coil question - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
Electrical
Where does this wire go?
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post #1 of 15 (permalink) Old 04-14-2014, 06:33 PM Thread Starter
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coil question

hello everyone, I have a quick question rear coils firing I guess the spark looks good front coils no spark. they both have current going to them.
primary check ohm range front and back normal
secondary readings are as follows
front 31.7
rear 30.8
normal range should be between 19-29 is the 2 ohm difference a big deal and why if the is juice and readings not bad the front not firing? maybe someone can give me some help.
one more thing the 3 yellow wires coming from the stator cover to the 3 yellow wires by the rear coil if they are all yellow with no stripes just plug em in? or is there a sequence to them I am not seeing?

Last edited by Spiritwalker; 04-14-2014 at 06:35 PM.
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post #2 of 15 (permalink) Old 04-14-2014, 06:38 PM
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Țhree yellow wires are interchangeable. No specific order. I'd bet you slimvulcanrider will pop up and chime in on your electrical issue.
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post #3 of 15 (permalink) Old 04-14-2014, 06:41 PM
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Maybe something to do with your pulsers.
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post #4 of 15 (permalink) Old 04-14-2014, 06:49 PM Thread Starter
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thanks Crowley I thought the yellows was self explanatory but figured I would ask any ways haha tomorrow I will get back into book again and see if I can check the other components what are the pulsers ?
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post #5 of 15 (permalink) Old 04-14-2014, 06:51 PM
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Try swapping your coils front to rear.

Or run a power wire straight from the battery to the front coil positive terminal.

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Last edited by Big Nick; 04-14-2014 at 07:54 PM. Reason: Added advice.
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post #6 of 15 (permalink) Old 04-14-2014, 07:13 PM
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Quote:
Originally Posted by crowley1027 View Post
Maybe something to do with your pulsers.
Quote:
thanks Crowley I thought the yellows was self explanatory but figured I would ask any ways haha tomorrow I will get back into book again and see if I can check the other components what are the pulsers ?

He is referring to the pick-up coils mounted @ 0.020 " from your rotating flywheel(thanks crowley).


'86 VN750 13,700 mi -Stock
-Purchased 2008 w/8800mi
Replaced ALL Cables . Kuryakyn LED Voltmeter
SilverStar Ultra 9003/HB2 H4 Headlamp, Jardine Fwd Controls,
Iridiums DPR7EIX-9 & Wires, Tuxedo Mod, Coil Mod, P/U Sensor Mod, Fork Seals,
Splines Lubed - 11/4/2012 - MF AGM Battery
Additional Flashing LED Brake Light on Trunk
Dampers went out @ 13+K !
After TOC MCCT's..... so amazingly quiet I discovered a rattling heat shield on my stock exhaust !
...have a vulcan good day!

Last edited by WilliamTech; 04-14-2014 at 07:33 PM.
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post #7 of 15 (permalink) Old 04-14-2014, 07:15 PM
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On left side of vehicle, there is a cover where the three yellow wires come out. It's held by three screws. Behind that, you have the pulsers. They are two little square boxes that are held in at about 9 o clock and 11 o clock. The function of these (I believe) is to transfer energy from the rotor to the flywheel. If one of those is shot, you won't get spark. Swapping the coils would tell you if the coils are good or not.
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post #8 of 15 (permalink) Old 04-14-2014, 07:39 PM
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Quote:
Originally Posted by crowley1027 View Post
On left side of vehicle, there is a cover where the three yellow wires come out. It's held by three screws. Behind that, you have the pulsers. They are two little square boxes that are held in at about 9 o clock and 11 o clock. The function of these (I believe) is to transfer energy from the rotor to the flywheel. If one of those is shot, you won't get spark. Swapping the coils would tell you if the coils are good or not.
Be aware, if troulble shooting using this method, physically moving/swapping them without changing the electrical hook-ups....will not work (bike will not run ...spark timing changed).
In other words, you must change the electrical connections as well when performing the physical swap.
hth

'86 VN750 13,700 mi -Stock
-Purchased 2008 w/8800mi
Replaced ALL Cables . Kuryakyn LED Voltmeter
SilverStar Ultra 9003/HB2 H4 Headlamp, Jardine Fwd Controls,
Iridiums DPR7EIX-9 & Wires, Tuxedo Mod, Coil Mod, P/U Sensor Mod, Fork Seals,
Splines Lubed - 11/4/2012 - MF AGM Battery
Additional Flashing LED Brake Light on Trunk
Dampers went out @ 13+K !
After TOC MCCT's..... so amazingly quiet I discovered a rattling heat shield on my stock exhaust !
...have a vulcan good day!
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post #9 of 15 (permalink) Old 04-14-2014, 08:00 PM
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William - if coil one fires and coil two does not... Leave the plugs and wires attached and switch the coils (the two leads at each coil, moving them to the other coil) - I thought that if the pulser was the issue, it would fire coil 2 but not coil 1
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post #10 of 15 (permalink) Old 04-14-2014, 08:03 PM
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Quote:
Originally Posted by crowley1027 View Post
William - if coil one fires and coil two does not... Leave the plugs and wires attached and switch the coils (the two leads at each coil, moving them to the other coil) - I thought that if the pulser was the issue, it would fire coil 2 but not coil 1
...swap coils physically....thus proving both coils are good.

I was speaking of the pick-up coils in previous post.


'86 VN750 13,700 mi -Stock
-Purchased 2008 w/8800mi
Replaced ALL Cables . Kuryakyn LED Voltmeter
SilverStar Ultra 9003/HB2 H4 Headlamp, Jardine Fwd Controls,
Iridiums DPR7EIX-9 & Wires, Tuxedo Mod, Coil Mod, P/U Sensor Mod, Fork Seals,
Splines Lubed - 11/4/2012 - MF AGM Battery
Additional Flashing LED Brake Light on Trunk
Dampers went out @ 13+K !
After TOC MCCT's..... so amazingly quiet I discovered a rattling heat shield on my stock exhaust !
...have a vulcan good day!

Last edited by WilliamTech; 04-14-2014 at 08:18 PM.
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