how do I tell if I have an internal or external voltage regulator? - Team Camaro Tech
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post #1 of 7 (permalink) Old Mar 9th, 13, 06:31 PM Thread Starter
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George
 
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how do I tell if I have an internal or external voltage regulator?

I have a 68 L6 250 engine. I don't know what the previous owner had or had not done. The alternator has one large red plug and two smaller wires going into it. The two smaller ones are close together.

I have some time to kill here as I wait for the flatbed...

If I do have an external voltage regulator system where is the regulator and how do I test it or the alternator to figure out which one needs to be forcefully thrown out of my garage and later smashed into tiny pieces with a rather large hammer?

Thanks in advance and I think I'll get some beer after I get home...

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1968 Base hardtop 250 with a P̶G̶ built 2004r
Offy intake
Holley 390 CFM carb
Langdon split header to a 2.5" exhaust
Mild cam
Custom interior
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post #2 of 7 (permalink) Old Mar 9th, 13, 06:45 PM
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Tim
 
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Re: how do I tell if I have an internal or external voltage regulator?

Quote:
Originally Posted by Gbauer View Post
If I do have an external voltage regulator system where is the regulator
It will be mounted to the radiator support panel on the driver's side, little black box about 2" cubed.

1969 04A Van Nuys-built Z/28. Cortez Silver with dark blue interior and VE3. Sold Clippinger Chevrolet. Raced at Lions in LA.
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post #3 of 7 (permalink) Old Mar 9th, 13, 06:58 PM Thread Starter
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Re: how do I tell if I have an internal or external voltage regulator?

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Originally Posted by ZLP955 View Post
It will be mounted to the radiator support panel on the driver's side, little black box about 2" cubed.
Found it! Thanks!

Now how do I tell if it's bad or if the alternator is bad?

Tow truck is due here in 15 minutes...

Sold:
1968 Base hardtop 250 with a P̶G̶ built 2004r
Offy intake
Holley 390 CFM carb
Langdon split header to a 2.5" exhaust
Mild cam
Custom interior
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post #4 of 7 (permalink) Old Mar 9th, 13, 07:05 PM
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Re: how do I tell if I have an internal or external voltage regulator?

You could take it off and take it to O'reilly auto parts, and they will test it for free. Other wise to test it your self you'll need a multi-meter
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post #5 of 7 (permalink) Old Mar 9th, 13, 08:17 PM Thread Starter
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George
 
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Re: how do I tell if I have an internal or external voltage regulator?

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Originally Posted by jcfcamaro View Post
You could take it off and take it to O'reilly auto parts, and they will test it for free. Other wise to test it your self you'll need a multi-meter
I have a decent multimeter.

Sold:
1968 Base hardtop 250 with a P̶G̶ built 2004r
Offy intake
Holley 390 CFM carb
Langdon split header to a 2.5" exhaust
Mild cam
Custom interior
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post #6 of 7 (permalink) Old Mar 10th, 13, 11:39 AM Thread Starter
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Re: how do I tell if I have an internal or external voltage regulator?

So I did some testing.

First off the regulator isn't clicking over at all. I touched the contacts over the coil that determines when to turn on the system and the other contact closed so I know the coil that energizes the system is good.

I then ran a 12V wire from the battery to the "F" wire (Blue) and tested the voltage.

Car off: 12V
Car running as-is: 11.7V
Car running with wire run from battery to blue "F" wire on regulator: 11.6V

Obviously my alternator isn't charging and I believe my regulator is fried as well. Am I missing something?

Sold:
1968 Base hardtop 250 with a P̶G̶ built 2004r
Offy intake
Holley 390 CFM carb
Langdon split header to a 2.5" exhaust
Mild cam
Custom interior
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post #7 of 7 (permalink) Old Mar 10th, 13, 12:08 PM
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Al
 
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Re: how do I tell if I have an internal or external voltage regulator?

You can have your alt tested for free at Auto Zone, O'reilly etc. I believe they have those in the "United States"

If your alt tests bad, still a good idea to replace the VR with a solid state version, VR715.

A better idea in my opinion is to swap to an internally regulated 10si 0r 12si alt.


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