gas guage?
- Thread starter ISAXDQB
- Start date
88WRANGRED
New member
what are your symptoms, mine just bounces, i guess it goes back to "its a jeep thing" make sure to reset your odometer on fill ups!!
ray
ray
Most of the time it is caused by a bad ground. Check the ground at the tank first.
If that is good you can check the resistances at the gauge -
S to Ground=68-72 ohms
S to I=19-21 ohms
S to A=19-21 ohms
I to A=Zero
I to Ground=49-51 ohms
A to Ground=49-51 ohms
If you can get to the top of your tank where the sending unit is located you can check your gauge by momentarily shorting the output wire (pink) to ground. It should show as full. If it doesn't move you have an open circuit or the gauge is bad.
Check the sending unit by measuring resistance between the round sender post (pink wire) and ground-
73 ohms=Empty
23 ohms=1/2 tank
10 ohms=Full
Good luck!
Scott
If that is good you can check the resistances at the gauge -
S to Ground=68-72 ohms
S to I=19-21 ohms
S to A=19-21 ohms
I to A=Zero
I to Ground=49-51 ohms
A to Ground=49-51 ohms
If you can get to the top of your tank where the sending unit is located you can check your gauge by momentarily shorting the output wire (pink) to ground. It should show as full. If it doesn't move you have an open circuit or the gauge is bad.
Check the sending unit by measuring resistance between the round sender post (pink wire) and ground-
73 ohms=Empty
23 ohms=1/2 tank
10 ohms=Full
Good luck!
Scott
rear window
The temp guage and fuel guage share the same common ground. You should check this connection first, as it is the most likely thing to fail.
Here's some info:
http://www.off-road.com/jeep/tech/electrical/gauges/
Also, you might have to drop the tank to get at the sending unit. Depending on how old your jeep is will dictate if you will have to replace the whole tank or not once you get it off. On mine, i had to replace the whole tank. Turned out to be a bad sending unit, so replacing the whole tank and sending unit solved a world of problems for me.
ISAXDQB said:
The temp guage and fuel guage share the same common ground. You should check this connection first, as it is the most likely thing to fail.
Here's some info:
http://www.off-road.com/jeep/tech/electrical/gauges/
Also, you might have to drop the tank to get at the sending unit. Depending on how old your jeep is will dictate if you will have to replace the whole tank or not once you get it off. On mine, i had to replace the whole tank. Turned out to be a bad sending unit, so replacing the whole tank and sending unit solved a world of problems for me.
Beach_Jeep
New member
Yup, my CJ has the same issues. Thanks for the idea on the fuel gauge. I'll look into that also tonight.
Keep Jeep'n
Keep Jeep'n
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