Truck harness or trailer harness issues.
This is a runoff from a previous post I had. I'm not getting brake lights or blinkers on my camper. From a suggestion on my previous post I checked the terminals of the harness on the truck. Yellow wa...
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I would try using jumper wires on the trailer plug to verify proper operation. First thing to remember when looking at the trailer plug is that everything is backwards so either draw your own diagram or at least remember it.
The first thing to do is make sure that your trailer connection is getting a good ground. Using a VOM set for continuity, touch one probe to the ground (position 1) on the plug and touch the other probe to an unpainted spot on your frame. If you don't have continuity between the plug and the frame, you will always have problems with your lights. Grounding problems are almost alwyas the cause of trailer light problems.
Using a good battery-use jumpers to attach the negative to the ground, jump from positive to blade 5 (yellow) and your left brake/turn signal lights should come on.
Move the positive jumper to blade 6 (green) and your right brake/turn signal light should come on.
Move the jumper to blade 3 (brown) and your marker lights and tail lights should lights should come on.3
The first thing to do is make sure that your trailer connection is getting a good ground. Using a VOM set for continuity, touch one probe to the ground (position 1) on the plug and touch the other probe to an unpainted spot on your frame. If you don't have continuity between the plug and the frame, you will always have problems with your lights. Grounding problems are almost alwyas the cause of trailer light problems.
Using a good battery-use jumpers to attach the negative to the ground, jump from positive to blade 5 (yellow) and your left brake/turn signal lights should come on.
Move the positive jumper to blade 6 (green) and your right brake/turn signal light should come on.
Move the jumper to blade 3 (brown) and your marker lights and tail lights should lights should come on.3
