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Starting problem, no spark

  • Thread starter Thread starter geisterfahrer
  • Start date Start date
Steve,

Thanks for the explanation on the diode. After studying the schematic a little more closely, I can see that the diode allows power to the starter relay if the transmission is in neutral, otherwise the clutch switch has to be closed.

So, I guess that wasn't it after all. It only prevents the engine from cranking, it does not disable the ignition, unless there is more going on in the starter relay than is indicated by the schematic. There was never any problem cranking the engine.

I must have accidently fixed something somewhere else. I'm now thinking that having disassembled and cleaned the kill switch may have been the key, since the primary voltage to the coils goes directly through it. It was fairly dirty, and I seemed to be getting intermittent continuity through it when I tested it before cleaning.

Thanks again, everybody!
 
Steve said:
There are probably a couple of items that share a ground, and the diode helps sense which one.

There is a diode there to keep the signals straight so that a deployed side stand does not turn on the oil pressure light.

The clutch diode on the Nighthawk might share something similar.
Click to expand...

geisterfahrer said:
Steve,

Thanks for the explanation on the diode. After studying the schematic a little more closely, I can see that the diode allows power to the starter relay if the transmission is in neutral, otherwise the clutch switch has to be closed.
Click to expand...
geisterfahrer,
the clutch switch is on the ground side, and I suspect, the diode is for the grounds on the neutral light, gear position indicator, and the gear position switch. BUT I cannot read the components, in the starter relay.
you can remove the diode, that will give you the answer.
 
Last edited:
rustybronco said:
BUT I cannot read the components, in the starter relay.
Click to expand...

rusty, the diagram in the Clymer manual is not much clearer than the scan I posted, however it appears to be the same as the setup on my '07 Nighthawk (see new scan) with the exception of the wire colors. On the '83 Nighthawk diagram, the wires are (l - r) R, R/Y, R/G, R/W. On the '07, the R/G and R/W are reversed.
 
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