Quote:
Originally Posted by Nitrorye
found it has power on the red wire at one of the coils, and no signal at the black wire.
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This is correct. Like any circuit, one wire goes to +12v (red) and the other (black) to... ???
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GROUND!!!
Black wire is open (disconnected) and grounded momentarily by ignition-box to fire coil. Can't see signal without oscilloscope. Similar to headlight circuits on most import cars, +12v is sent to bulb full-time. Then headlight-switch grounds other side of bulb when you want them on.
Also there should be +12v power on red wire of both coils. It's exact same wire leaving kill-switch, just gets split into 2 with Y-connection on way to coils. Better check that this Y didn't get disconnected to one side.