Voltage Regulator Rating

Anonymous-0 · Jan 21, 2010

I am working on the electrical system of a 1951H that I recently purchased. When I got it home, it had a 12V battery, but I had the generator checked and it is a 6V generator. The voltage regulator has been replaced with a modern unit. How can I check the rating of the regulator to make sure it is a 6V unit?

Thanks.

Janicholson · Jan 21, 2010

If it has numbers on the bottom, or top/sides, the number can be referenced at a NAPA, or possibly google for it (put in voltage regulator xxx-xx-xxx) filling in the number as printed on the reg. If no numbers are on it, the pull in voltage of the cutout relay would do it.

With the following items a 6v battery, a variable voltage supply from 0-20 v, the Voltage reg in question, a volt meter (if the power supply does not have one built in), and some jumper wires.

Connect the battery + to the Power supply +
Connect the power supply - (with the volts at zero) to the arm terminal of the reg.
connect the Bat term of the reg to the - battery post.
Connect the volt meter across the Arm to Bat terms of the VR with the black lead on the arm terminal.

Begin turning up the voltage watching the meter.
as the voltage gets between 7 and 8 volts, a click should be heard as the cutout closes, and the meter across the relay should go to zero. This is a 6 volt reg.
If it gets to 13 volts or more before clicking, it is 12v. If it does not close, or is permanently closed already, it is toast. JimN

440roadrunner · Jan 21, 2010

(quoted from post at 21:45:48 01/21/10) If it has numbers on the bottom, or top/sides, the number can be referenced at a NAPA, or possibly google for it (put in voltage regulator xxx-xx-xxx) filling in the number as printed on the reg. If no numbers are on it, the pull in voltage of the cutout relay would do it.

With the following items a 6v battery, a variable voltage supply from 0-20 v, the Voltage reg in question, a volt meter (if the power supply does not have one built in), and some jumper wires.

Connect the battery + to the Power supply +
Connect the power supply - (with the volts at zero) to the arm terminal of the reg.
connect the Bat term of the reg to the - battery post.
Connect the volt meter across the Arm to Bat terms of the VR with the black lead on the arm terminal.

Begin turning up the voltage watching the meter.
as the voltage gets between 7 and 8 volts, a click should be heard as the cutout closes, and the meter across the relay should go to zero. This is a 6 volt reg.
If it gets to 13 volts or more before clicking, it is 12v. If it does not close, or is permanently closed already, it is toast. JimN

I doubt that he's got a variable supply or he probably would not be asking, but I'm not convinced that your method will work?????

A cutout has a series and a shunt winding. The shunt winding is the "voltage" winding, seems to me you'd have to connect the power supply to the A (G) and ground of the regulator, but it would be MORE accurate to watch for the voltage regulator relay to click in, no?

Anonymous-0 · Jan 22, 2010

If the case of the regulator is not grounded, the cutout relay can never close and you will be condemning good regulators.

gene bender · Jan 22, 2010

If you remove it a look at the bottom lots of them will say voltage and ground required. What is the Delco Remy # on your gen. Then determine that you have the correct regulator for that gen. The one size fits all must not work as they do list several regulators Your H could have came with a cut-out with three terminals batt,gen and field

Janicholson · Jan 22, 2010

Good point, the case of the regulator should be grounded to the positive side of the power supply. Late night reality. Jim

Jim Becker · Jan 22, 2010

I doubt that he's got a variable supply or he probably would not be asking, but I'm not convinced that your method will work?????

A cutout has a series and a shunt winding. The shunt winding is the "voltage" winding, seems to me you'd have to connect the power supply to the A (G) and ground of the regulator, but it would be MORE accurate to watch for the voltage regulator relay to click in, no?

The regulator would have to be grounded for this test to work. I have never tried testing this way, but suspect that a 6/12-volt battery maintainer is all the variable power supply required. With the maintainer set at 6, a 6-volt cut-out should kick in and a 12-volt not.

I also think the test can probably be done without a battery, just connect a voltmeter between the regulator ground and BAT terminal.

Janicholson · Jan 22, 2010

I think it would, I did it on a jeep once to see if the regulator was working (cutout relay) and you are correct I left out the regulator ground (to the positive side of the Power supply). In my jeep test the regulator was grounded to the system I was messing with. I just forgot that the pull in winding uses that ground to work. Tom found it below. Jim

teddy52food · Jan 22, 2010

How did you have the gen checked? If by part # it could have been rewired to 12 volt. If they ran it & it only would charge a 6 volt system, then it would be still 6 volt.

Voltage Regulator Rating

Anonymous-0

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440roadrunner

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gene bender

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