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Alternator Voltage
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Picture of jsloan
posted
I decided to put a meter on my alternator today. I had an issue where I was not getting any charge, only to discover that the alternator wasn't plugged in. After plugging in the exciter plug, the alternator made loud noises at which point I discovered that the belt was shot. I then replaced the belt to find tat the previous owners had bypassed the smog pump pulley and didn't quite have clearance for the belt. I then removed the pulley, tightened the belt and cranked her up.
The on-dash volt meter jumped from the lower white line to the upper white line. When I just measured the voltage at the battery, I am getting 14.8 - 15V. Do I have voltage regulator problems?

Oh...and just where is that voltage regulator?


~Jeff~

1984 28' Regal P30
 
Posts: 159 | Location: Mississippi | Member Since: 09-13-2009Reply With QuoteReport This Post
First Month Member
Supporting Member of Barthmobile.com 11/13
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quote:
Originally posted by jsloan:
When I just measured the voltage at the battery, I am getting 14.8 - 15V. Do I have voltage regulator problems?


No. That's the high end of normal.

quote:


Oh...and just where is that voltage regulator?


Its a little triangle-shaped thing inside the alternator with two tabs sticking out for the plug.

If you are OK replacing it, I would carry a spare. USA made.


.

84 30T PeeThirty-Something, 502 powered
 
Posts: 7397 | Location: AZ Central Highlands | Member Since: 01-09-2001Reply With QuoteReport This Post
Picture of jsloan
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So, this is ok and I shouldn't be alarmed? Is there a reason it would be running at the high end? I'm pretty sure the battery is at full charge. Will this damage any electronics?


~Jeff~

1984 28' Regal P30
 
Posts: 159 | Location: Mississippi | Member Since: 09-13-2009Reply With QuoteReport This Post
Picture of jsloan
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Oh, one more thing. If I crank her up and have cabin lights on they kind of pulse. Something is not quite right yet...


~Jeff~

1984 28' Regal P30
 
Posts: 159 | Location: Mississippi | Member Since: 09-13-2009Reply With QuoteReport This Post
Supporting Member of Barthmobile.com 2/16
Captain Doom
Picture of Rusty
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That could be the isolator or relay - or a bad diode. Alternator output is actually rectified AC (not flatline DC), and if one leg of the diode bridge is bad, pulsation occurs.


Rusty


MilSpec AMG 6.5L TD 230HP; built-to-order by Peninsular Engines:  Hi-pop injectors, gear-driven camshaft, non-waste-gated, high-output turbo, 18:1 pistons.  Fuel economy increased by 15-20%, power, WOW!"StaRV II"

'94 28' Breakaway: MilSpec AMG 6.5L TD 230HP

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Posts: 8200 | Location: Brooker, FL, USA | Member Since: 09-08-2005Reply With QuoteReport This Post
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Supporting Member of Barthmobile.com 11/13
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quote:
Originally posted by jsloan:
Oh, one more thing. If I crank her up and have cabin lights on they kind of pulse. Something is not quite right yet...


Do your headlights, dash lights, running lights and tail lights pulse, as well?


.

84 30T PeeThirty-Something, 502 powered
 
Posts: 7397 | Location: AZ Central Highlands | Member Since: 01-09-2001Reply With QuoteReport This Post
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quote:
Do your headlights, dash lights, running lights and tail lights pulse, as well?



Yup. I think in the spirit of throwing money at it I will try replacing the VR. I'll be grabbing one from NAPA and swappin it out today.


~Jeff~

1984 28' Regal P30
 
Posts: 159 | Location: Mississippi | Member Since: 09-13-2009Reply With QuoteReport This Post
First Month Member
Supporting Member of Barthmobile.com 11/13
posted Hide Post
quote:
Originally posted by jsloan:
quote:
Do your headlights, dash lights, running lights and tail lights pulse, as well?



YUP.


Then the diodes should definitely be checked. Also the diode trio, while you're in there, but my diode trio failures have not caused pulsation.

Check brush wear, too. They can work when short, but sometimes will howl, as they are too short to sit firmly in the rather loose-fitting holder.

quote:
I think in the spirit of throwing money at it I will try replacing the VR. I'll be grabbing one from NAPA and swappin it out today.


NAPA sells two grades. In the spirit of throwing money at it, buy the better one.

http://www.napaonline.com/Mast...on=Voltage+Regulator


.

84 30T PeeThirty-Something, 502 powered
 
Posts: 7397 | Location: AZ Central Highlands | Member Since: 01-09-2001Reply With QuoteReport This Post
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I drove around a bit today and the pulsing seemed to quit and the voltage gauge dropped to normal levels. I took it to an alternator shop and had it checked and the guy said he thought it was perfect. So, now I feel better and haven't spent any money to speak of, which is always a good thing. Now, on to the speed-o-meter and the NuTone blender mechanic


~Jeff~

1984 28' Regal P30
 
Posts: 159 | Location: Mississippi | Member Since: 09-13-2009Reply With QuoteReport This Post
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