Quote:
Originally Posted by scicala
I don't think there would be any resistance in this wire. Any resistors, if any would be to the coil +side.
Sal
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The primary ignition circuit is a special circuit designed to handle the voltages in the circuit....
Example :
In a 12 volt circuit (easier for me to explain) the battery voltage is 12.2 volts after sitting overnight. We have a 1.5 ohm coil and a 1.5 ohm resistor , when the engine starts each resistor drops approx 6 volts allowing a small voltage to cross the ignition contacts. ( amps is another story as amps are constant in a series circuit) . Thats cool until the alternator starts to charge and we then have to deal with 14.6 volts. Now the resistors heat up and offer slightly more resistance but the voltage at the contacts now is 2-3 volts. The primary lead is a finely stranded wire designed to drop this excess voltage to as close to zero as we can get...
Heres a couple examples laying on my desk from a Mustang and the NAPA buyers guide showing these leads . Offen times this lead changed every model year in a effort to make the points last longer . In our chevy conversion we buy a new lead for every unit from Standard Motor products.
The typical "hot rod guy" cuts this lead and replaces with new 12-14 gauge lead wire and upsets the entire balance of the system!!! Thinking this is the thing to do !!!