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1977 240D 4-speed
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37 Posts
Discussion Starter #1
Me again,
I know that there are many threads on this, but can anyone tell me how to test my gauge with a meter? As well as the wiring from the sending unit? I put in a newish one, completely cleaned and checked, and the same inaccurate gauge (the warning light does come on at @ 4 gallons left/16 used). It's driving me crazy.
 

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2008 C300 Sport
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167 Posts
I found this on a search and perhaps found some resistance in the ground wire between the sender and the gauge (should be zero ohms, but was about 25 ohms) but where is a likely source of the bad ground connection? And, yes, it is a brand new sending unit in the tank.

Help!
 
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