Tested alternator voltage, results...

[supermaxx123 10+ year member]

I have a 93 s10 that seemed to have dimming headlights coming from a 4ch amp. I also noticed my headlights would dim without the amp on then dim and not go with the music. I tested the voltage with the car off = 12.86V

The truck was warm, turned it on = 15V highest 14.78V Lowest

It was jumping around between those, no headlights on.

Turned on my headlights/high beams and turn signal = 14.8V highest, 14.4V lowest

SO now i know why my headlights dim, too much voltage.

Im sure its the regulator, What do you think??

When i rev up the engine it seems to fall to about 14.4V.

I already have another alternator on hand, just wondering if this is an easy fix.

I almost felt like putting a cap to smooth out the voltage JK.

Alternator in it right now-????

Alternator i have on hand- AC Delco 100amp, Stock.

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[terra 5,000+ posts]

So your lights dim due to too much voltage?

 

[jdawg 5,000+ posts]

too much shouldnt make it dim, it does seem high though, problem is that voltage is only half the story, the other half it amperage, you need it load tested

 

[supermaxx123 10+ year member]

So your lights dim due to too much voltage?

15V is too much so when it drops to 14.4 I notice it. Thats what i meant by too much voltage.

 

[JuicyJeff 10+ year member]

they dim when you accelerate too?

 

[justin smith 10+ year member]

too much shouldnt make it dim, it does seem high though, problem is that voltage is only half the story, the other half it amperage, you need it load tested

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