Amp Gauge gone wacko?

[Andrew S.]

Recently after not having driven my car for a few weeks, I got in and started the beast up and noticed that the amp gauge needle initially jumped up then dropped completely down to -40. Since then it barely moves when I run the car, staying at -40. I had the alternator tested and it shows to be putting out 13-14 volts. Do I need to have the amperage output also tested? The guy at the parts shop did not offer that test. Any help is appreciated.
Andy

[William C.]

Re: Amp Gauge gone wacko?

If it does not return to center "0" with the key off, you need a new amp gauge. Before you install the new gauge, have the electrical system checked for a short in the sending wire that activates the ammeter. You did not mention the year, but in the '63 up cars the ammeter is actually a sensitive voltmeter that infers amperage by measuring voltage drop thru the main electrical feed wire in the engine compartment.