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Name : Brandon
Age : 26
Location : Macomb, Michigan
Joined : 2008-12-02
Post Count : 84
Merit : 0

PostSubject: voltage drop???   Mon Jan 11, 2010 6:28 pm

today my voltmeter was reading 15 volts! i have stock electrial system, but i did add a longer battery post for my amp. but im when it is cold out it some times drops from 14.4v down to 12 when i am stopped at a stop light, then recharges again to 14.4 then somtimes moves and stays at 14.8-14.9 and rarely hits 15v..

whats the problem?? is it the alternator?
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Name : Mark
Location : West Salem, Oregon... FINALLY
Joined : 2009-04-09
Post Count : 3014
Merit : 100

PostSubject: Re: voltage drop???   Mon Jan 11, 2010 6:42 pm

On CS-series alternators, 'normal' idle voltage can be as low as 12.5 volts, and in general, 15 volts is also within normal range... When you say you're stopped at a light, is this with a massive audio system running?
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Name :
Location : Finger Lakes of New York State
Joined : 2007-05-31
Post Count : 6698
Merit : 123

PostSubject: Re: voltage drop???   Mon Jan 11, 2010 7:02 pm

Brandon: If you added an amp, your electrical system is no longer 'stock.'

Many places (GM dealers, Goodyear, FIrestone and other auto centers, some auto parts stores) have equipment to test alternators. Probably the quickets thing to do is go to one and ask for test. You are hoping they will use a tester that can simulate heavy and variable loads, as well as poinpoint the problem, such as this one:


...or larger. The tester should be set up to tell you if the output is sufficient, and should be able to test the diodes in teh regulator.

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Name : Derek
Age : 45
Location : Reading, MA
Joined : 2007-01-31
Post Count : 7716
Merit : 109

PostSubject: Re: voltage drop???   Mon Jan 11, 2010 10:34 pm

When was it reading 15 volts? It will run higher after a cold start, when the most energy was used up. Did it stay there? Where is your voltmeter hooked up to?
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Name : terrance
Age : 29
Location : San Antonio, Texas
Joined : 2015-04-17
Post Count : 85
Merit : 0

PostSubject: Re: voltage drop???   Today at 1:21 pm

I know its an old thread but, I can't start a new one for some odd reason. I'm in dire need of help! My engine to chassis negative post bold broke off into the chassis, and I can't for the life of me remove it! Is there another location that I could use or anyone have ANY ideas!?!? Thanks in advance.
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