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The hot wire going to the trailer should be hot only when the truck is running. This is so the trailer won't drain your truck battery. The trailer battery is for operation of trailer interior lights, water pump, fridge, anything else in the trailer that uses 12 volts. The trailer battery also doubles as power for the breakaway brake switch.
Typical truck wiring comes from the battery to a fuse and relay, then to the receptacle on the truck. The relay is pulled in when the truck is running (the relay gets its signal from a circuit that's hot only when the key is on).
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'94 F250 supercab 4x4, original owner, 4.10LS, DIY elec fuel, Tymar air intake, Adrenaline HPOP, Beans tunes on 4 position VA chip, VDO gauges (boost,pyro, outside temp), Ford digital AIC, DPPI downpipe, gutted EBPV and turbo pedestal mod, Con OFE clutch, add-a-leafs front and rear, Monroe Reflex shocks, Milemarker 449SS hubs, towing 25' Mallard travel trailer
coming soon: 6.0 IC
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