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Restoration & Repair Tips Board

Re: 1948 Ferguson TO-20 Electrical System

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Randy Roberson

10-23-2012 11:20:19
146.130.64.165



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Solenoid has two high-current (large) terminal posts: one from the positive side of the battery, and the other from the solenoid to the starter. It has three small posts: one goes to the key switch, then to the ballast resistor, to power the ignition; one activates the solenoid by giving it 12V from the pos battery post, and usually the third one is a ballast resistor bypass. It becomes energized when cranking (when the solenoid is energized) and sends the full 12V to the ignition system, bypassing the ballast resistor, so the ignition has more power for starting.
Looks like it was not connected and all the ignition was going through the ballast resistor all the time, so it may not be necessary. You used to see this setup on Ford products.

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Randy Roberson

10-23-2012 11:21:40
146.130.64.165



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 Re: 1948 Ferguson TO-20 Electrical System in reply to Randy Roberson, 10-23-2012 11:20:19  
I may have it wrong, I'll look at it when I get home and see how wrong.



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