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I have an older Onan generator Model 3MTK-1R-1G that i'm in need of
wiring
diagram and sevvice manual.


If you Onan is like mine, the wiring diagram is printed on the inside of the
control box lid.

This should be obvious, but did you check the fuses? Mine has three fuses:
if the main fuse is blown the unit won't even crank. There is another fuse
for the choke heater, and the third fuse is part of the fuel pump and I
believe ignition circuit.

You should also check the over temperature and oil pressure shut down
switches, although I believe that if these were bad the motor would start
but would stop as soon as you let go of the starter switch.


Rod McInnis