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Old 02-18-2006, 12:34 PM
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Join Date: Feb 2006
Posts: 4
'83 300D Need help with Clock cct board

This is a repost because I got no replies so far and I'm running out of options. I pulled the instrument cluster and the clock in order to replace the 2 capacitors that I heard go bad and I noticed what looks like a resistor next to them that is burned up.
I'm hoping someone with a working clock and cct board can look at the resistor (if that's what it is) and tell me the value, or if you have a schematic that shows the value.
I can't seem to track down a schematic or any information, or even a working or non-working board. Any help would be greatly appreciated.


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Old 02-18-2006, 01:19 PM
Join Date: Mar 2000
Location: Gainesville FL
Posts: 6,844
There will be no schemtics of the internals to a non servicable component. Do you have a picture of the resistor in question? I have boxes of old components.
Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician
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Old 02-18-2006, 01:32 PM
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Join Date: Apr 2004
Location: KY USA
Posts: 2,238
Just a guess, the resistor is a current-limiting/"fusistor" that limits the amount of current to the clock if something goes horribly wrong (like a shorted motor, chip, etc). Six out of seven clocks I've brought back to life worked fine after replacing the two capacitors; I'd just go boneyard another one and fix it. AFAIK all of the "small" mechanisms that go in the third pod along with the tach are functionally the same.
86 560SL
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85 380SL
Daily Driver Project
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Old 02-21-2006, 01:11 PM
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Join Date: Sep 2004
Location: Seattle
Posts: 1,961
I have 'sometimes' been able to read the color bands off of a burned resistor through careful scraping with an exacto knife and using a very good magnifier (loupe) and bright light. But Strife's boneyard advice is probably going to be ultimately correct!


1998 C230 330,000 miles (currently dead of second failed EIS, yours will fail too, turning you into the dealer's personal human cash machine)
1988 F150 144,000 miles (leaks all the colors of the rainbow)
Previous stars: 1981 Brava 210,000 miles, 1978 128 150,000 miles, 1977 B200 Van 175,000 miles, 1972 Vega (great, if rusty, car), 1972 Celica, 1986.5 Supra
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