Topic: Re: OT Kinda-itsa Ford 65 Mustang
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When the starter motor is engaged, the system voltage drops to about 6 volts, this is due to the high amp draw on the 12 volt battery. The resister drops the normal running voltage to 6 volts. Ford did this so a 6 volt coil can supply the 20,000 volt spark needed to fire the spark plugs. Two wires are attached to the start switch, the one that goes to the start terminal has the non-resister wire, the second wire with the resister goes to the run terminal on the start switch.
Some time during the mid 1950"s Ford stopped using the ceramic resister and used a resister wire which is a little hard to identify in the wiring. All this was to keep a constant voltage at the coil during engine start. If the resister wire is broken or shorted the engine will start only when the key is in start mode, then will dye in the run mode. If the non-resistor wire is broken the engine will not start except if the key is back to run mode when and if the coil fires as you let off the start mode. So the moral of the story is both wires must be intact. Also, using a newer model 12 volt coil will burn you points in a very short time.
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