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  #1  
Old 08-27-2011, 12:46 PM
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W115 300D temp resistor - secret information

Hey Everyone,

I really need a piece of information I have not been able to find anywhere. I have scoured the internet and sent a few emails to suppliers.

The temp gauge on a 300D W115 has a resistor. Mine is blown so the numbers have been eradicated. I need to replace the resistor but can't until I know those numbers.

One repair shop local to me said he knew, but because it was his little secret, he wouldn't tell me.

Does anybody know, or can anybody check theirs?

Thanks a million.

Mark
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Old 08-27-2011, 10:25 PM
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Does the resistor have any color banding?
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Old 08-28-2011, 08:43 PM
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No it does not. These resisting have numbers.
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Old 08-30-2011, 09:35 AM
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If you can point me to where this resistor is, I can try to take a look at my '76 w115 300D...

-Dan

--
1976 w115 300D
1985 w123 300TD
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  #5  
Old 08-30-2011, 08:16 PM
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Thanks dan, the resistor is on the back of the temp gauge. But you would have to pull out the instrument cluster. That is easy. It just pulls out, but then you'd have to disconnect the odometer cable, a couple of leads that pull out, the main electrical connection and the oil pressure cable and the glow plug light. .

LOL. I doubt you want to do that. It's actually quite quick, but that is what you'd have to do to remove the instrument cluster.
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Old 09-01-2011, 10:36 AM
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I got a box of spare parts with my 300D and there is a cluster in there. I remembered on the way out the door this morning and ran down to the basement to check.

Sure enough, I saw the resistor on the back of the fuel gauge, but it has no markings on it. It appears to have been hot over the years (I guess that's what these things do) but not burnt.

When I get home, I'll snip one side and measure with an ohm meter and post here.

-Dan
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1976 w115 300D 4-speed conversion!!
1985 w123 300TD 4-speed conversion!!

Non-Mercedes old stuff:
1941 Buick Special (Straight 8!)
1946 Luscombe 8a
1947 Willys CJ2a
1950 Chevrolet 4400 dump truck
1954 Chevrolet 3600 3/4 ton
1954 Cessna 195B
1955 John Deere model 40
1991 Ford Taurus SHO
2013 Jetta SportWagen TDI 6-speed (I sold out...
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  #7  
Old 09-02-2011, 11:11 AM
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68 ohms

I took a look in better light and the resistor on the back of the fuel gauge is indeed marked "68 ohms," picture attached.

Hope this helps.

-Dan
Attached Thumbnails
W115 300D temp resistor - secret information-w115-fuel-resistor.jpg  
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1976 w115 300D 4-speed conversion!!
1985 w123 300TD 4-speed conversion!!

Non-Mercedes old stuff:
1941 Buick Special (Straight 8!)
1946 Luscombe 8a
1947 Willys CJ2a
1950 Chevrolet 4400 dump truck
1954 Chevrolet 3600 3/4 ton
1954 Cessna 195B
1955 John Deere model 40
1991 Ford Taurus SHO
2013 Jetta SportWagen TDI 6-speed (I sold out...
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  #8  
Old 09-02-2011, 08:18 PM
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Thanks Dan, sorry for the delay. I forget to check this thread in Vintage. I'm always over at Diesel.

So thanks for confirming that! That means a lot.

Does it say wattage or just ohms?
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Old 09-03-2011, 10:51 AM
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So I went to take a look again and realized the one I was looking at was on the temp gauge. So, I clipped one end of the one on the fuel gauge (no readable value) and measured with my digital ohm meter. Measures 70 ohms ... so although I was looking at the wrong one, it appears that they are the same resistor.

Take a look at the pic ... as long as you use one that's about as big it should be fine. Too small wattage (size) and it can't dissipate the heat ... too much wattage is never a problem, but size will get to be an issue.

Hope this helps.

-Dan
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1976 w115 300D 4-speed conversion!!
1985 w123 300TD 4-speed conversion!!

Non-Mercedes old stuff:
1941 Buick Special (Straight 8!)
1946 Luscombe 8a
1947 Willys CJ2a
1950 Chevrolet 4400 dump truck
1954 Chevrolet 3600 3/4 ton
1954 Cessna 195B
1955 John Deere model 40
1991 Ford Taurus SHO
2013 Jetta SportWagen TDI 6-speed (I sold out...
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