Ok fellows, still stumped. Using the factory reverse alarm wire harness to power a reverse light. Worked for months til I tried to wire in key on for volt meter for second battery. Thought place I tried to originally splice in below fuse block for meter was culprit. Removed blue squeeze splice I left and reconnected wires. Still no light. I orginially ended up buying one of the mini fuse adapters with power wire an powered volt meter, leaving blue squeeze splice in place. All of the second battery accessories use a silinoid with toggle switch to cut on. Every thing works but reverse light. Ran temp wires to battery last night, straight wired, an light works. Just not when connected to reverse harness. Stumped. Last resort could straight to another switch but that’s a lot of trouble verse reverse powering light.....