Mounting of the Voltage Regulator & Brand Recommendation ?? - Team Camaro Tech
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post #1 of 16 (permalink) Old Mar 29th, 10, 05:25 PM Thread Starter
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Mounting of the Voltage Regulator & Brand Recommendation ??

I am trying to solve a battery discharge problem and am replacing the Voltage Regulator with a NAPA Echlin VR142 as recommended on another discussion on T/C. On the back of the regulator is a fifth tab pointing up on this photo. Is something supposed to connect to this tab?



Thanks guys!

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post #2 of 16 (permalink) Old Mar 29th, 10, 05:30 PM
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Re: Mounting of the Voltage Regulator

The capacitor for radio noise suppresion. It mounts to one of the three screws. You need to make sure the screws are grounded well to the radiator support for the regulator to work correctly.

Here is a picture.

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post #3 of 16 (permalink) Old Mar 29th, 10, 05:48 PM
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Re: Mounting of the Voltage Regulator

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Originally Posted by Gary L View Post
The capacitor for radio noise suppresion. It mounts to one of the three screws. You need to make sure the screws are grounded well to the radiator support for the regulator to work correctly.
Simular to this...


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post #4 of 16 (permalink) Old Mar 29th, 10, 05:53 PM Thread Starter
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Re: Mounting of the Voltage Regulator

Thanks guys, that's good information. I have been reading some more and see the Wells P/N VR715 unit recommended pretty frequently. Should I return this NAPA Echlin unit at $54 and instead buy a Wells VR715 for ~$18 instead? I am not worried about the money as much as wanting the best unit for the car.

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post #5 of 16 (permalink) Old Mar 29th, 10, 06:43 PM
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Re: Mounting of the Voltage Regulator

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Originally Posted by X33D80 View Post
Thanks guys, that's good information. I have been reading some more and see the Wells P/N VR715 unit recommended pretty frequently. Should I return this NAPA Echlin unit at $54 and instead buy a Wells VR715 for ~$18 instead? I am not worried about the money as much as wanting the best unit for the car.
Do one of the above, unless you have your original dated VR in which case have it restored and use it on your Z/28.

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post #6 of 16 (permalink) Old Mar 30th, 10, 03:27 AM
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Re: Mounting of the Voltage Regulator & Brand Recommendation ??

Keep the original dated reg, install the VR715, and transfer the cover if you like.

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post #7 of 16 (permalink) Old Mar 30th, 10, 05:13 AM Thread Starter
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Re: Mounting of the Voltage Regulator & Brand Recommendation ??

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Originally Posted by Everett#2390 View Post
Keep the original dated reg, install the VR715, and transfer the cover if you like.
Unfortunately I do not have the original voltage regulator for the car. Is the NAPA mechanical unit worth keeping at $53 or is the Wells unit for ~$16 just as good for my application. I am more concerned with functionality than cost. Leaving cost out of the decision, which unit is the better choice?

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post #8 of 16 (permalink) Old Mar 30th, 10, 06:07 AM
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Re: Mounting of the Voltage Regulator & Brand Recommendation ??

Electronic, VR715. Reading from others here, they have not had any problems.

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post #9 of 16 (permalink) Old Mar 30th, 10, 07:07 AM
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Re: Mounting of the Voltage Regulator & Brand Recommendation ??

I just switched to a 12si setup and have a barely used VR715 if you are interested. I also have a high output stock style alternator if you are having charging issues. PM me if you are interested.

This is the alternator: http://storesense1.mysuperpageshosti...ail.bok?no=745

I can e-mail pictures.

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post #10 of 16 (permalink) Old Mar 30th, 10, 09:33 AM Thread Starter
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Re: Mounting of the Voltage Regulator & Brand Recommendation ??

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Originally Posted by Greg O View Post
I just switched to a 12si setup and have a barely used VR715 if you are interested. I also have a high output stock style alternator if you are having charging issues. PM me if you are interested.

