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Dunk..... ...them 70's were using the same frontmount squarecan ignition coil trick. Bypass the resistor with special starter solenoid contacts during start-up. Start-up can really drag a battery down, its a chemical reaction thing. While you think yer battery is providing 12v to yer starter, it really mightbe dragged down to 8-volts. 8v on a 12-volt coil ain't gonna gittcha hott-enuff sparkies to sparkle. So by essentially using a coil designed for 8v (say) and protecting it by an external resistor that is switched out when starting, you gitt hott-enuff sparkies for starting HI-COMPRESSION engines of the 70's. Then when you lett-upp on yer twist-to-start ignition yer already running engine will continue to run on because the solenoid ...or... ignition switch as re-inserted this necessary 12-to-8v resistance in the coil circuit. Basically, its cheaper to do electrical "tricks" than use a bigg-enuff battery that won't drag-down for just that 1-min of starting time. Now then, because of EMISSION law requirements, most sparkie systems have been transistorized and HOTTED-UP to meet gov't regulations for SMOG and LONG LIFE. And the redesign makes automatic solidstate allowances for loaded battery problems. Sometimes bureaucrats are semi-helpful..... ...Dell
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