1981 malibu gas gauge

[frost1085]

bump

 

[LS6 Tommy]

IIRC, the pink wire should have 9 VDC with the ignition on. The black wire is chassis ground. With the power on, if you disconnect the pink wire at the tank, the gauge should read full. If you ground it the gage should read empty. If it doesn't, the wiring, the guge panel orinted circuit or the gauge is bad. If if the guage & wiring check out, check the sender. If the sender is the correct GM 0-90 ohm unit, you should read 84-88 ohms tank full, somewhere around 40 ohms 1/2 full & 0-2 ohms tank empty at the sender pink wire connector with the pink wire off the connector. I'm betting your pink wire or where it connects to the printed circuit is bad.

Tommy

 

[LS6 Tommy]

IIRC, the pink wire should have 9 VDC with the ignition on. The black wire is chassis ground. With the power on, if you disconnect the pink wire at the tank, the gauge should read full. If you ground it the gauge should read empty. If it doesn't, the wiring, the gauge panel printed circuit sheet or the gauge is bad. If if the guage & wiring check out, check the sender. If the sender is the correct GM 0-90 ohm unit, you should read 84-88 ohms tank full, somewhere around 40 ohms 1/2 full & 0-2 ohms tank empty at the sender pink wire connector with the pink wire off the connector. I'm betting your pink wire or where it connects to the printed circuit sheet is bad.

Tommy

 

[frost1085]

ok thanks for your help ill try the test and let u now what happends thanks again

 

[frost1085]

for some reason now it doesnt do anything besides go to those to spots pictured if i remove the ground still nothin if i remove the pink wire still nothing just goes back to the same spots if i move the needle. they dont sell the guage new or the printed circuit new do they. im hoping its the guage

 

[frost1085]

and i am gettin good power at the pink wire and my ground is also good

 

[LS6 Tommy]

for some reason now it doesnt do anything besides go to those to spots pictured if i remove the ground still nothin if i remove the pink wire still nothing just goes back to the same spots if i move the needle. they dont sell the guage new or the printed circuit new do they. im hoping its the guage

Don't remove the ground, take the pink wire off the sender & it should read full. Then take the pink wire & touch it to ground. It should read empty. If it does that, your sender is bad or it's the wrong one. if the guage does weird things, it's the pink wire, printed circuit or the gauge.

Tommy

 

[frost1085]

ok ill go try this and get back with u

 

[frost1085]

ok i jumped the pink wire to ground and it did go to the empty mark the other gauge stayed the same so im guessing its bad.

 

[frost1085]

and on the pink wire pluged or unplugged it goes to full