Re: Need help with Rear Light Failure message - Bulletin Board

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Re: Need help with Rear Light Failure message
Posted by Mark in Marine [Email] (#1837) [Profile/Gallery] (more from Mark in Marine) on Sun, 17 Dec 2017 14:50:59

In Reply to: Re: Need help with Rear Light Failure message, scott47 [Profile/Gallery] , Sun, 17 Dec 2017 07:00:01
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Sorry about using acronyms without reference - by VOM I meant volt-ohmmeter.

What you did was good, though, because you have observed that the lights are actually working, and the brake light switch is less suspect, since you can get the separate error message for legitimate brake light bulb 'failure' of a missing bulb.

If I were seeing what you have seen, my first step would be to get/borrow an inexpensive voltmeter and check the resistance between your bulb socket grounds and a good ground bolt back in that trunk/hatch opening. The tricky part is that the resistance will likely be low - and you will be looking for the DIFFERENCE of differences: Ohms between the ground connector of left light socket and bolt ground compared to Ohms between the ground connector of right light socket and bolt ground.

If those are different, then you have a data point, and if they are the same, you have a clue to look elsewhere.

By the way, my observation about a bulb melting its solder bump was probably caused by a not-very-springy (loose) socket connector with corrosion. That high resistance contact heated up and eventually melted a strange failure. We were fortunate it didn't get any worse than a failed bulb.

Hope this helps

Mark in Marine

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