I changed Alternator and it STILL drops in voltage - Ford Mustang Forums : Corral.net Mustang Forum
 
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post #1 of 6 Old 09-23-2002, 05:38 PM Thread Starter
 
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Angry I changed Alternator and it STILL drops in voltage

Here we go, AGAIN!!
My quick problem is this....
The voltage when idling (hot) would drop to 12.5vdc. When cold it produced 14.6vdc with a new regulator. So I go and change to a NEW alternator and notice that the voltage gauge reads a bit higher then it did. GREAT I fixed it! RIGHT? welll...
As it heats up the "volts" gauge needle dropped down to the "O" and I know that it's around 12-ish vdc cuz that's where it was before when I recorded it with a volt meter. I cleaned the ground strap and still no dice.
I DO know my computer is bad due to a 511 code. I pulled the chip and same deal. DOES THE COMPUTER "control" dash gauge readouts? If so then my computer on order will HOPEFULLY FIX THIS DAMN PROBLEM.

Anyone have any other clues to the charging issues??

94Goezquik is offline  
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post #2 of 6 Old 09-23-2002, 07:15 PM
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you might try upgrading the battery ground, and the wire from the alt. to the battery. Might help a little

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post #3 of 6 Old 09-23-2002, 07:23 PM
 
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Do you have underdrive pullies? If so, then that is the reason for the voltage drop.
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post #4 of 6 Old 09-23-2002, 08:29 PM Thread Starter
 
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No pulleys. The ground looks good. The ground coming off the ground cable from the battery and the ground strap from the block to the frame all were cleaned.
What else could it be?? It charges fine when cool but as it heats up the voltage drops. New alt, and all. I don't understand it!!!!!
Anyone KNOW if the computer has ANYTHING to do with the display gauges??????
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post #5 of 6 Old 09-23-2002, 09:44 PM
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There must be some sort of automotive electrical shop around you. I had a problem with a car of mine that they easily diagnosed and fixed for like $50.

should not have sold my -->1987 Mustang GT T-Top with a few mods

Patiently looking for a fox GT, must be 5 speed
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post #6 of 6 Old 09-24-2002, 12:01 AM
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12.5 v at hot engine idle maybe ok,what is it reading at 1500 rpm?If it is ok say 13.5 to 14.2v at 1500 rpm then your charging system is fine.
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