New Alternator or New Voltage Regulator - JeepForum.com
 
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post #1 of 7 Old 09-07-2011, 04:25 PM Thread Starter
wrobleskis
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1982 CJ7 
 
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New Alternator or New Voltage Regulator

Well, It looks like my Voltage regulator is acting up. I'm getting 16+ volts.

I am wondering if I should change out the Voltage Regulator or just get a new alternator.

I have an 82 CJ7 with 258 I6 and Junkyard TBI.

I do not know how new or old the existing alternator is. It appears to be stock type. I don't plan on adding any electronics that would require a power upgrade.

Looks like $25 for the regulator and $50 for the alternator.

Any comments would be greatly appreciated.

Thanks,

Scott

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post #2 of 7 Old 09-07-2011, 06:03 PM
wellmax
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i have a 84 model jeep and i thought the voltage regulator was internal on my alternator???

maybe its not, but i was having the same issues, voltage meter going high.

have live time unit from autozone and they just swapped it out.
no problems.
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post #3 of 7 Old 09-07-2011, 08:29 PM
BagusJeep
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The voltage regulator in this year was internal to the alternator. (Item 6 in this diagram from the parts manual)

It is worth checking for $50 whether this includes all this gubbins, I would expect it to. Unless you were a bit handy with electrical gear it may be just plain easier to replace the entire unit. For $50 you will get a reliable source of power which may outlast the vehicle.
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post #4 of 7 Old 09-07-2011, 09:24 PM
ejeeperguy
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The vr on my alt is on the outside on my 82. I guess whatever they had lying around they put in.
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post #5 of 7 Old 09-07-2011, 10:02 PM
BagusJeep
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Or it has been changed by a PO, the swines.

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1981 CJ7 258ci - Bagusjeep
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1981 J20 258ci - Gladys
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post #6 of 7 Old 09-08-2011, 03:58 AM
Mike Romain
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Quote:
Originally Posted by ejeeperguy View Post
The vr on my alt is on the outside on my 82. I guess whatever they had lying around they put in.
Are you sure? That is a 'real' old way of doing it, they changed over to AC Delco alternators in the late 70's.

That part on the fender that looks something like a regulator is actually an emissions driver for the carb on the emissions cusp year of 81/82.

If you have 2 wires coming off the back of the alternator, you have the AC Delco one.

A high volt reading can simply be a loose alternator belt. They slip under load and the volts go high trying to make up for it. A dirty battery cable connection can also cause this. To test the belt, I take a cold off engine and see if I can hand slip the alternator pulley. If I can the belt either needs tightening or if tight it has become polished up and needs replacing. they polish up easy. Mud = liquid sandpaper.

Mike
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post #7 of 7 Old 09-08-2011, 09:58 AM
JeepHammer
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Quote:
Originally Posted by wrobleskis View Post
Well, It looks like my Voltage regulator is acting up. I'm getting 16+ volts.

I am wondering if I should change out the Voltage Regulator or just get a new alternator.

I have an 82 CJ7 with 258 I6 and Junkyard TBI.

I do not know how new or old the existing alternator is. It appears to be stock type. I don't plan on adding any electronics that would require a power upgrade.

Looks like $25 for the regulator and $50 for the alternator.

Any comments would be greatly appreciated.

Thanks,

Scott
I don't want to sound like a broken record...

But since you have TBI, it would be advisible to swtich your alternator.

The Delco SI series does NOT have a rectifier that gets along with electronic fuel injection very well.

A better swap would be to a CS alternator with regulation/rectification that gets along much better with fuel injection and charges better at lower RPMs.

-----------------------

If you rebuild/replace your alternator, make sure you add a dedicated ground wire to the case back to the primary 'Ground' or battery terminal...
This will give you MUCH better voltage control, your regulator will last longer, and it won't be nearly as hard on the Fuel Injection Computer when the initial voltage spike happens as the alternator starts charging.
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