably a 30A circuit; what prevents it from charging heavier than 30 amps, let's say a large battery in the trailer is dead, start the truck up, 160A or maybe 220A alternator?
Sure, the fuse would blow, but it won't reset.
So you would have to charge the battery up first, then hook it to the truck, so it would maintain the fully charged battery but maybe not charge a low one?
I have a mind like an engineer is my issue, so I think too deeply about many things.
but all valid concerns.
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