The 1947 - Present Chevrolet & GMC Truck Message Board Network - 67-72 Chevy Truck fuel gauge diagnostics 101

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The 1947 - Present Chevrolet & GMC Truck Message Board Network (https://67-72chevytrucks.com/vboard/index.php)

- Electrical (https://67-72chevytrucks.com/vboard/forumdisplay.php?f=64)

- - 67-72 Chevy Truck fuel gauge diagnostics 101 (https://67-72chevytrucks.com/vboard/showthread.php?t=640615)

bamabronc

04-18-2020 02:36 PM

Re: 67-72 Chevy Truck fuel gauge diagnostics 101

Quote:

Originally Posted by bamabronc (Post 8719368)

More info. With the gauge outside of the cluster and hooked up, it works. I’m thinking it must be something with how I have the resistor on or the wiring coming into the cluster. Does anyone know what the readings should be on each wire at the plug?

Also, feed wire at plug is 90 ohm, but once plugged in it goes to 36 ohms.

bamabronc

04-18-2020 02:40 PM

Re: 67-72 Chevy Truck fuel gauge diagnostics 101

Quote:

Originally Posted by 67 Burb (Post 8719431)

OK. I missed your last post as I was posting mine. Now you know that the sender is OK and the gauge works out of the dash unit, make sure the gauge cluster is well grounded.

Where did you test the sender from? At the sender or from under the dash?

I have tested the sender both in the tank and out. Ohms moved as it should while moving the float up and down. The tank is full and reading 90 ohms. At the dash plug and tank both read 90 before plugging up to the cluster

It’s weird. Seems to work until I connect the printed circuit

67 Burb

04-18-2020 03:38 PM

Re: 67-72 Chevy Truck fuel gauge diagnostics 101

Quote:

Originally Posted by bamabronc (Post 8719441)

Also, feed wire at plug is 90 ohm, but once plugged in it goes to 36 ohms.

Yes, once you plug it in, you are introducing more circuitry into the ohm measurement.

Run a wire from the ground stud on the back of the gauge to a good ground.

67 Burb

04-18-2020 03:45 PM

Re: 67-72 Chevy Truck fuel gauge diagnostics 101

1 Attachment(s)

The one I have the black jumper on.

bamabronc

04-18-2020 03:51 PM

Re: 67-72 Chevy Truck fuel gauge diagnostics 101

Tried grounding stud with a wire and no change while harness plugged in

67 Burb

04-18-2020 04:02 PM

Re: 67-72 Chevy Truck fuel gauge diagnostics 101

I'm stumped. All seems to be OK, but still it doesn't work. :banghead:

bamabronc

04-19-2020 07:11 PM

Re: 67-72 Chevy Truck fuel gauge diagnostics 101

Here is a great YouTube explanation on fuel gauges I thought I would share. It covers the resistors and such. https://youtu.be/bVT2Jh_p02A

57taskforce

07-03-2020 08:17 PM

Re: 67-72 Chevy Truck fuel gauge diagnostics 101

I just wanted to thank Vettevet and Tbone for this great thread. I had to replace my gauge resistor but thanks to this thread I was able to get my gauge working again. You guys are awesome.

TBONE1964

07-03-2020 11:04 PM

Re: 67-72 Chevy Truck fuel gauge diagnostics 101

Quote:

Originally Posted by 57taskforce (Post 8768445)

I just wanted to thank Vettevet and Tbone for this great thread. I had to replace my gauge resistor but thanks to this thread I was able to get my gauge working again. You guys are awesome.

Glad the information provided has helped you. It's always a pleasure to help .

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