This is the alternator: http://storesense1.mysuperpageshosti...ail.bok?no=745

I can e-mail pictures.
Thanks for the offers Greg. I'll send you a personal email a little later.

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post #11 of 16 (permalink) Old Mar 30th, 10, 11:10 AM
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Re: Mounting of the Voltage Regulator & Brand Recommendation ??

And lastly, good luck returning an electrical part.

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post #12 of 16 (permalink) Old Mar 31st, 10, 02:46 PM Thread Starter
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Re: Mounting of the Voltage Regulator & Brand Recommendation ??

I decided to use the NAPA Echin Voltage Regulator because it has a more original GM appearance primarily a tall cap cover and a heavier metal base that is gold iridium colored. It just looks to be better quality too, even though the fully electronic alternative is probably just as effective. What can I say, it is just me, it has something to do with under hood appearance.
Anyway, I installed it on the car this afternoon following the installation instructions (run the car at idle with headlights and accessories running for 1.2 minutes, turn off the headlights and accessories let it idle down and check if the voltage light is lit). The voltage light is not lit, but the under dash voltage gauge is displaying ~15.5 volts which seems a bit high to me. Am I in danger of blowing the battery or damaging something else with 15.5V going to it? I can tell that the interior and head lights are already brighter.

Edit: I gleaned this information from a previous post when Everette helped someone else: "2. Disconnect the ground cable. remove the VR cover, look on the relay with a spring on it, about a 1/2 inch long - bottom relay? It keeps the relay open. Making the the spring longer adjusts up the charging voltage - move the stationary point at the bottom of the relay. Replace ground cable and measure charging voltage - should be up from previous readings."
Does this mean that I bend the lower tab slightly effectively shortening the spring (reducing tension) to adjust down the charging voltage?

ANOTHER UPDATE: I quickly grew impatient and made the adjustments to the spring tab as described above. After tweaking it back and forth a few times I now have charging voltage pegged at 14 volts and am good-to-go.

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post #13 of 16 (permalink) Old Mar 31st, 10, 05:45 PM
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Re: Mounting of the Voltage Regulator & Brand Recommendation ??

Good, as a battery gets warmer and VR gets warmer, charging voltage might be around 13.8 volts. With lights on, blower on,idling, voltage will be battery voltage as VR/alt can't keep up, until revs are given. Normal indications. you could have left it at 15 volts, older Fords had 15 volt charging voltage. Batteries made today can take the higher voltage.

Tuning of the charging system depended upon condition of battery, and keeping an eye on elctrolyte level, remember the older batteries? You could boil them over, too much charge voltage, or, low battery charge, not enough charging. Checking battery level was one of the full-service features at a gas station back when these cars were built until '73, 10SI was invented.

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post #14 of 16 (permalink) Old Mar 31st, 10, 06:03 PM Thread Starter
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Re: Mounting of the Voltage Regulator & Brand Recommendation ??

Thank you very much for your help Everett. So I could have left it at 15.5V? Some searches here led me to believe that was too high. I'll leave it at 14V and watch it for a little while. If it stays there, and it probably will, I may adjust it back up to 14.5 or so.
It's always fun to learn something new.

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post #15 of 16 (permalink) Old Apr 1st, 10, 06:37 AM
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Re: Mounting of the Voltage Regulator & Brand Recommendation ??

Make sure your battery is fully charged when you are making the adjustments. A low battery will take a lot of amperage until it is charged and can throw off your readings.

Just curious...would you consider upgrading to a 12si? I did a lot like you are and tinkered around with the factory system for a year (that's why I have the extra alternator, mechanical VR and digital VR ). I finally gave up and went to the 12si with internal regulator and the difference is night and day. A perfectly optimized factory external regulated system cannot hold a candle to the 12si.

The alternator is $44.95 from Autozone with a lifetime warranty and has 78 amps. At idle the DN (stock 69 type you have) puts out about 8 amps where the 12si puts out 35! The rewiring is minimal and it is a great upgrade UNLESS you want a perfectly stock appearing car. Just a thought...

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