F19 10amp blown. If replaced, light goes out, but blows shortly after. Inspected ALL harnesses close to headers, Nothing. (small loom melt on LH O2) Tuner left No# 4 plug wire loose, ARCING on dyno (and deliveried) I fixed it. I thought it was a header leak. Could this have Back feed the system?? (mechanic 30 years) Sensors all on ML amps, HIGH ENERGY BACK FEED???