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Originally Posted by stuvx
Inetd, are you sure about the 5V supply voltage to the coils? I'm using Alldata and seeing that battery voltage is supplied to terminal 15 of the coil's primary winding and primary ground is switched on terminal 1. I don't think a 5V supply to a primary winding could induce a secondary spark strong enough to support combustion.
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Years ago and maybe still true today it was not uncommon to use a balast resistor to the coil primary. This resistor would allow full battery voltage to the coil during start up but cut it down to about half when the resistor/engine warmed up. So 5 volts may very well be sufficient for these newer coils it al depends on design.
John Roncallo