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Unread 04-22-2010, 08:50 AM   #1
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1988 YJ Wrangler 
Join Date: Apr 2009
Location: Wichita
Posts: 62
Fuel Gauge Wiring

I know this topic has been beaten to death, but I've searched all over and can't seem to find a helpful wiring diagram.

This is probably a coincidence, but I just installed a CB and removed the rear track bar. At the same time, my fuel gauge went to full, and recently driving it now reads at empty. I can only assume it is an unrelated electrical issue because I attached the CB to the stereo wiring (Don't have a stereo).

To troubleshoot so far, I removed the instrument cluster and cleaned all the contacts, including the ones on the electrical connector. This fixed my oil pressure gauge issue finally, but didn't fix the fuel gauge. Before I start dropping the tank, I wanted to check the Ohms on the wire leading to the fuel gauge, but I don't know which wire it is on the connector. Can someone please shed some light so I can test the sending unit in the tank without all the ugliness?

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Unread 04-22-2010, 09:14 AM   #2
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1989 YJ Wrangler 
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I would go back by the rear track bar and make sure you did not smack the wiring harness back there. Unplug the coupler and check the connections - DO NOT TOUCH ANYTHING UNTIL YOU DISCONNECT THE BATTERY FIRST.
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Unread 04-22-2010, 10:32 AM   #3
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go to the back of the jeep on the driver side, inside the frame at the top of the tank you will see the sender/pump harness. disconnect that. the center wire (gray or brown) is the one you will need to check. put an ohm meter on that wire and on a clean ground. your factory resistance is 0 ohms empty 88 ohms full. also check to make sure the ground to the tank is good.
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Unread 04-22-2010, 01:16 PM   #4
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1988 YJ Wrangler 
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Well I'm not getting any Ohm readings from the wires in the harness, so it looks like I'm going to need a tank drop.
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Unread 04-22-2010, 05:40 PM   #5
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1990 YJ Wrangler 
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Good luck with that!

I did that not too long ago, its a pain in the arse!

While you're at it, replace the fuel sock inside the tank on the sender unit. Mine smelt of a sewer. BLEH!
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