DuraSpark, Ford TFI current
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DuraSpark, Ford TFI current



OK, with the ignition ON engine not running, I measured 4.8 amps
through the coil (7.7V across the 1.6 ohm ballast resistor).

Sounds about right to me. That's 36 watts -- about as much as a
soldering iron, so there you go. Better heatsink that little
S.O.B. ballast. Mine's perched on the spring tower, I think I'll
move it so it sits flat on the fender to suck up the heat.







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