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Ford 9N, 2N & 8N Discussion Forum
Show Parts for Model:

Re: why is ballast resistor not needed?

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Author  [Modern View]
Dell (WA)

01-18-2013 10:04:12
174.24.221.232



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Steve.........ya gotta understand what the "infamous ballast resistor" does. It is an "auto-magic" electronic trick that changes resistance with temperature. Heres the deal, in 1939 when the 9N tractor was designed, batterys were NOT DIE-HARDS, they were die-eazy when the starter motor sucked 150-amps of power outta the battery. So Ford designed the weird 4-nipple squarecan coil to run on 3-volts (+) the ballast resistor. The ballast resistor cuts the 6-volts down to 3-volts AFTER the tractor starts. But because of the COLD temperature, the ballast resistor acts like it is not even there and supplies 6-volts to the 3-volt coil for HOTTER sparkies and quicker starting. Once you let up on the safety interlocked tranny starter switch, the ballast resistor changes resistance value in about 2-mins and now the squarecan coil gitts its designed value of 3-volts. Modern 6-volt roundcan coils are built differently and do NOT need the "infamous ballast resistor". Isn't that amazing??? ........respectfully, Dell, yer self-appointed sparkie-meister

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