Dang it!! The first school IH sent me to was on electrical systems and they must have screwed up and got it wrong!
Or maybe not.
You would be correct if Mother Harvester had gone along with the way that Delco Remy shows the 10 DN system wired, but IH must have thought they had a better idea. The difference is in how the resistor is wired into the circuit. That change also required a change in how power is supplied to the #3 wire.
Like the #4 wire, the #3 wire also comes from the ignition switch. If it were hot all the time there would be a back feed through the external resistor and charge lamp to the ignition switch which would continue to power anything else (fuel gauge, ignition coil, cab relay) connected to that side of the switch.
The diagram below shows how IH wired there machines when using a charge light and 10 DN alternator with external regulator.
This diagram shows what Delco Remy has in their service materials
I didn't say it was the best way, only that it would work. As long as he is going to replace the wiring harness the best solution is to use a custom made harness designed to with a 10 SI rather than a 10 Dn.
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