ammeter guage spiking

[doug glenn]

patient is 65 satellite big block. Has been upgraded with dual field alt. and electronic voltage regulator. Recently noticed ammeter spiking to full charge? for maybe 1 minute then dropping back to normal. When this happens tach reading drops to less than half correct rpm. At first it only happened occasionally, last sunday took a 100 mile round trip & it started spiking more often(a lot). Also lost a turn signal bulb. I'm leaning toward voltage regulator going bad. Had park lights on on the way back, then realized I had lost turn signal. What you guys think?

 

[mopar 3 B]

Maybe a field wire shorting?

 

[miller]

Might also get a hand on the backside of the gauge, and check for loose connections.

 

[Nacho-RT74]

Might also get a hand on the backside of the gauge, and check for loose connections.

:headbang:

or loosen conections anywhere ( bulkhead too )

 

[doug glenn]

think I found it. tach was grounded at starter relay. both had terrible grounds. will continue thru system checking for potential problems. thanks

 

[mopar 3 B]

That is almost funny just about an all metal car and tack ground is in the engine compartment.

 

[dodge1972]

Double check the ground strap between the fire wall and the engine block. Make sure connections have no paint same is true for engine ground points.