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post #1 of (permalink) Old 01-20-2001, 03:43 AM
abrrox
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Jumpy voltage needle

Is my voltage regulator on the way out? The needle stays dead centre at idle but give it gas and it usually swings to the right a notch or notch and a half. Once in a while it goes half a notch to the left. The alternator, belt and battery are literally a week old. All Ford parts. It's an 88 302? If it's the regulator, how much is an aftermarket part?

Thanks!

Brad


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post #2 of (permalink) Old 01-20-2001, 08:51 AM
 
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Re: Jumpy voltage needle

All new charging system huh! Maybe one of those things are bad . I have gotten a bad reman alternator before. Could be voltage reg. I haven't replaced one don't know price.I would check the battery , alt. test them see if there good then you could rule them out. Maybe check belt tension. maybe too much slack not charging good?! but if it were that then it would be worse at idle. Hum, I would check the new parts first. Let us know wasssup!

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post #3 of (permalink) Old 01-20-2001, 03:20 PM
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Re: Jumpy voltage needle

It's gotta be in the alt/voltage regulator. When the engine is running, the battery has little effect on voltage unless you are pulling more than the alt can put out. If the only thing that makes the needle move is throttle, I'd say it's the alternator. If ANY load (like blinkers or hazards) makes it move, I'd say VR. The shop where I used to work only charged $10 to check the batt, alt, vr, & starter and it was a drive-up service; only 5-10 minutes.

Steve
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post #4 of (permalink) Old 01-20-2001, 06:49 PM
abrrox
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Re: Jumpy voltage needle

Took it to Ford today. After going through all the usual, "Is it a Ford part, did we put it in, yada yada yada?" they looked at the truck. They said that the voltage needle sitting in the green (anywhere in the green) is okay. However, I started the truck and the needle jumped two notches to the right. They said it's fine. I turned on the heater and lights and the needle moved slightly to the left. They still said it's fine. Then I turned everything off, pressed on the brake, turned on the heater and lights again and the needle jumped back past centre and way to the left. The guy just looked at me and said, "Book it in."

Seems the alternator has the voltage regulator built into it - something I didn't know. So they have to replace it all as one piece.

Gotta say the service at this particular dealership is good. I'll let you guys know what happens Monday.

Brad


post #5 of (permalink) Old 01-20-2001, 09:40 PM
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Re: Jumpy voltage needle

It's an internal voltage regulator, but it CAN be replaced separately.

Steve
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post #6 of (permalink) Old 03-11-2003, 02:39 PM
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Re: Jumpy voltage needle

I have the same problem with my 1990 F150 Lariat 350w I took it in and they said the alternator was fine AVR test charge system 13.8v @ 62 amps. So they repleaced the battery. But the needle still jumps to the left when idling as well if the heater is turned on, when I rev it up to 1000 rpm the meter jumps back to the middle. Help
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