Voltage issue on an 89

[Lincv8]

Coming home from a car show last week on a very hot day, I turned on the A/C.

Worked fine and then I notice a 11 volt reading on  dash volt meter. shut off A/c and it went back to 12 volts. Has always read 12 volts while normal operation.

Noticed same with lights on.

Did a reading on battery, with multi meter, not running, read 12.6 volts .

Started car, read 14.2 on multimeter at idle. Gauge in car at 12 volts.

Turned on lights and A/C while idling, gauge in car dropped to 11 volts, multimeter read 14.0.

Appears charging system works fine, never had any starting issues, so probably bad gauge?

If so I can ignore till I have a need to tear into dash which needs a few light bulbs.

Opinions??

 

Dan

[IndyJimW]

If your Avanti is like my  1987 Avanti it has several hot wires supplying the interior. I have seen problems with these wires having loose contacts at the firewall plug. I would start there.

 

Good luck,

Jim Wood