voltmeter oscillation

[cigars]

just had my alternator and belt replaced 3 weeks ago. took a trip of about 4 hours the other day and noticed that at highway speed by voltmeter is bouncing about 1/8". My interior lights are doing the same also. Bady alternator, belt, ground?

[Yukon04]

Sounds like the voltage regulator on the alternator is defective. Take it back and have it checked or put a voltmeter on the output side and check it. It should be stable.

[Bish]

Sounds like the voltage regulator on the alternator is defective.  Take it back and have it checked or put a voltmeter on the output side and check it.  It should be stable.

 

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Agreed. Both of my alternators failed the same way and replacement cured them. I now have a 200Amp from Alterstart that has been working great for about a year.

[71GMC_3/4T]

I agree also. Change it out soon before it overvolts something and takes it out! That could get a whole lot more expensive real fast...

[cigars]

I agree also.  Change it out soon before it overvolts something and takes it out!  That could get a whole lot more expensive real fast...

 

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thanks all, will do asap