Electrical light problem

[Ralph Schwerin]

I am looking for some help with an electrical proublem. I hAVE A 1985 16' Scamp w/side bathroom. I had to replace th 12 Volt lioght on the side of the cabnet on thr stove side of our trailer facing the back bed. I removed the wire nuts from the light and the wires got mixed up. There is a white and black wire coming into the cabnet up the wall along side the window and 2 black wires going along the front edge of the cabnet tword the front of the trailer. The white and black wires can,t be pos. and neg. because they don,t have any voltage between them. All the power cnverter circuts have 12 volts. None of the 12 volt lights or the pump work on the trailer. When you turn the light on the side of the closit on the front amber marker lights go on but the light on the closit doesn't go on. Please help me if you can. R Schwerin Email rschwerin@wi.rr.com

[Darwin Maring]

Marker lights are on a separate circuit connected to your tow vehicle only and should not turn on when you turn on the closit lite.

Sounds like your converter is not making 12VDC to the right circuit or you have a bad switch in the converter or a blown fuse. Do you have a battery installed?

[Dennis Clinton]

Quick review sounds like you have a bad ground somewhere. Start with your converter, making sure each circuit has power, then move out from there checking each fixture for 12v. Since nothing has power, it's probably the ground from the converter somewhere. Use a test light hooked to a good ground and try it on each circuit.

[Dan Meyer]

When strange things happen on a 12 volt DC electrical system, rule number 1 is to check your grounds. All of them. Even the ones you don't know exist.

When your grounds are perfect, start troubleshooting other power problems.

Also, the black wire is unlikely to be negative.

-- Dan Meyer