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I have a short in the circuit for my back-up lights. The 10 amp fuse for this 12 volt circuit blows every time I put the transmission in reverse. After doing some testing, I believe that the short is downstream of the relay. I've tried to find the problem area with no luck, and believe that I should just abandon the existing conductor and run a new one from the relay, splicing into the existing line somewhere near the lights (back of the coach). I was unable to find markings on the existing conductor, but it appears to be 10 or 12 gauge. I've checked various wire sizing charts and get wildly different recommendations from one to the other...anywhere from 4 to 16 gauge. What percent voltage drop is acceptable for this type of circuit? I've seen anything from 2 percent (critical) to 10 percent (non-critical). I know that I could simply purchase new wire to match existing, but would like to verify this decision with some "higher power." I drive a 36 foot, 1994 Foretravel U-240, and estimate that the length of run for this circuit should not exceed 40 feet. Thank you in advance. Tom Sonoma County, CA