Electrical issue

[wheninroem]

Hey, I'm new to the forum. I have recently purchased a gs500 protect (more of a basket case) and for the life of me cannot get any spark.
The bike turns over and the lights function.

I have tried two wiring harnesses, three cdi's, two pulse generators and two sets of coils to no avail. I have also checked the resistances of all parts and all check out. The only electrical component I have not checked out is the starter as I'm not really sure how to do such.

Also the bike is a 1991 with a 2008 motor.

I really hope someone on here has an idea as to what the problem might be.

[mr72]

Just spark, right?

Trace the problem methodically, rather than throwing parts at it.

1. check the signal generator. It's under the round cover on the right side of the engine. I'd pull the cover and make sure the part is there (has two hall effect pickups on it) and the rotor in the middle is turning and everything is good there. On that '08 motor you will have some kind of ignition advancer on there. Anyway, check this stuff out. Put an ohm meter across each of the pickups. A search should yield the factory spec for DC resistance of those parts.
2. Check the plug at the end of the signal generator, make sure it's making a connection. Follow the wire down the harness and verify the other end (igniter) shows continuity.
3. The ignitor (you say CDI) is kind of a black box, tough to test without an oscilloscope. If you have a new one, assume it works ? I'm not going to walk you through testing it, but I'm sure Sledge will show up and give you pointers. At the very least, make sure it gets power when the ignition switch is in RUN.
4. Verify there is continuity in the wiring and connectors between the ignitor and coils.
5. Check the DC resistance of the coils with the ohm meter. Google for spec, verify in spec.
6. Verify the coil is not grounded somehow
7. Verify continuity of the ignition switch, kill switch, side stand switch, etc. I don't have the wiring diagram in front of me but if you do, then you can know what to check and follow the wiring to check it all.
8. Verify the plug wire ? Maybe you have the wrong one? Missing the little screw-off part on the top of the plug? Who knows. I'd check it.
9. Make sure the engine block is at ground potential.

That said, since you have replaced stuff and it still doesn't work I think I'd suspect the ignition switch, kill switch, connectors, wiring, etc. Both cylinders bad has to be either a fundamental bad thing (no ground to engine block, nonfunctional ignitor, bad wiring to the ignitor, sig-gen disconnected, etc) or a wrong part somewhere common to both cylinders ... wrong plug wires, wrong ignitor, no power to ignitor, etc.

If I had to guess, your problem is a shorted kill switch or bad ignition switch. Or you forgot to connect the signal generator.

[wheninroem]

I'm sorry I wasn't clear first. I have tested the resistance of both coils the signal generator, the ground cable, as well as cleaned all connectors. All of my values are within the proper range I believe. Should I post those? I'm also getting 12v to the coils but it is constant. I have bypassed the clutch switch and the surreal safety switch is working I believe. Also I currently have the single pickup pulse generator on the bike as of now. Ive also checked for continuity there as well... And the actual magnet appears to be in good shape is there anything else I should look for there? Also thank you for your response.

[mr72]

The signal at the coil should not be a constant 12VDC. How in the world would it spark? That to me points to either a wiring error (+12VDC connected to the coil) or a bad ignitor.

[wheninroem]

Alright I'll check the wiring and see if that could be the cause. Thank you

[gregjet]

The electricals are not compatable. The early engines use 2 reluctors and the appropiate ECU and the later a single signal generator. A heap of other things are not compatable. So have you the wiring for the 2008 or are you trying to use the extant wiring. Also te signal position is different but that won't stop a spark.
A 2008 motor is going to need a compatable wiring loom or start from scratch.
I can't remember off the top of my head but the coils may also not match ( different impedence/wiring/gain)
Just a thought.

[wheninroem]

As of now everything electrical on the bike is off of the 08. With the exception of the left coil and starter. And I'm still getting the same issue as with everything off of the 91.