OK last year I replaced my voltage regulators on a 1996 200 Merc EFI, serial number OG406730 ( One regulator had a burnt yellow wire) I replaced both, with Quicksilver part 883072T ( the stock regulator was number 815279 5 )The new regs came with a extra black wire, I suppose it is a ground? I didn't hook it up, should I and if so what do I hook it to ? My tach still ocasionally reads erratic, could this be the reason? Did they send me the wrong regulators? Let me know what you think. Thanks