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  #1  
Old 10-26-2009, 10:25 AM
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Location: Chelsea, MI
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Some help please - 87 300TDT consol lighting issue

I am doing some repairs on my sonís 87 300TDT and have come up against one issue I just cannot seem to solve. Not one of the center consol lights work including the window button area. All the various switches work but no lights. I have the instrument cluster pulled and everything out of the consol and cannot find a wire issue so far. The lights in the cluster work and the dimmer switch is working fine. I borrowed an illumination control unit from a friend but that is not the issue either. Anyone have suggestions? Has anyone experienced a similar problem in the past?

Thanks
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86 300SDL - 207K
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  #2  
Old 10-26-2009, 03:11 PM
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Your car has an electronic relay behind the instrument cluster that controls all those lamps. The cluster lamps are controlled directly by the rheostat in the cluster but all the other lamps go through this "amplifier" so the total current load doesn't burn out the rheostat.

The "instrument illumination control unit" is N40 in Mercedes schematics and the part number is 004 545 08 32. It is pricey, a junkyard unit would be a good alternative. You have to pull the cluster and then undo two screws to remove a bracket holding N40 and N2/4 (the "warning module"). N40 is the one on the right.

It is also possible that Fuse 9 is blown; it provides power to N40. Interestingly, my '87 has a bad wire to N40 and it gets no power; I rewired it to the clock circuit on the same fuse.

BTW, your car is a "TD," not a "TDT."

Jeremy
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"Buster" in the '95

Our all-biodiesel family
1995 E300D (W124) . .239,000 miles My car
1996 E300D (W210) . .313,000 miles Wife's car
Santa Rosa population 170,685 (2012)
Total. . . . . . . . . . . . 722,685
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  #3  
Old 10-26-2009, 04:46 PM
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Thanks Jeremy

I actually have tried the borrowed illumination control unit but only to the plug without mounting it. So I will pull the original unit and take a look at the rear connections. I appreciate the answer. I also need to make sure the power is being transferred although I know the plug has power to it via a meter test.

I know it is referred to as a TD and also have seen TDT. My tendency to call it a TDT is the fact that my son bought it from the original owner in Arkansas and that title had TDT on it. May have just been a local error. Whatever, we both know what I am talking about in the description.

Frank
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old goat

86 300SDL - 207K
84 300DT - 298K - sold
78 450SL - 97K
61 Porsche - rare T-5 Karmann Hardtop - NO, NOT a Karmann Ghia
99 Suburban 4x4 - 247K all original, the family donkey
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  #4  
Old 10-29-2009, 08:38 AM
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Found the answer

The answer is the little red cluster fuse. Although it registered voltage passing through it, the fuse was so near to being shot that it could not carry enough amps to light a 2 watt bulb. So now I will have to find one. Anyone know the amp rating for that fuse or where to buy one?

Thanks, Frank
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old goat

86 300SDL - 207K
84 300DT - 298K - sold
78 450SL - 97K
61 Porsche - rare T-5 Karmann Hardtop - NO, NOT a Karmann Ghia
99 Suburban 4x4 - 247K all original, the family donkey
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  #5  
Old 10-29-2009, 10:41 AM
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I have some over in Holland, how far away is Chelsea?
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  #6  
Old 10-29-2009, 11:05 AM
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Chelsea is about 15 miles west of Ann Arbor so quite a way from Holland. I would be glad to reimburse you for the fuse plus shipping if that would work.
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old goat

86 300SDL - 207K
84 300DT - 298K - sold
78 450SL - 97K
61 Porsche - rare T-5 Karmann Hardtop - NO, NOT a Karmann Ghia
99 Suburban 4x4 - 247K all original, the family donkey
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  #7  
Old 10-29-2009, 11:05 AM
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Don't worry about the rogue T. It's a running gag on the forum.

For the record on my insurance card I drive a 1985 Mercedes Benz 300DT :p
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Quote:
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Going back to the original post: "Can you get the vac to blow instead?" No. Vacuums are low pressure so they by nature "suck" and nature abhors them.
1984 380SL
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  #8  
Old 10-29-2009, 11:12 AM
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Interesting. That fuse appears on later 124s -- my '87 didn't come with one but when I was doing an upgrade I switched to a later cluster and the fuse came along. I always wondered what it was for. BTW, I also have spares but Jeff is a lot closer.

Jeremy
__________________

"Buster" in the '95

Our all-biodiesel family
1995 E300D (W124) . .239,000 miles My car
1996 E300D (W210) . .313,000 miles Wife's car
Santa Rosa population 170,685 (2012)
Total. . . . . . . . . . . . 722,685
"Oh lord won't you buy me a Mercedes Benz."
-- Janis Joplin, October 1, 1970
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  #9  
Old 10-29-2009, 10:17 PM
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Quote:
Originally Posted by old goat View Post
Chelsea is about 15 miles west of Ann Arbor so quite a way from Holland. I would be glad to reimburse you for the fuse plus shipping if that would work.
PM or email me your address, I'll happily give you one via USPS.
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  #10  
Old 10-30-2009, 06:12 AM
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I just sent an e-mail via your contact info on this site.

Thanks, Frank
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old goat

86 300SDL - 207K
84 300DT - 298K - sold
78 450SL - 97K
61 Porsche - rare T-5 Karmann Hardtop - NO, NOT a Karmann Ghia
99 Suburban 4x4 - 247K all original, the family donkey
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