100W+ headlights in an S5

soldave · 09-09-2010, 07:53 AM

Wondering if the stock harness will handle 120W or 130W headlights in an FC or not. We all know how brittle the stock wiring harness is in these cars and am thinking a lot more power in the lights is gonna heat up those wires quite a bit more. But is it an excessive amount?

If it is, then is a parallel wiring system what you'd need to get it working, right? Bear with me as I'm not the most electrical-minded guy but want to make sure I'm thinking this through right. Looking at the wiring diagrams it looks like I'd need to get a 30A inline fuse running from the battery. This would then go through 2 new relays alongside the 2 original ones (the signal wires being spliced so it all comes in at the same time) and then a ground from the 2 lights back to the battery or a suitable grounding point.

Does that sounds vaguely sane or am I completely off?

09-09-2010, 07:53 AM	#1
soldave Rotary Fanatic Join Date: Jun 2010 Location: Okinawa, Japan Posts: 134 Rep Power: 15	100W+ headlights in an S5 Wondering if the stock harness will handle 120W or 130W headlights in an FC or not. We all know how brittle the stock wiring harness is in these cars and am thinking a lot more power in the lights is gonna heat up those wires quite a bit more. But is it an excessive amount? If it is, then is a parallel wiring system what you'd need to get it working, right? Bear with me as I'm not the most electrical-minded guy but want to make sure I'm thinking this through right. Looking at the wiring diagrams it looks like I'd need to get a 30A inline fuse running from the battery. This would then go through 2 new relays alongside the 2 original ones (the signal wires being spliced so it all comes in at the same time) and then a ground from the 2 lights back to the battery or a suitable grounding point. Does that sounds vaguely sane or am I completely off? __________________ Big in Japan: soldave.ismysite.co.uk