Steel is not the best conductor of electricity under the best of conditions. Add a bit of rust/corrosion at connector points & it can be downright unreliable.

You are on the right track, when you encounter a voltage drop, take every connection apart between the "good" voltage & the "low" & clean them & test again. It's not rocket science, just trace it out one connection at a time. Sure it's a PITA, that's why the pros get so much for doing it...

Dave

Last edited by Davepet; 09/27/08 11:19 AM.