I have a 1993 300E and have an issue with the passenger side tail light. All other lights in the cluster work, I.e. turn signal, brake light, etc. I used a wire tester and there is no power to the lamp. Can someone help me out with where the rear tail light wires come from? I would like to check the power at the source.

Also, does anyone know where to purchase a rheostat? My interior dash and center console lights stopped working as well. Thanks!

Power for left (Driver's)tail lamp from terminal #9 on the External Lamp Failure
Monitoring Unit [N7].

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'84 300SD sold
124.128

A lot of people generally forgo the rheostat if it breaks, and jumper the dial so lights are on 'max bright' considering dash lights are quite dim in this car. Or just do this anyway to get more light. But if they're just out, maybe another fuse to check first.

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Cheers!
Scott McPhee

1987 300D

Replace fuse #3 in the under hood fuse block. They can look good but really be bad. That fuse supplies the power for the all the things you mentioned.
Good luck,
Paul

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84 500 SEL (307,xxx miles)

Also check the metal strips in the taillight housing...over time they loosen with vibration and lose their seating...enough to mess up the connections to the bulbs...

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2009 ML350 (106K) - Family vehicle
2001 CLK430 Cabriolet (80K) - Wife's car
2005 BMW 645CI (138K) - My daily driver
2016 Mustang (32K) - Daughter's car

Thanks for all the helpful replies. I used a current tester on the #3 post and there is no power to this post, nor the #4 post for the fog lights. Before I go tearing apart the fuse box trying to figure out what is wrong down there does anyone have any helpful advise? I have attached a photo of my fuse box and what appear to be relays at the top? (not for sure if that's what they are) Thanks again...

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