Headlight wiring

[justasquid]

You are talking about HID's correct? If so, the initial amp draw can be as high as 18, but it will settle quickly to around 3-4 amps once the bulbs are warmed up. This usually takes about 3 seconds. The actual draw is far less than a standard bulb, once its warmed up. But heavier wire and relays would be needed for the initial spike.

the ones I used spike to about 14 amps, but only for about 2 seconds, then quickly came down to around 3.5.

The only wire you may have to upgrade would be the main feed wire from the relay to the headlight, based on the given diagram by BH. HID's do not run hotter or take more power once they have warmed up. they draw less power than a standard halogen, they run cooler, and the last a lot longer.

If only one 30 amp relay is there for two HID lights, then a larger relay would be a good idea. I actually ran one relay for each headlight. Since my conversion wasn't common, I wanted to cover all bases in case a relay or fuse blew, I had a better chance of still having one headlight. 3 years later, no issues at all.

I did do a write up on another forum I am a member on. Heres the link in case you want to take a look. Its not exactly the same since its on a bike, but it should be very similar.

http://cbrforum.com/forum/showthread.php?t=93791