Thanks for your responses. Here's how this played out from the beginning. Before I posted my question, a month ago, I installed the backup camera without checking the voltage. When I hooked up shore power (not truck) the camera worked, although on all the time, so I thought I could live with it. However, when I plugged in my truck to travel, no running lights, brake lights, etc. Zero. Took the camera out of the loop, and all worked. Obviously something is wrong.
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