Couple of electrical questions - Team Camaro Tech
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post #1 of 8 (permalink) Old Jan 7th, 13, 06:50 AM Thread Starter
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Couple of electrical questions

I have 68 6cylinder and the dash lights pulse when the car is running with the head lights on. Any best guesses the culprit? I am thinking possibly the alternator regulator? The reason I guess the regulator is because I have already noticed the battery I replaced was being overcharged and had boiled over and destroyed the battery tray. When I check the charging system voltage with the car running I am getting upwards of 15 plus volts. I have a 67 Chevrolet service manual and in the charging system voltage section it states up to 15.2 volts could be normal charging rate? Seems awful high to me. I assume I should just bite the bullet and replace the voltage regulator. Is there a specific regulator that is preferred these days?... Any help / advice would be appreciated.


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post #2 of 8 (permalink) Old Jan 7th, 13, 07:16 AM
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Re: Couple of electrical questions

Depends upon the battery state of charge.
If it is low, then yes, charge voltage wiil be high.

Run the car, let the VR cover get to 130įF, then measure again, s/b around 13.5 volts.
You can set the regulator by removing the cover, lengthening the spring - increases voltage, or shorten the spring - decreases voltage. Always replace the cover and let the VR recover in temperature to get a good reading.
Monitor the battery for a week, and dependent upon charge, make adjustments accordingly. Just like back in the '60's & '70's.

Or, just replace the VR with a Wells P/N VR715 electronic reg, plug & play. Don't forget the ground strap on the mounting bolt.

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post #3 of 8 (permalink) Old Jan 7th, 13, 07:55 AM Thread Starter
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Re: Couple of electrical questions

Thanks for the help!


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post #4 of 8 (permalink) Old Jan 7th, 13, 08:41 AM
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Re: Couple of electrical questions

Charge voltage depends on temp.

Keep in mind nominal voltage of charged bat should be 13.6V at room temp.

Maximum charge voltages for cyclic use (like starting a car) are 15.2 volts at about 70 degrees F and almost 16V at 32 degrees F.

Minimum charge voltage would be on the order of 13V at room temp for a discharged bat (a discharged bat is below 13.6V....).

Probably best to see your charge voltage between 14 and 15 if it is a simple mechanical regulator with no temp feedback.


I design battery chargers, so I got all these numbers dancing in my head....


EDIT: The voltages listed are charge voltages for cyclic applications (think battery low from starting) - once majority of charge is restored battery should be held at between 13.5 and 14.3 by the alternator/regulator.

Last edited by stouchton; Jan 7th, 13 at 09:21 AM. Reason: old age again!
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post #5 of 8 (permalink) Old Jan 7th, 13, 11:05 AM
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Re: Couple of electrical questions

Quote:
Originally Posted by Everett#2390 View Post
Don't forget the ground strap on the mounting bolt.
X2 w/o a good ground connection here voltage can go way high - happened to me and the batt exploded.


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post #6 of 8 (permalink) Old Jan 8th, 13, 06:43 AM Thread Starter
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Re: Couple of electrical questions

thanks again for the input guys. I am going to double check my grounds and check the voltages again after it has been running and fully charged. I will probably splurge for a modern regulator that is plug/play since this is supposed to be a daily driver soon and I want to make it as hassle free as possible.


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post #7 of 8 (permalink) Old Jan 8th, 13, 07:40 AM
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Re: Couple of electrical questions

Jeff I agree with Ev...get that new VR715.. only $12 here at any parts store and its plug and play -- easy-- simple to install. You can even keep your old 'original' VR cap and swap it for the new VR cap, so it looks original when you are done

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post #8 of 8 (permalink) Old Jan 8th, 13, 10:52 AM
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Re: Couple of electrical questions

...or consider swapping to a 10SI or 12SI internally regulated 3 wire alternator - simple, inexpensive and better output at idle.


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