The power pin on the 7-way trailer receptacle is always hot- truck running or not.
Again, figures. The standard for the brake lead is blue.
The battery+ pin on the 7-way is definitely constant hot. Not sure what use the electric brake feed would be as a 12v source? It’s going to be PWM’d, and doesn’t supply 12v when the brakes are depressed.
Anyone know the amps capacity of that circuit?
Verified the 12V.
I stand corrected! My last truck it was on the ignition circuit so I had have the truck on for the dome light in the cargo trailer to work. Got curious and grabbed a meter to check the JTR and it IS hot full time. Learned a new one today. Lol
Thats kind of dangerous. I wonder if the jeep battery has any kind of protector in it. I was installing a camera system on my camper and had it plugged into my van. Just staying plugged in over night was enough of a drain to kill the battery on it.
That’s actually a good point. On my camper, there is a lead from that circuit on the trailer junction box to the deep cycle batteries so that the batteries receive a charge from the vehicle while towing. That circuit is the same circuit that all the 12V lights run off of. So, if that circuit is always hot and not disconnected when the truck is off, then stopping for a night at a rest stop for a nap without disconnecting the trailer plug means my lights are running off the trailer batteries AND the truck batteries combined .... hmmm.
If the trailer batteries are in good shape, and start out charged, that should not be a problem. This is where something like the Genesis Dual Battery Kit would come in handy. The isolator should keep the secondary battery from getting discharged, which would still let you start the truck if the trailer drains the main battery too low.
