The reason the resistor gets hot is as stated below (it needs to get hot to work) the reason the ignition should not be turned on while not running is that almost all engines stop with the points closed. Thus when turned on and not running, the full draw of the coil and resistor is placed on the system continuously. When running, the point closed time is about 50% on 50% off (Dwell). This results in the coil and resistor and points only having current flowing one half the time. This allows the devices in that circuit to cool half the time. Jim
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Today's Featured Article - More Memories of a Field Service Engineer - by Brian Dye. Introduction: The author worked for one of the largest Ford tractor dealerships in England as a trouble-shooter on tractor engines, hydraulics and combine harvesters from 1963 to 1972. In 1972 he became a dealer manager and finally left the dealer net in 1975 to run his own electronic design and manufacturing company. [Editor] We live right in the middle of Norfolk. The dealership that I worked for sold Fordson Tractors from the 1920's and some of t
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