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Old 12-31-2007, 06:29 PM
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Join Date: Dec 2007
Posts: 2
no dash, radio, gear shift lights

i have an 88 420 sel. I have replaced the rheostat (dimmer switch) and
have even hard wired it. Still no dash or other common lights
controlled by the rheostat. Have also replaced fuses. Have all other
lights including glove compartment and visor lights ok.
Any other suggestions on this problem. The rheostat controls lights for
console, radio. I have none of those either. Also changed bulbs in dash.
They still will not light up.

Last edited by kniterun21; 01-06-2008 at 09:53 AM. Reason: did not add i have power to post for rheostat
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Old 12-31-2007, 09:25 PM
Gilly's Avatar
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Join Date: Mar 2001
Location: Evansville WI
Posts: 9,616
Seems unlikely, but start checking bulbs. If not that I'd just have to guess a cracked solder joint that feeds power to the dimmer.
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Old 02-10-2008, 08:06 PM
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Join Date: Nov 2005
Location: Nashville, TN
Posts: 1,618
Same problem on a W123

I'm troubleshooting same problem on a W123. What do you mean when you say you hardwired it? Did you hardwired bypassing the rheostat? Did you ever find your problem?
What Would Rudolph Do?
1975 300D, 1975 240D, 1985 300SD, 1997 300D, 2005 E320 , 2006 Toyota Prius
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Old 02-10-2008, 09:28 PM
BMG BMG is offline
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Join Date: Jan 2008
Location: Eastern PA
Posts: 87
Is it possibly a broken or loose ground wire?

Check continuity on one of the wires in question to a different ground location. I believe the grounds for the dash lights are on a bolt bhind the dash itself or perhaps below it.

Brian G.

1994 E320 Wagon with many warts SOLD
1995 E320 Wagon with a beauty mark or two FOR SALE
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