Headlight blowing fuses

heepofajeep · 06-01-2007

I am sure this is a really dumb question, but I am hoping you guys can help me with some quick troubleshooting...

My newly acquired 2002 zx7r is blowing the fuse in the headlight. It blows instantly on high beam, and intermittently on low beam...

So my [very lame] question is, does the fact that one is intermittent and the other definite mean anything as far as diagnosis goes?

Thanks!!!

zedx11 · 06-01-2007

check the wiring harness, make sure there are no shorts.

eidian · 06-01-2007

Quote:

Originally Posted by zedx11

check the wiring harness, make sure there are no shorts.

+1 and then follow the wiring up to the light--it's shorting somewhere. The intermittency (is that a word?) means that the short is probably from something that is loose that randomly grounds out. My guess is that you'll probably find some frayed wiring that is exposed.

bountyhunter · 06-01-2007

Check the bakelite connector that goes on the back of the headlight. They usually have three wires (HI, LOW, GND). If there is a current path to the ground line, it will blow fuses.

ALSO: make sure the correct fuse is installed (probably a 10A) and make sure it's the right headlight for the bike. If it is some funky, super bright off-road light it may be pulling too much current for the fuse.

xeon · 06-01-2007

Second checking the headlamp type... something that runs at 100+ watts doubles the current essentially from stock. That would be my guess from the observation of it blowing the fuse on high every single time as opposed to some of the time on the low beam.

06-01-2007	#1 (permalink)
heepofajeep Newbie Join Date: May 2007 Posts: 13	Headlight blowing fuses I am sure this is a really dumb question, but I am hoping you guys can help me with some quick troubleshooting... My newly acquired 2002 zx7r is blowing the fuse in the headlight. It blows instantly on high beam, and intermittently on low beam... So my [very lame] question is, does the fact that one is intermittent and the other definite mean anything as far as diagnosis goes? Thanks!!!

06-01-2007	#2 (permalink)
zedx11 yellow doesn't corner wel Extreme Forum Supporter Join Date: Oct 2005 Location: KC, KS Posts: 21,637	check the wiring harness, make sure there are no shorts. __________________ Darrell Ignorance is a disease my friend. You should rid yourself of it.

06-01-2007	#5 (permalink)
xeon Wants better weather! BTK Expert Join Date: Sep 2005 Location: Culpeper, VA Posts: 839	Second checking the headlamp type... something that runs at 100+ watts doubles the current essentially from stock. That would be my guess from the observation of it blowing the fuse on high every single time as opposed to some of the time on the low beam. __________________ Black '06 Ninja 250R Red-n-Silver '99 YZF600R

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06-01-2007	#4 (permalink)
bountyhunter Way Too Much Free Time BTK Expert Join Date: Oct 2006 Location: Empire of kalifornia Posts: 1,407	Check the bakelite connector that goes on the back of the headlight. They usually have three wires (HI, LOW, GND). If there is a current path to the ground line, it will blow fuses. ALSO: make sure the correct fuse is installed (probably a 10A) and make sure it's the right headlight for the bike. If it is some funky, super bright off-road light it may be pulling too much current for the fuse.

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