stupid breakaway cable wiring...
I have been perplexed which is easy to do since I'm not an electrician but try to do things safely. I have wired up the breakaway switch as the diagram here suggests. I have crimped a ring termina...
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One difference is when plugged in you are using the vehicle battery;when not plugged in you are using the trailer battery. Measure the voltage the way you did, except with the wire connected to the breaks. If the trailer battery is weak, the voltage might be pulled to low.
Also check the ground wires. They are often notorious for giving false readings. I am always cautious about open circuit measurements because of possible back feeds.
You can also try connecting a wire directly from the battery to the one you believe energizes the break. If the brakes work the problem is in the brake switch;if they don't work, the problem is in the wiring to the brake. You may even be fooled by which wire the brake is, but not likely if you connected the switch where the old one is.
Problem solve to isolate the area not working.
Good luck.
Also check the ground wires. They are often notorious for giving false readings. I am always cautious about open circuit measurements because of possible back feeds.
You can also try connecting a wire directly from the battery to the one you believe energizes the break. If the brakes work the problem is in the brake switch;if they don't work, the problem is in the wiring to the brake. You may even be fooled by which wire the brake is, but not likely if you connected the switch where the old one is.
Problem solve to isolate the area not working.
Good luck.
