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  #31  
Old 02-02-2020, 12:38 AM
vwnate1's Avatar
Diesel Dandy
 
Join Date: Nov 2005
Location: Sunny So. Cal. !
Posts: 6,971
Post Fuel Gauge Testing

So ;

Remove the sender, connect it and tip it back and forth ~ the gauge should follow and the low fuel lamp come on right about when the needle reaches the 'R' .

This should tell you if the sender or gauge or wiring is bad .

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-Nate
1982 240D 407,XXX miles
Ignorance is the mother of suspicion and fear is the father

I did then what I knew how to do ~ now that I know better I do better
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  #32  
Old 07-09-2022, 05:21 PM
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Join Date: May 2022
Location: Mineral, VA
Posts: 1
85 300d turbo diesel. fuel gauge was working. I replaced multi purpose relay & gauge quit working. Switch relay back to original relay & gauge still not working. Could the relay cause gauge to stop working like that? Does anyone have electrical diagram for this car?
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  #33  
Old 07-09-2022, 07:29 PM
vwnate1's Avatar
Diesel Dandy
 
Join Date: Nov 2005
Location: Sunny So. Cal. !
Posts: 6,971
Fuel Gauge Testing

Begin by testing the fuses in the fuse box with a test light not a meter .

If you look at them and says 'they all look fine to me' stop, you're never going to fix it unless you do the actual work those crazy Mechanics want $50 / hour to do .

IMO, I'd automatically replace any silver or gray colored strip fuses because they're essentially worthless due to age .

It takes time to find the correct copper strip fuses but they're out there .

You shouldn't need a wiring diagram .

Yes, I have the factory diagrams but they're HUGE and are circuit diagrams, not overly helpful in figuring out what's what on the actual car .

I have no idea how to scan these and will soon be selling off or throwing out my large collection of factory shop manuals, I only need a few to cover my later production cars .

No one wants to buy them any where at any price and no, I'm not going to give then away for $20 each when I paid hundreds after searching for years to get them .

If there's any technical book store in the L.A. basin area , tell me and I'll sell them as one big lot along with many other brands manuals part & service, owner's booklets etc. but NO DIRECT SALES .

__________________
-Nate
1982 240D 407,XXX miles
Ignorance is the mother of suspicion and fear is the father

I did then what I knew how to do ~ now that I know better I do better
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