As for the OP's issue. One could imagine installing a simple relay that gets activated when you push on the bottom part of your rocker switches that start the generator.
I don't know if there is 12 volts at the switches but it is possible. Of course you can use the 12 volts already at the fuse on the generator and have the switch send a ground to activate the relay.
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After reviewing the schematic I can see where the 12 volts goes into the controller and is sent back out. I would imagine there is an actual mechanical relay inside the controller versus passing power through some heavy duty semiconductor device.
The strange thing is you say you can supply your own power to the glow plugs and things work fine. Are you disconnecting the wire from the controller while you do that? Or are you leaving it in the circuit?
If your controller is still connected while doing this I would change the fuse to a 25 amp one as mentioned. Yes a 5 amp difference is a lot. After changing the fuse see if it blows.
I don't know why the tech did not check the value of the fuse.
I would love to see the inside of a controller. It would really surprise me if they pass that much current through some semiconductor. But it is possible of course if they are monitoring the current draw for some reason.
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