Which Voltage regulator do I have ?
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Topic author - Posts: 203
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- First Name: Anthonie
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Which Voltage regulator do I have ?
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
Toon
Thanks for tour answer
Toon
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Re: Which Voltage regulator do I have ?
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.
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 ?
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 ?
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.
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The past is a great place and I don't want to erase it or to regret it, but I don't want to be its prisoner either.
Mick Jagger
Mick Jagger
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Topic author - Posts: 203
- Joined: Mon Jan 07, 2019 2:41 pm
- First Name: Anthonie
- Last Name: Boer
- * REQUIRED* Type and Year of Model Ts owned: 1912 touring 1923 roadster 1925 pickup
- Location: Klaaswaal NL
- MTFCA Number: 19790
Re: Which Voltage regulator do I have ?
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
The welds where NOT open .
Thanks for your answer .
Toon
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Re: Which Voltage regulator do I have ?
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!
1925 Cut down pickup
1920 Dodge touring
1948 Ford F2 pickup
1925 Cut down pickup
1920 Dodge touring
1948 Ford F2 pickup
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Re: Which Voltage regulator do I have ?
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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The past is a great place and I don't want to erase it or to regret it, but I don't want to be its prisoner either.
Mick Jagger
Mick Jagger
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Re: Which Voltage regulator do I have ?
Post on April 15 will tell how to ID voltage regulators: http://www.mtfca.com/discus/messages/17 ... 1302916449
Scott Conger
Tyranny under the guise of law is still Tyranny
NH Full Flow Float Valves
Obsolete carburetor parts manufactured
Tyranny under the guise of law is still Tyranny
NH Full Flow Float Valves
Obsolete carburetor parts manufactured
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Re: Which Voltage regulator do I have ?
So, it's just a diode cutout, not a regulator.