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Originally Posted by inetd
Remember, the plug wires on the Merc 5L V8 are low voltage going to the plugs/coils. I think only 5 volts according to WIS.
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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.