Alternator question. 12.7 volts?? - Ford Powerstroke Diesel Forum
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Old 11-01-2011, 01:41 PM
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Alternator question. 12.7 volts??

Hi, I currently have a e350 with the psd... It barely started this morning. After driving around for about 30 mins it has started up just fine. I took it to a shop by my house and they tested the system and told me that I needed a new alternator because the batteries are charged but the alternator only is charging with 12.7 volts and not 14.7. Are they just trying to sell me an alternator???? Any advice would be appreciated....
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Old 11-01-2011, 10:11 PM
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They are correct in their diagnoses. DC Power is the best alternator you can buy. The first one I replaced was a NAPA brand that lasted about a year and a half I decided never again. I have the DC Power 270amp alternator I run a high amp air compressor with it, its an excellent setup.
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Old 11-01-2011, 10:17 PM
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Not too fast.........Check the alternator with a VOM at the battery first. However, on a 6.0 the alternator will not charge directly after a start-up, keep the gauge on the battery for at least a FULL minute, there is a delay built into the regulator circuit. Chances are your batteries are bad. Since the truck started fine after a drive, it shows the charging system is working................
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Old 11-01-2011, 11:39 PM
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Thank you both for the replies.... After pulling both of the batteries out and re testing them the mechanic apologized and said that one of the batteries was bad..... I ended up replacing them both

Thanks again for the help guys!
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