BGH1R

iTrader: (3)

i try to turn them on and it keeps blowing the fuse ... 1st one was a 15A so i tried a 20A

not sure what to do next ? would it have anything to do with the bulb ? they worked with the 4300k bulb now ive put in 8000k to match my headlights

any advice would be great cheers .bob

aegean93l

Never uprate the fuse. It is designed to limit the current that can travel through the wire, depending on the size of the wire. So, if you allow more current through the wires than is designed, you can end up with a fire.

Did you do any wiring when you switched lamps, or was it direct plug n play?

Chelspeed

I'm assuming these are HID based on the 4300k comment?

If so then the peak in rush current when you first turn them on and the arc is striking can be much higher than the steady state current once they're running. It'll be this in rush current that is blowing the fuse. I had this on aftermarket HIDs and found it got worse in cold weather but in your case it looks like it's worse for the 8000k bulbs (tart). I went 15A (original for conventional blubs) to 20A and then 25A before it stopped blowing on first turning them on in mid-winter.

Normally I'd agree with the comment about not uprating the fuse without uprating the wiring. But in this case the steady state current will be lower than the wiring is designed for since HIDs take less current once running than conventional blubs. So you're only worried about the in rush current and I can't see that this peak current for a fraction of a second is going to have a detrimental effect on the wiring. But the downside is that you're degraded the protection in the event of a subsequent fault that leads to the steady state current increasing beyond what the wiring can take. I'd risk it.....