Which Voltage regulator do I have ?

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ABoer
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Which Voltage regulator do I have ?

Post by ABoer » Fri Dec 20, 2019 6:54 am

This VR came from a Model Ford Model A , but I am not sure about the voltage and or it is negativ or positive to ground .
Thanks for tour answer
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IMG_0970.JPG

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Re: Which Voltage regulator do I have ?

Post by JohnH » Fri Dec 20, 2019 7:34 am

The VR is essentially an ordinary diode cutout with a form of switchmode shunt regulation. To determine whether it's for positive or negative earth, simply test for the diode direction between the generator and battery terminals on the VR.
For example, if you were to connect a battery positive terminal to the generator terminal of the VR, and a light bulb between the VR's battery terminal and the negative terminal of the battery, and the bulb lit up, the VR would be for a negative earth car. Don't connect anything to the casing of the VR for this test.
Keep in mind Model A's are positive earth as standard, so there's a chance the VR is for positive earth unless the electrical system was modified.

Once you know the polarity, you can test what the voltage is with a current limited variable power supply fed into the generator terminal and see what voltage the crowbar circuit comes into action. It's going to get a bit technical beyond this, but I can give you more info if you want to PM me.

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Re: Which Voltage regulator do I have ?

Post by RajoRacer » Fri Dec 20, 2019 11:14 am

John Regan might be able to identify it looking at the bottom being's he made it ?

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Re: Which Voltage regulator do I have ?

Post by TRDxB2 » Sun Dec 22, 2019 4:07 am

What you have appears to be a Voltage Regulator BUT it may have been modified. Note the open weld and the screw missing from the base.
opened VR.JPG
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ABoer
Posts: 203
Joined: Mon Jan 07, 2019 2:41 pm
First Name: Anthonie
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Re: Which Voltage regulator do I have ?

Post by ABoer » Sun Dec 22, 2019 9:01 am

Hi all ; To be sure what was in , I opened the [Regulator] and found a Diode .
The welds where NOT open .
Thanks for your answer .
Toon
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IMG_0974.JPG
IMG_0973.JPG

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Re: Which Voltage regulator do I have ?

Post by Mark Gregush » Sun Dec 22, 2019 12:19 pm

From the information I have found that unit was made for cars the VERY seldom got driven, if it came off a Model A it has a diode for positive ground and will not work on a negative ground Model T.
I know the voices aren't real but damn they have some good ideas! :shock:

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Re: Which Voltage regulator do I have ?

Post by TRDxB2 » Sun Dec 22, 2019 12:49 pm

Found another picture of the Fun Projects Cut Out 5055 for a Model T there is a difference in the base screws & rivets. Not sure if that is what distinguishes a T from the A model
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Re: Which Voltage regulator do I have ?

Post by Scott_Conger » Sun Dec 22, 2019 2:05 pm

Post on April 15 will tell how to ID voltage regulators: http://www.mtfca.com/discus/messages/17 ... 1302916449
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Re: Which Voltage regulator do I have ?

Post by JohnH » Sun Dec 22, 2019 3:58 pm

So, it's just a diode cutout, not a regulator.

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