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August 21, 2014, 11:57:46 PM

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Author Topic: Headlight only works with flash trigger  (Read 51 times)

Superchuck

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Headlight only works with flash trigger
« on: August 19, 2014, 02:05:54 AM »
Strange headlight problem: I replaced my burnt out 7" sealed beam with a generic reflector, lense, and h4 bulb today. It worked great when starting my ride but within 30 min I noticed the bulb was out. Stopped to check it out and it wouldn't light on the low beam or high beam switch setting, but when I pulled the little yellow trigger that flashes the light, it lit up. Got some tape and taped the trigger down then rode for the rest of the night.

I'm assuming it's a wiring issue and I'll have to troubleshoot it with diagram and multimeter but has this happened to anyone? Any ideas where to start?

Thanks! Ps the bikes running great with the new chain and sprocket!

Chuck

boggy

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Re: Headlight only works with flash trigger
« Reply #1 on: August 19, 2014, 05:00:40 PM »
Chuck,
The same behaviour happened on my AVL, but I hadn't swapped the bulb.  The red wire connected to the the bulb was frayed.  It routes out the back of the nacelle and is exposed and I think the elements took their toll.  The blue and green one route inside the nacelle and are wrapped in sheath, so maybe they are better protected.

Take a look in there and follow that red wire.  See if it's been chewed up a bit.  If you turn your handlebars to the right, you should be able to see the red wire on the left side, but you will probably have to pull the headlight off.

Boggy
2007 AVL
2006 DRZ400SM

Superchuck

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Re: Headlight only works with flash trigger
« Reply #2 on: August 19, 2014, 11:23:48 PM »
Great thanks for the pointers!  Also the h4 bulb sticks further back which causes the wires to interfere a bit with the speedo cable so this friction could be part of the problem.

Thanks again!