alternator wiring harness - 2004 Volkswagen Jetta TDI May 26, 2010TDI has 70k miles on it. There is a small plastic cover included in the plastic battery cover. The small cover (fuse box cover?) has melted a hole in it and the dealer says I need to replace the alternator wiring harness which is generating excessive heat. vw beetle alternator harness | eBay www›Search›vw beetle alternator harnessFind great deals on eBay for vw beetle alternator harness. Shop with confidence.