Not only will the stock wiring not handle the additional load, neither will the stock generator which is rated at 22 amps. Figuring 6-7 amps for a 70/80 watt headlight and about 5-6 for even the small fog or driving lights, running lights, plus something for ignition, OD, etc. etc. and you are at or below zero. I did not find this out until I installed an ammeter and no longer wondered why my lights dimmed when I came to a light. A 70 amp alternator (Prestolite)which has a two-piece pulley and accomodates the wide 100 fanbelt, now keeps things at a minimum of 13 volts no matter what, even with the stereo blazing.