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Old 05-29-2020, 11:24 AM   #1
pebo va
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Default Voltage Regulator Replacement

I need to replace my VR in my stock 6 volt "49 Ford. I never seem to get more than 2-3 years service from the NAPA VR 401 made by Echlin.
I have an American Bosch, 6 volt 40 amp, new in the box, replacement but it is much heavier and a bit larger than the Echlin. If I install the American Bosch and it malfunctions for some reason, can it damage some other part of my electrical system? Is there any other downside other than it just doesn't work?
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Old 05-29-2020, 11:41 AM   #2
tubman
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Default Re: Voltage Regulator Replacement

I can't speak to the problems using a 40 amp regulator in a circuit intended for 30 amps, but can attest to the fact that the quality of current replacements has slipped badly over the years. I installed a solid-state replacement in my '67 Corvette about 5 years ago after experiencing the same problems you have. A member on here, "flatheadmurre" has developed a solid state regulator for 6 volt positive ground 30 amp systems that may be just the ticket. I can vouch for him and the quality of anything he offers. The only problem is that he is located in Sweden. You may want to PM him about the possibilities.
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Old 05-29-2020, 01:08 PM   #3
marko39
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Default Re: Voltage Regulator Replacement

You can find Nors regulators, have you checked with any of the excellent venders on this site?
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Old 05-29-2020, 02:02 PM   #4
Aarongriffey
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Default Re: Voltage Regulator Replacement

Using a 40 amp regulator with a 30 amp generator is like haul 3 tons on a truck that was rated for 4 tons.
Take the generator and voltage regulator to a starter & generator rebuilding shop and ask them about it.
Remember to remind them it is positive ground if they offer to test everything for you.
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Old 05-29-2020, 02:13 PM   #5
Aarongriffey
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Default Re: Voltage Regulator Replacement

Tubman is right, that stuff is getting harder and harder to come by.
On my ‘51 F1 I have a 6 volt Chevy generator with a Chevy 12 voltage regulator mounted upside down so the wires will reach charging 12 volts because I changed the truck to 12 volts since I often rent small utility trailers that are always 12 volt.
It had the Chevy generator and a 6 volt regulator when I bought it.
I plan to put an alternator on it, I’d hate to have something happen to the charge system a few hundred miles from home, or on a Sunday.
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Old 05-29-2020, 02:17 PM   #6
flatheadmurre
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Default Re: Voltage Regulator Replacement

I have American Bosch generators...they are the size used for Lincolns...
Using a regulator with a 40A current limitation on a 30A rated armature isnīt the best choice...
My solidstate regulators is about 3 month away from the first customer units for sale.
I have units out in field testing right now.
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Old 05-29-2020, 02:52 PM   #7
pebo va
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Default Re: Voltage Regulator Replacement

Thanks to all for the good advice. I will wait until flatheadmurre has completed his test and give that a try. I am hoping my NAPA VR will last 3 months.
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Old 05-29-2020, 03:13 PM   #8
Kurt in NJ
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Default Re: Voltage Regulator Replacement

The regulator has to limit amperage to protect the generator
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Old 05-30-2020, 07:05 AM   #9
1931 flamingo
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Default Re: Voltage Regulator Replacement

Take the regulator to an old time starter/gen shop and have it tested/repaired. JMO
Paul in CT


Recently had the gen in my 40 rebuilt, took the gen and regulator together.
FWIW
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Old 05-30-2020, 07:48 PM   #10
koates
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Default Re: Voltage Regulator Replacement

The centre relay in your 40 amp regulator is the current control which can be adjusted down to 32 amps to match your generators safe maximum output. Best to find an older auto electrical shop with an experienced older man who knows how to do this adjustment. It should work fine with your 32 amp generator. Regards, Kevin.
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