The larger starter terminal on GM cars is used as a tie point for other electrical circuits. You'll find some small wires bolted to that terminal along with the fat battery cable. Those small wires start out with a short "fuse link wire" spliced in. Those are a smaller diameter than the wires they protect so they're the weak link in the chain, and the insulation will not melt or burn.
You test a fuse link wire by pulling on it. If it's good, it will act like a wire. If it's burned open, it will act like a rubber band. Auto parts stores have replacement fuse links. You'll get a piece long enough for two or three repairs. The color is chosen according to the current rating. Common colors are dull green, gray, black, white, and orange.
Monday, October 20th, 2014 AT 3:02 PM