I agree that a grounding issue seems the most-likely cause for your refurbished 1965 Trailblazer camper's lighting issue.
If the camper was stored for a time after you re-worked the ground wire it is possible that corrosion has developed. We often suggest applying dielectric grease # 11755 at the grounding point both before and after securing the ground wire ring terminal to the trailer frame. The grease blocks moisture and grime that can lead to corrosion. You should not need a second... view full answer...
To run down a short in a wire you will need to use a circuit tester, item # PTW2993 if you need one, to test the wiring and find the short. The place I would start is on the vehicle side of the converter. Check each wire there, with a helper to turn on turn signals and step on the brakes and be sure that each circuit is functioning properly. While you are behind the taillights make sure the ground wire is attached to a good grounding point.
Next I would test the wiring coming out of the... view full answer...
Sounds like the problem is the ground wire of your brake assemblies. If you have power to the assemblies but the ground wire isn't connected to a clean metal surface of the trailer frame then you would have the problems you described.
Also check the condition of the main trailer ground that goes from the trailer connector to the frame of the trailer. view full answer...
A fuse blowing indicates to me that there is a short. If it happens when you connect the trailer to test the lights then that would indicate a problem on the trailer side.
Lets first look at the wiring harness on the van. Make sure the ground wire is attached to a clean metal surface. Moving the ground might help. When you plug in the 4-Way to the adapter, # 30717, make sure the connection is good and tight. You must have the ground wire from the adapter also attached to the vehicle frame.
This... view full answer...
There should not be power on the brake output wire unless the brake controller is sending back power. It sounds like something might be miswired at the 7-Way. Take a look at the picture I have included that shows the pin out of a vehicle side 7-Way trailer connector to make sure yours is wired the same way.
If it isn't then put the wires in the appropriate places. Also check to see if any of the wires are touching each other inside the 7-Way. And if the 7-Way is dirty or corroded that... view full answer...
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