Im having a problem with the voltage on my car. Itll push 14.4v at idle with everything on except the a/c. As soon as I turn the a/c on the voltage goes down too 12v and everything dim's. What would cause such a issue? Both the alternator and battery are known good!
Alternator could be getting old? I know this was an issue with the Foxes, because their, I believe, 95 amp alternator. Our cars had a 130 amp in them stock I'm pretty sure.
There are too many variables at idle.
What is the system voltage at 2K RPM with a full load? Be sure you're using a DMM (the stock gauge is not accurate enough for diagnostics).
If the voltage is fine above idle, it probably just means the alt isn't spinning fast enough at idle for one reason or another. Variables include underdrive pulleys, idle speed, alternator pulley diameter, etc.
There are too many variables at idle.
What is the system voltage at 2K RPM with a full load? Be sure you're using a DMM (the stock gauge is not accurate enough for diagnostics).
If the voltage is fine above idle, it probably just means the alt isn't spinning fast enough at idle for one reason or another. Variables include underdrive pulleys, idle speed, alternator pulley diameter, etc.
I already posted a response on corral for this issue, but I have to ask, what is the diameter of the alternator pulley you are using? Some replacement alternators have a larger pulley than a stock Mustang pulley.
I already posted a response on corral for this issue, but I have to ask, what is the diameter of the alternator pulley you are using? Some replacement alternators have a larger pulley than a stock Mustang pulley.