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2007 Ford Focus/ for dealership replaced alternator (w/a new ford factory one) due to bad voltage regulator on 5-22-09.4 days ago car started doing same thing. How can I check the voltage regulator to see if it’s bad and what causes them to go out?


7/10/2009

2007 Ford Focus/ for dealership replaced alternator (w/a new ford factory one) due to bad voltage regulator on 5-22-09.4 days ago car started doing same thing. How can I check the voltage regulator to see if it’s bad and what causes them to go out?
 
It is not uncommon for an alternator to be bad even though it is “new”. You can take a simple volt meter to the battery and check the voltage output. You should show 13.5 volts at idle.  

I do not know the way to check just the regulator since it is built into the alternator.

The cause of them to go bad is usually complicated but there is a short and or back feed into the alternator. If you have aftermarket stereo equipment with a high-powered amp it can cause this problem as well.

Gerald Wheelus
Edgewood Auto Parts #253
Edgewood, Texas














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