12v symptoms I don't understand
Today while switching out 12v batteries my wrench momentarily shorted positive to trailer body (it sparked a little), I already had negative connected. Since then it appears that I only have 12v power...
Forum Discussion
When you created the short with the wrench there were no fuses in the circuit from the battery. Was the trailer on shore power at that time? If it was, then more of the wiring was in play, and fuses.
As described above you need to use a multimeter. Disconnect the shore power and the battery. Load test the battery. If it load tests good, reconnect it. Go to the DC distribution panel and check for voltage. Connect a temporary 12 v load here, something that draws current. If it works, move on. If it doesn't you know where to look.
You may have burned off a ground connection somewhere. Light loads, such as a fan or a light bulb may operate on lower voltage through a sneak circuit.
Be meticulous in your checking, working only with the battery and no shore power. Start at the battery and test towards the trailer. Always be sure that the circuitry behind you is good. Pay attention to the ground wires also.
As described above you need to use a multimeter. Disconnect the shore power and the battery. Load test the battery. If it load tests good, reconnect it. Go to the DC distribution panel and check for voltage. Connect a temporary 12 v load here, something that draws current. If it works, move on. If it doesn't you know where to look.
You may have burned off a ground connection somewhere. Light loads, such as a fan or a light bulb may operate on lower voltage through a sneak circuit.
Be meticulous in your checking, working only with the battery and no shore power. Start at the battery and test towards the trailer. Always be sure that the circuitry behind you is good. Pay attention to the ground wires also.
