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Old 01-27-2021, 06:30 AM   #21
chap52
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Default Re: where is the most idiot-proof diagram of terminal box wiring?

Had an amp meter reading backwards. Being the genius of shade tree mechanics that I am, I declared it old and replaced it with a new re-pop one. It read backwards also??? switched the wires around and it read correctly. Removed new re-pop and re-installed original gauge, wiring it correctly. DAH-DAH, it worked properly.
I have a lot of extra, slightly used parts in my garage from performing immediate surgery where all that was needed was a little TLC... Just me? Chap
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Old 01-27-2021, 07:56 PM   #22
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Default Re: where is the most idiot-proof diagram of terminal box wiring?

some diagrams differ on the location of the yellow/yellow-black wiring leading to the terminal box
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Old 01-27-2021, 08:23 PM   #23
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Default Re: where is the most idiot-proof diagram of terminal box wiring?

just to explain there was no harm meant in my jingles remark. It was indeed an attempt at complimentary humour. Wayne
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Old 01-28-2021, 11:10 AM   #24
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Default Re: where is the most idiot-proof diagram of terminal box wiring?

The poster shown below has a couple of wiring diagrams from Ford that were included in the 'Service Bulletins' along with much more information. Many Model A Parts dealers carry them. They are also directly available from me, see my post (frank55a) on the swap meet page.
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Old 03-01-2021, 08:27 PM   #25
Gene F
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Default Re: where is the most idiot-proof diagram of terminal box wiring?

I have used the polarity tester too. Just got it, and mine was correct to start with. I always wanted one, and was getting an order together so I thought what the heck. I wonder if ya can really feel the difference driving down the road?
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Old 03-02-2021, 08:57 AM   #26
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Default Re: where is the most idiot-proof diagram of terminal box wiring?

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All these diagrams are for a stock car. If the car has been converted to 12 volts with a negative ground or the ignition switch has been changed to a modern type, then the wiring is different. In that case, Eric R would find it best to have someone who understands the theory help him with his car.

By the way, the service bulletins show a change to the junction box wiring in about January of 1930 to make the ammeter read the discharge current from the ignition system. The black wire was moved from one post to the other. See the service bulletins for details.
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Old 03-19-2021, 10:14 AM   #27
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Default Re: where is the most idiot-proof diagram of terminal box wiring?

Hello! I have found many 6v positive to ground diagrams, my model A is 12v negative ground. Doing a complete restoration and re-wire of vehicle. Is there a "correct" diagram available for the proper connections for 12v. The MAFCA one is great but it will not work for my needs. Thanks!
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Old 03-19-2021, 12:23 PM   #28
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Default Re: where is the most idiot-proof diagram of terminal box wiring?

Quote:
Originally Posted by Bob Bidonde View Post
Here is my rendition of the terminal box wire hookup.


Hmmm, And here I was under the impression that the original 6v electrical system was 6v positive ground??
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Old 03-19-2021, 02:52 PM   #29
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Default Re: where is the most idiot-proof diagram of terminal box wiring?

Quote:
Originally Posted by greenman View Post
Hello! I have found many 6v positive to ground diagrams, my model A is 12v negative ground. Doing a complete restoration and re-wire of vehicle. Is there a "correct" diagram available for the proper connections for 12v. The MAFCA one is great but it will not work for my needs. Thanks!
The wiring is the same for either + or - ground. The only difference is the battery, coil and ammeter posts are reversed. Voltage is determined by the battery, with a different cutout set point.
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Old 03-20-2021, 10:27 AM   #30
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Default Re: where is the most idiot-proof diagram of terminal box wiring?

Quote:
Originally Posted by greenman View Post
Hello! I have found many 6v positive to ground diagrams, my model A is 12v negative ground. Doing a complete restoration and re-wire of vehicle. Is there a "correct" diagram available for the proper connections for 12v. The MAFCA one is great but it will not work for my needs. Thanks!
Doing a proper "complete restoration" would require going back to 6V positive ground.
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