It was the logic ground circuit!!!!
01-22-2011, 04:34 PM
#1
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Location: Pleasant Hill ca.
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Year: 1991
Model: Cherokee
Engine: 4.0l
It was the logic ground circuit!!!!
I had a speedo, tach and fuel gauge go out all at once. It turned out to be a open in the logic ground circuit. a quick jump to ground and I'm back on the road. 
thanks to those who tried to help.
thanks to those who tried to help.
01-23-2011, 03:37 PM
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Year: 1991
Model: Cherokee
Engine: 4.0l
Logic circuit
the logic ground circuit provides a ground for the speedo, tach and fuel gauge. Its the green and black wire found in the B2 slot of the black/blue connector at the back of the I/P cluster. I spliced into the green and black wire and grounded it at the fuse block under the dash.
This is a temp repair but will work until I can find out if the ECM is responsible for the circuit or not.
This is a temp repair but will work until I can find out if the ECM is responsible for the circuit or not.
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