fix volt gauge since new alt is in

[RootBreaker]

Ok so for a VERY long time like since 1993 my volt gauge in my truck reads 9volts wich is right next to the red zone....

now I have replaced the gauge and it still says the same thing...
I have put the 140 amp alt in my truck and my truck reads 18.1v at the battery.... but my gauge STILL reads approximately 9v...

what could be causing this? i would like to get my gauge working correctly....

 

[mr_clean]

Only thing I can think of is maybe a dirty ground. If you getting 18 volts at the battery and there hasn't been any change in the volt gauge, I'd look at grounds and bad connections...

Doesn't 18 volts at the batt seem high? I know they run 15 or so pretty common, but 18 seems high to me. That's a 50% increase...

Scott

 

[pauly383]

Possibly bad ceramic resistor on back of gauge , fixed all my gauges every time by replacing those with some off other gauges .

Possible

 

[R72K5]

14.8

 

[Fierospeeder]

if you read my other thread. Your voltage is way to high. Max is 15.2 usually it depends on the temperature.