Voltage falls off...

[Geoff1200]

Just picked up a 72 Cuda 340 and noticed the voltage drops and the car starts missing. Happened twice in 10 miles. Without randomly replacing parts and hoping to cure the issue, anyone have some insight they wish to share?

A quick inspection didn't reveal anything amiss, wiring is clean n' tight, grounds are good, advice welcome.

 

[hpjunke]

sounds like your voltage regulator is not doing its job . I remember when i alternator was going south it was making my lights dim and would run like s#it !

 

[nqkjw]

Bad ammeter connections can do the same.
Just join them onto one terminal.
Ammeter won't work but just fit a voltmeter.

 

[Chryco Psycho]

if the pulley is too big on the alt it may be turning to slow at idle

 

[Geoff1200]

Adv.Auto tested alt. and said it was bad, replaced with a 65 amp and still have issues...not as bad thou. Will replace regulator and hope for the best...

Don't have an amp guage, just voltage, car was rewired during older resto, no horns, windshield washer, very clean/spartan eng. bay. Haven't figured how to post pic's ...

 

[Chryco Psycho]

at the bottom of the window when you click reply not the quick reply window you will see an attach files box to add a picture

 

[Geoff1200]

at the bottom of the window when you click reply not the quick reply window you will see an attach files box to add a picture

??? Maybe I'm dumb...I don't see it...

Huummm, is this it???

 

[burntorange70]

Nice car! Them wiring gremlins sure to suck to chase down. Mabby try using a tester at different spots and see what you come up with. One area to look at is the bulk head connector. Good luck.

 

[Chryco Psycho]

Umm that might be it