M-Class (W163) Produced 1998-2005: ML 230, ML 320, ML 350, ML 400 CDI, ML 430, ML 500, ML 270 CDI

Tail light gremlins

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Old Jul 11, 2013 | 10:06 PM
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Tail light gremlins

Wife's ML320 has an obvious wiring issue with the tail lights. When brake lights and a turn signal is on, the brake light on the opposite will blink, and if the tail lights are on, then the back up light will blink instead of the signal. It all points to a bad ground, but I don't know where the grounds are. Can someone point me in the right direction? Thanks
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Old Jul 12, 2013 | 04:31 AM
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Having a bad bulb in any location will cause this phenomenon. The ground filament is touching the positive filament.
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Old Jul 13, 2013 | 08:22 AM
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Originally Posted by Maj. Dundee
Having a bad bulb in any location will cause this phenomenon. The ground filament is touching the positive filament.
I believe this situation would actually cause a short and blow a fuse. Regardless, when testing continuity between the tail light grounds and the battery negative terminal there is resistance. I believe a ground needs to be cleaned. Where are those grounds?
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Old Jul 14, 2013 | 05:51 AM
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Originally Posted by Avec
I believe this situation would actually cause a short and blow a fuse. Regardless, when testing continuity between the tail light grounds and the battery negative terminal there is resistance. I believe a ground needs to be cleaned. Where are those grounds?
Your assumption is incorrect. It will not blow the fuse every time.

As suggested, why can't you simply check all of your bulbs.
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Old Jul 14, 2013 | 05:09 PM
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Originally Posted by Maj. Dundee
Your assumption is incorrect. It will not blow the fuse every time.

As suggested, why can't you simply check all of your bulbs.
Did you read my entire post? Apparently you missed when testing continuity between the tail light grounds and the battery negative terminal there is resistance I have tested both sides and both show resistance.

Please, where are the grounds?
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Old Jul 15, 2013 | 06:42 AM
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Here are the ground locations.
Attached Thumbnails Tail light gremlins-w6.jpg   Tail light gremlins-w7.jpg  
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Old Jul 16, 2013 | 06:46 AM
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Thank you. That was the issue, corrosion at the ground stud in the rear cargo area. Oddly, showed zero signs of corrosion, but multimeter showed bad contact, so after cleaning and applying di-electric she is back in business
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