I screwed up big time....

[Cormanus]

On the basis that there is no stupid question, is the battery all right?

[PowerDubs_imp]

I’m annoyed so I just bought a complete main wiring harness.

Probably won’t need it, not looking forward to installing it, but just in case!


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On the basis that there is no stupid question, is the battery all right?

Cranks fine. Dash looks normal- just no putput.


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Also going to go back to my roots- something I haven’t done in many many years… but used to be commonplace in my youth- bought a can of starting fluid.

That will narrow down whether it is a spark or fuel issue without having to mess with the spark plugs.

I’m guessing it’s fuel- but anything’s possible.


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[jtopiso_imp]

Just stating the obvious, but just in case:

Can you hear the fuelpump?
Can you try an OBD code reader?

[PowerDubs_imp]

I've never paid enough attention when the bike was working to know what the fuel pump sounds like.

Even with the tank off - there is a few seconds of buzz when the ign is turned on. Sounds normal either way to my deaf ears.

[PowerDubs_imp]

Got a chance to get down to the garage with some starter fluid- a quick spray in the airbox and the bike fired right up and idled for 5-6 seconds.

So we know the ignition is fine- and it's fuel related. Which is what I was expecting since it was the autotune box I reverse polarized.

Of course the ECU does fuel as well as spark- so we aren't out of the woods yet- but I'm guessing a melted wire in the harness. Fingers crossed.

Good thing I have this arriving on Saturday-

[Cormanus]

Fingers crossed indeed, although the prospect of dealing with that harness would not fill me with enthusiasm at all.

[PowerDubs_imp]

Not difficult- just time consuming.

But I'll unwrap the existing harness and find the fault first. Again- just time at this point.

[max]

Dubs you may have already checked this but do you have 12 volts on all four black/white wires on the fuel injectors?
They are fed from the +12 volt " fuel cut" relay.
just unclip one and check for 12 volts on the black/white wire with ignition and killswitch on.

They get pulled to ground by the ecu and have back-emf diode protection in the ecu circuit across the transistors/fet's.
If the ignition switch was off the ecu had no power and was only connected to ground and the controlling injector circuits should not be damaged because they were not activated.

Good job with the starter fluid, divides the problem in two parts right there, golden.

Do you have a circuit diagram to work things out?

[PowerDubs_imp]

I have the factory shop manual and it has wiring diagrams- but I’m not an electrical guy- I’m just a

I can certainly do basics like check the 12v you suggested- check fuses, continuity, etc- but the advanced stuff is mumbo jumbo to me.


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[jtopiso_imp]

I'd start checking if voltage arrives at the fuel pump with/without the killswitch (or just have someone listen: contact on and kill switch on/off and you can hear the fuelpump working for a second when you swith to "on").

I wouldn't be surprised if there is extra protecction not to allow a melting wire inside the fuel tank, so I'd check that circuit first.

The harness shouldn't be the weakest point on any installation: no matter what you connect it to. Fuses (or some components acting as fuses) are there to prevent wires to get too hot and avoid fires. So I don't think you'll find a melted wire. But I've been wrong before...