18.3 volts from alternator - Ford Powerstroke Diesel Forum
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post #1 of 8 Old 12-03-2009, 02:38 PM Thread Starter
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18.3 volts from alternator

I was checking the glow plug relay and was getting 14.5 volts at the yellow -brown wired terminal. Checked the battery voltage at 14.5 WTF. The batteries are only one month old but 14.5 is too high . Started the truck and the voltage after the gpr shut off climbed to 18.3 volts. Is this telling me that the voltage reg. is bad? Is it also integrated into the alternator?

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post #2 of 8 Old 12-03-2009, 02:39 PM
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yikes, 18??? seems a little high to me.....

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post #3 of 8 Old 12-03-2009, 03:02 PM Thread Starter
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A month ago when I put in the new batteries , it read 14.65 volts at idle. Bad alternator at 18.3 ?

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post #4 of 8 Old 12-03-2009, 03:13 PM
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Well, obviously you have a good alternator if it can charge at 18.3, however you do have a bad voltage regulator which might be replaceable but I've never done it I usually just change the whole thing. Is is in the alternator somewhere though. Don't run the truck until you get it fixed though, you are risking frying a lot of expensive computers.

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post #5 of 8 Old 12-03-2009, 03:18 PM
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Oh, and 14.65v is a little high but nothing I'd be that concerned about. Ford alternators tend to charge a little high. I'd say 13.5 to 14.5 is the usual range for alternators though.

edit:
The voltage regulator is replaceable but you'll have to take the rear case off of the alternator to get to it. If you have an alternator shop around you I'm sure they could replace it for you for a small fee.

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Last edited by md18; 12-03-2009 at 03:23 PM.
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post #6 of 8 Old 12-03-2009, 03:36 PM Thread Starter
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Thanks for all the info , never thought about the computers.

2000 F250 King Ranch Crew Cab 7.3L LB 4X4 100% home brewed Biodiesel
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post #7 of 8 Old 12-04-2009, 04:52 AM
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Something ain't right!!! I would first double check it with a different multi meter. If it is bad call DB Electrical, best alt you can buy!!!

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post #8 of 8 Old 12-04-2009, 04:21 PM Thread Starter
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Quote:
Originally Posted by NCHornet View Post
Something ain't right!!! I would first double check it with a different multi meter. If it is bad call DB Electrical, best alt you can buy!!!

NCH
Couldn't believe it myself , I used 2 different multimeters , same results

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