In the early battery ignition systems there were a few manufacturers that actually had a resistor inside the coil and 3 small terminals to allow that resistor to be bypassed for starting. None made today have internal resistors, the words "external resistor required" found on the coil seems to imply that there is a internal resistor in some coils. Not true. coils today are made to operate at about 7 volts (charging voltage), or 14.5 volts (charging voltage for 12v batteries) A 6v coil can use a external resistor to allow it to operate at 12v. This often includes a bypass wire form a special terminal on the starter relay/solenoid, to operate at cranking voltage to assist starting. Jim
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Today's Featured Article - Tractor Profile: Allis-Chalmers Model G - by Staff. The first Allis-Chalmers Model G was produced in 1948 in Gasden, Alabama, and was designed for vegetable gardeners, small farms and landscape businesses. It is a small compact tractor that came with a complete line of implements especially tailored for its unique design. It featured a rear-mounted Continental N62 four-cylinder engine with a 2-3/8 x 3-1/2 inch bore and stroke. The rear-mounted engine provided traction for the rear wheels while at the same time gave the tractor operator a gre
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