Voltage @ coils - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 12 (permalink) Old 08-17-2011, 12:25 AM Thread Starter
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Smile Voltage @ coils

86 VN750 A2....lost rear coil I cleaned every electrical connector/connection i could see with the seat removed. Measured 5.8 V at rear coil (wires removed) and 11.75 V at front coil. (Battery @ 12.4 V ) Appears to be a faulty Igniter Module.. Looking for a second opinion.... any help ?

'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 #2 of 12 (permalink) Old 08-17-2011, 05:52 AM
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Someone check me, but aren't there supposed to be two readings (resistance?) to check the coils? Wait until someone else weighs in, but I think there are two windings and you've got to measure them both to ascertain whether a coil's gone bad. Regardless, I have spare (used) coils and a couple of igniters (I think one's new), so if something needs to be replaced feel free to shoot me a PM.

C
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post #3 of 12 (permalink) Old 08-17-2011, 06:23 AM Thread Starter
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Smile

Rear coil (#2) measures 2.1 & 2.2 Ohms
Front Coil (#1) measured 2.1 & 2.2 Ohms
[email protected] wire connections

'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 #4 of 12 (permalink) Old 08-17-2011, 08:14 AM
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You have a broken wire or bad splice/connection. The power to the coils comes from the battery, not the ignitor. I would suggest you do the coil mod found here in the forum.
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post #5 of 12 (permalink) Old 08-17-2011, 10:00 AM
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Quote:
Originally Posted by WilliamTech View Post
Rear coil (#2) measures 2.1 & 2.2 Ohms
Front Coil (#1) measured 2.1 & 2.2 Ohms
[email protected] wire connections
Found my service manual:

Primary resistance = 1.8-2.2 ohms
Secondary resistance = 19,000 - 29,000 ohms

C
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post #6 of 12 (permalink) Old 08-17-2011, 04:40 PM
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Quote:
Originally Posted by dariv View Post
You have a broken wire or bad splice/connection. The power to the coils comes from the battery, not the ignitor. I would suggest you do the coil mod found here in the forum.
X2^^^^^^
Coil mod link:
https://www.vn750.com/forum/showthread.php?t=17276

Gordon

1991 VN 750 -"Cosmic Lady" or "Bad Girl"?
Purchased May 16, 2008
Approx.19,300km (12,000 miles)

H-D windshield
Relocated R/R
MF-AGM battery
Fiamm Freeway Blaster horns
F&S luggage rack and engine guard
Kury Offset Hiway pegs
July 13, 2016, Riding on the DARKSIDE now, Classic Radial 165/80-15


TOP TEN THINGS A NEW RIDER/OWNER SHOULD DO. Click on link.
https://www.vn750.com/forum/11-vn750-general-discussion/9127-top-ten-items-you-would-suggest-new-owner-do-his-new-ride.html
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post #7 of 12 (permalink) Old 08-17-2011, 05:07 PM
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Just for a test. You can run a wire direct to the coil from the + side of the bat and see if the bike starts and run good.

02 honda sabre 1100
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post #8 of 12 (permalink) Old 08-17-2011, 06:06 PM Thread Starter
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tried that....

NiteRider: Just for a test. You can run a wire direct to the coil from the + side of the bat and see if the bike starts and run good.

Dariv: You have a broken wire or bad splice/connection. The power to the coils comes from the battery, not the ignitor. I would suggest you do the coil mod found here in the forum.

NiteRider, Tried that, could not keep it running at idle, would not take any throttle at all.

Dariv: When measure terminal voltage @ coil terminals: (battery @ 12.4 V) Front coil: Solid 11.6 V Rear coil: 10.1 V which drops to 5.6 V within 8-10 seconds. By my Schematic rear coil receives its ground from the igniter. Checked ground to Igniter via plug...all is perfect.

Q: Seems to me the Igniter is providing a bad ground to rear coil (from within the igniter). Only front cylinder is firing, when I ran direct battery to coil, rear cylinder had some spark (appeared weak) wanted to run with starter, would not take any throttle.

u all been a great help thus far, but problem still exists...
Help !

'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; 12-10-2012 at 08:35 AM.
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post #9 of 12 (permalink) Old 08-17-2011, 07:40 PM
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Have you tried spark plugs?
Change them around.

02 honda sabre 1100
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post #10 of 12 (permalink) Old 08-18-2011, 12:00 AM Thread Starter
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LOL ...i should have thought that ! I'll try that.

Rear coil: When I measure coil 12 V lead to Chassis / battery ground......12 + V.... when measuring via 2 coil leads 9V down to 5+ V with 5-6 seconds.

? ? ?

'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!
WilliamTech is offline  
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