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Grounds Posted by Ari [Email] ![]() ![]() In Reply to: Turn Signal / Headlight Question, Dirk, Tue, 12 Feb 2002 09:20:16 Members do not see ads below this line. - Help Keep This Site Online - Signup |
I assume that when the headlights or tail lights come on, they don't come on brightly. My guess is you've got a bad ground. Normally, current flows from the switch, through the light bulb, and to electrical ground (chassis). Usually the ground point is shared by a bunch of bulbs. But if the ground point is bad (due to corrosion), current flows from the switch, through the bulb, but since the ground point is bad, it flows BACK through another bulb sharing that ground point until it finds ground. So all the bulbs involved light, just not as well because they're sharing the voltage.
The most common place for a bad ground is at the taillights on a 900. Each light cluster has a single ground wire to chassis, usually a black wire. See the FAQs about 900 tail light grounding, but what you'd do is remove the ground wire from the chassis, clean the surfaces well with some fine sandpaper or Scotchbrite, and bolt things back down. In some cases, it helps to actually solder on another ground wire, as the factory installation is marginal.
Usually the problem is at the rear lights, and the headlight problem is because of the running lights at the back that come on with the headlights. But you might have a problem with grounding at one of the front headlight installations.
Clean up the grounds at the four corners, and that should fix the problem.
Good luck!
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