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  #1  
Old 12-18-2010, 03:32 PM
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W126 dash resistors, pot - need help

In an attempt to get my fuel gauge working right I need the resister value and the pot size in the cluster. Anyone have a spare cluster laying around that could look to see what is there?

I need to order a bunch of capacitors for another project, so I may as well order these parts. But frankly I dont feel like taking the dash apart again!

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Old 03-08-2011, 08:51 PM
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Bump! Anyone have a spare they can open and look at?
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Old 03-08-2011, 09:03 PM
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I happen to have one right in front of me.

The resistor for fuel gauge is marked 68R 1096. The pot is stamped 326197. Hopefully that is what you need. I'm not a electronics expert so those may not be the ID numbers you are looking for.
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Last edited by JohnM.; 03-08-2011 at 09:14 PM.
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Old 03-08-2011, 10:40 PM
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68R = 68 ohms which sounds right
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Old 03-08-2011, 10:41 PM
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Well what I really need is the color code bands on the resistors. There is also a gold or silver band on one end. These should big grey ones that are mounted very high, no flush with the board. There should be two of them, if memory serves, next to the pot.
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Old 03-08-2011, 10:47 PM
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edit:

If its a 68R, then I think the bands would be BLUE/GREY/BLACK/GOLD.

Look right?
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Old 03-08-2011, 11:01 PM
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And given the "burnt" look of this area on the backside of the board I have seen and other have reported, I think I will try 2 watt resistors. I think the stock at 0.5 watt and just dont handle the load and are being heat baked.
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Old 03-08-2011, 11:53 PM
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Fuel gauge is from a first year W126 (1981). The resistors are not color banded at all like you typically see, and thats how you decode them, I know that much. These resistors are a solid gray color, however.
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Old 03-09-2011, 07:34 PM
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http://wiki.xtronics.com/index.php/Resistor_Codes
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1985 300D 198K sold
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1992 940T

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Old 03-15-2011, 06:04 PM
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Took mine apart. 68 indeed. Pot is 150k, but I can not find an exact replacement. Ordered resistors in 1w, 2w and 3watt variations.
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Old 03-16-2011, 02:23 AM
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150k sounds very very high for a dimmer pot. Are you sure the PO didnt just stick something in there?
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1985 300D 198K sold
1982 300D 202K
1989 300E 125K
1992 940T

"If you dont have time to do it safely, you dont have time to do it"

"The democracy will cease to exist when you take away from those who are willing to work and give to those who would not."
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  #12  
Old 03-17-2011, 02:44 PM
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I will check again, but I am pretty sure it was 150k. Its the "fine tuning" pot that adjusts the full/empty range - at least that is my understanding. Looks like it is/was original.

I am only replacing resistors first, then I will move onto the pot if needed.

But I will check my reference photos again and post if I was wrong about 150k.

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