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940 rear passenger brake/tail light 900

posted by  spook on  Sun Jan 19 07:07 CST 2020
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last visit: Fri Oct 24 08:06 CST 2014
[RELATED]

Dear GAcyclops,

Hope you're well. Yes. If you have a "known good" replacement bulb burn-out relay, substitute that for the in-service unit.

If there's no change, then remove both light clusters, clean - using fine steel wool - all bulb-holder and wire contacts, including the contact points on each cluster's ground strip. Make sure the contact tabs on each bulb holder press firmly against the contacts on the cluster housing. Gently bend outwards, any that seem "depressed".

Put a thin coat of di-electric (bulb) grease on all cleaned contacts. This inhibits corrosion formation. Sometimes an invisibly-thin layer of corrosion adds just enough resistance to trigger the bulb burn-out warning light.

You can do this clean-up bulb-by-bulb - and contact-by-contact - and spend a couple of weeks finding the one or two problematic contacts. Or, you can spend an hour to clean-up both clusters, from top to bottom (literally).

Hope this helps.

Yours faithfully,

Spook






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