Curvy o/r o/y wire

[Seeker]

Triumphs (triples and twins) exhibit similar symptoms when the Crank position sensor has failed. Might be called the pulse generator coil on the SV, not sure what the resistance should be - roughly 200 *ohms (?) but you'd need an oscilloscope to check it properly but you can at least check its resistance and see if it's properly connected. On a Triumph it comes with the stator and can't be bought separately (from Triumph).

It tells the ECU when to fire the plugs.

Theres resistance on all 3 yellow wires and the same on my old 1

[Seeker]

The resistance of the pick up coil should be 140-230 ohm measured between green and white wires (and open circuit between white and ground). If your multimeter has a peak hold option (it displays the highest voltage it sees on a moving signal) you can measure the pulses from the coil - should be greater than 3 V (chapter 7.28 in curvy SV manual)

[Seeker]

the 3 yellow wires you mentioned are part of the alternator (the stator) and are used for generating the ac voltage which goes to the rectifier/regulator to charge the battery. There's another coil that picks up the crankshaft rotation which is equivalent to the contact breakers on old bikes (if you're old enough to remember those). It produces a pulse (or several pulses) as the crankshaft rotates and tells the ECU to fire the plugs at the right time, if it doesn't produce a pulse you won't get a spark.

[Seeker]

here's picture of a stator and you can see the green and white wires for the pick up coil and the pick up coil itself just to the right of the stator

178 ohms green and white wires and 14v on white and ground and 3v when not cranking

[21QUEST]

Hello,

Engine cranking over but no spark?

That being the case, the problem is possibly a break in the red/orange wire.

Do a continuity test on the R/O wire....between connector block at ECU and front of the main loom.

If memory serves me right, the O/R wire providesome power(?) to the crank sensor.

Does that make sense to you?

I had a similar issue a few years ago....I'd try and see if I can find the thread.

O/w at ignitor 12v Yes
O/r at ignitor no volts

[Seeker]

Well, I'm baffled. I thought that any orange wire with a tracer was a switched 12v but if you look at the schematic the orange/red at the ignitor goes to the ignition switch and becomes black with white tracer which is ground. Why switch a ground, I'm missing something.

To further complicate matters, the simplified diagram shows power for the ignitor is fed via o/y wire but I can't see a o/y wire.

Its ok i have another ignitor on its way in the post so i will wait for the to arrive
Cheers anyway so far lol