no power to ignition coils - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 8 (permalink) Old 04-05-2020, 12:22 AM Thread Starter
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no power to ignition coils

Im fixing up a 1987 VN750 with 1700 original miles. It has air fuel and compression but no spark. I tested the positive wires to the ignition coils and neither of them are getting power with the ignition on, or turning over. All fuses are good. From what I have read Im thinking it could be a problem with my CDI. Im fairly versed with auto mechanics but this is my first stab at a motorcycle. Side note, I have to play with the ignition for a minute before I can get the push button start to work, if I had a faulty killswitch could the bike still turn over and not get spark?
I disconnected the kickstand safety so that shouldnt be an issue.
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post #2 of 8 (permalink) Old 04-05-2020, 04:36 AM
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post #3 of 8 (permalink) Old 04-05-2020, 09:04 AM
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Could be the ignition switch ... Look up how to clean the "puck" here in the forums.

Simply unplugging the kickstand might be the same as having the kickstand down. Memory is fuzzy on that. Might need to do some wire splicing.

It won't crank the starter if the kill switch is off.

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post #4 of 8 (permalink) Old 04-05-2020, 10:29 AM
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right, need to splice the 2 kickstand wires together to bypass it. open circuit kills the ignition

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post #5 of 8 (permalink) Old 04-05-2020, 04:11 PM Thread Starter
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I tried cleaning the puck this morning and nothing. The kickstand safety is basically a pushrod that is pushed in when the kickstand is down. I just unbolted it so it’s dangling with the pushrod out as if the kickstand was up. Any other thoughts?
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post #6 of 8 (permalink) Old 04-05-2020, 08:59 PM
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Could find the wire that supplies voltage to the CDI, and test for voltage with the key on and also while cranking.

Side note - I came up with the Two Wire mod when my start button went dead.

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post #7 of 8 (permalink) Old 04-05-2020, 09:58 PM
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Also, if you find no power going into the CDI, check the same wire at the Junction Box. My fan stopped working once because of a loose spade in the JB plug. Had to smash it so it fit tighter.

Since the coils are by ground, the voltage supply for ign coils may come directly from the JB also. You may find a ire color used on both JB plugs, so you have to check the correct JB plug.

Sorry, right now, I'm not able to research which wire color you're looking for.

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__________________________________________________ ____________
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post #8 of 8 (permalink) Old 04-06-2020, 12:03 AM
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For what it's worth, the kill switch also kills power to the starter button.

You can safely pull the plugs out of the IC and check the red wire (v+) has a good solid voltage when the ignition is on, and check that the black/white wire has a good solid path to ground when the kickstand/neutral/clutch switches are appropriately closed.

Have you actually checked for spark at the plugs when cranking?

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