so i had a set of Blazer driving lights bought from part sourse, worked great for a year but then in the winter would randomly stop working (figured id work on them in the warmer wether) well now they have totaly craped out. 12v tester shows power going to the lights so its not a fuse. doupt both bulbs blew at the same time so i asumed ground. re-located ground wire and nothing, striped ground only to find the copper has oxidized? and turned black through the whole wire. im assuming this is my problem?