References to "Judging Sandards" Inapropo?

marc hildebrant said:
I too put off getting them thinking they were just for judging. I have found them to be very useful for general Model A work ; although I did find an error in the electrical diagram.

Marc
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Marc, I'm not sure what the mistake is, but in late 1929 Ford made a small change to the wiring going to the ammeter, so with the key on and points closed, the coil current would now show on the meter.

I moved my ammeter wire to the other post also, so my 1928 coil draw now shows on the meter.
 
I believe that there are other errors. I don't believe that AA trucks originally had a plated instrument panel on trucks built from 1928 through mid 1930. My book is several years old and this may have been changed. Its still a valuable publication.
 
Tom Wesenberg said:
Marc, I'm not sure what the mistake is, but in late 1929 Ford made a small change to the wiring going to the ammeter, so with the key on and points closed, the coil current would now show on the meter.

I moved my ammeter wire to the other post also, so my 1928 coil draw now shows on the meter.
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Tom, is this how A's are wired to show a draw on the ammeter, when you are cranking the engine? Mine stays on '0' until the motor pops and I rev up the engine a bit to show a 'charge'. Never thought much about it until now.

Wonder why Ford did that?
 
BlueSunoco said:
Tom, is this how A's are wired to show a draw on the ammeter, when you are cranking the engine? Mine stays on '0' until the motor pops and I rev up the engine a bit to show a 'charge'. Never thought much about it until now.

Wonder why Ford did that?
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When you are cranking the engine the points open and close and the meter should move to show this. If your car won't start it is an indication of voltage getting to the coil and the distributor spinning.
 
BlueSunoco said:
Tom, is this how A's are wired to show a draw on the ammeter, when you are cranking the engine? Mine stays on '0' until the motor pops and I rev up the engine a bit to show a 'charge'. Never thought much about it until now.

Wonder why Ford did that?
Click to expand...

With the key on and points closed, the coil draws about 4 amps. If you have the original 1928-late 29 wiring, this won't show on your ammeter. If you move the coil power wire to the other terminal box stud (as Ford did in late 29) then it will show. This is also handy to remind you if you left the key on, if the points happen to be closed.
 
Tom,

Yes, the switch-over to having the coil current through the ammeter is "talked about" in the electrical section, but the schematic's do not show the change. Also, the text in the electrical section is not very clear about just why the change was made. There is some talk about the "coil polarity" being changed rather than a simple "the current now flows through the ammeter".

The material is still a very useful resource and a bargain at the price.

Marc
 
Marc, yes the coil primary terminals switched sides about the same time the coil feed wire was changed to the other terminal box stud to show the drain on the ammeter, and the coil studs changed from slant to straight. I do have one coil that is a transition period coil and doesn't meet both the changes.
 
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