Alternator or voltage regulator
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New User
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Alternator or voltage regulator
1976 F350 2wd with a 390.
I tested the voltage at my battery and it's the same with the truck running or turned off. How can I tell if it is a bad alternator or just a bad voltage regulator?
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I tested the voltage at my battery and it's the same with the truck running or turned off. How can I tell if it is a bad alternator or just a bad voltage regulator?
.
Fleet Owner
Joined: Aug 2005
Posts: 23,668
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From: Easton,Ks
Originally Posted by 390
1976 F350 2wd with a 390.
I tested the voltage at my battery and it's the same with the truck running or turned off. How can I tell if it is a bad alternator or just a bad voltage regulator?
I tested the voltage at my battery and it's the same with the truck running or turned off. How can I tell if it is a bad alternator or just a bad voltage regulator?
It should charge with all it’s got as this bypasses the regulator and key.
If it does charge make sure you are getting power on the "S" terminal of the regulator with the key on and that the regulator is well grounded. Also make sure you have 12V on the "A" terminal of the regulator.
Also if it did not charge make sure you have 12V on the BAT. terminal of the alternator.
