Charging Problem - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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Where does this wire go?
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post #1 of 10 (permalink) Old 09-15-2010, 01:50 PM Thread Starter
Tony Bove
 
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Unhappy Charging Problem

I had my engine replaced at the beginning of this season, and ever since, I have a charging problem. Charge the battery overnight, and the bike runs for a couple of days and then won't start. Before the engine swap, I never had a charging problem.

I took it back to the mechanic, who replaced the stator (OUCH$$$). Problem NOT resolved. Replaced the battery. Problem NOT resolved. Now he's saying he can't find the problem, and I have to get my bike out of his shop because it's taking up space. (ARGH!!!!)

A friend (who seems to know more than my mechanic) tested the wiring and says that the stator is grounding out, but the stator is new, and I had the problem with the old stator too.

Anybody got any ideas on how to resolve this?

I read something about adjusting pickups. (I don't even know what that means.) Maybe that's it? Why would the problem still be there with a new stator?

Thanks, Tony.
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post #2 of 10 (permalink) Old 09-15-2010, 02:45 PM
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Stator under no circumstances should have no impedance from any of the three yellow leads to ground. If it does, it is toast. Very easy to measure and confirm. Just disconnect the three yellow leads and measure from each lead to ground, should be open or infinite.

I would confirm this before going any further. For something this easy to confirm, trust no one but yourself.

Jon

93VN750, under re-construction
vn750.com Member # 828

Rick's Stator and R/R
MF AGM Battery
Coastered
Degoated
Shaved & Jetted
Iridium's
MAC Tapered Staggered Pipes
Battery/Temp/Clock Gauge
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post #3 of 10 (permalink) Old 09-15-2010, 02:46 PM
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You tried every thing else, just as well try the r/r (regulator/rectifier.) But testing it is the best way to go. Go to the verses for help on that.

02 honda sabre 1100
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post #4 of 10 (permalink) Old 09-15-2010, 04:22 PM
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Quote:
Originally Posted by tonybove View Post
I had my engine replaced at the beginning of this season, and ever since, I have a charging problem. Charge the battery overnight, and the bike runs for a couple of days and then won't start. Before the engine swap, I never had a charging problem.

I took it back to the mechanic, who replaced the stator (OUCH$$$). Problem NOT resolved. Replaced the battery. Problem NOT resolved. Now he's saying he can't find the problem, and I have to get my bike out of his shop because it's taking up space. (ARGH!!!!)

A friend (who seems to know more than my mechanic) tested the wiring and says that the stator is grounding out, but the stator is new, and I had the problem with the old stator too.

Anybody got any ideas on how to resolve this?

I read something about adjusting pickups. (I don't even know what that means.) Maybe that's it? Why would the problem still be there with a new stator?

Thanks, Tony.
Welcome to the Vulcan madness Tony. Sorry to hear of the ongoing charging problem with your scoot.

Adjusting the ignition signal pick-up coils will not have any effect on the charging system. All that adjustment does is move the pick-up coils a few thousandths of an inch closer to the outside circumference of the rotor (0.018-0.020" air gap) in order to receive a stronger signal from the ignition trigger magnet as it rotates past them. This creates a fraction of a volt more signal to the ignitor and ignition coils to fire the spark plugs. If believe the pick-up coils signal is very low, something on the order of 1 or 2 volts, so a small increase can make big improvement.

Solve the charging issue first, and don`t worry about doing this mod unless you have ignition firing problems.

Gordon

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

H-D windshield
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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 #5 of 10 (permalink) Old 09-19-2010, 03:53 PM
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Stator Wires -Cold Check FAIL!

Bad Stator Winding?

Stator Winding Cold Checks

A to Ground .3 Ohms A to B .5 Ohms
B to Ground .7 Ohms A to C .5 Ohms
C to Ground .7 Ohms B to C .5 Ohms

Is it safe to say that the Stator Wire 'A' is Shorted to Ground?

The STAR configuration means if one lead is Shorted to Ground, then they
all show a Short to Ground, although slightly higher as they have to pass through the additional coil to get to the Ground.

Stator Winding HOT Checks

A to B 1.4 VAC
A to C 1.4 VAC
B to C 34 VAC

9 Years and 6 Months = Shorted Stator Winding.

BTW I disconnected the shorted one and tested the charging system. 13.85V at idle, less as RPM's increased.

I want to offer my sincere gratitude and thanks to this site and the riders contributing to it for reducing my diagnostic time and co$t. Thank You

Last edited by w4nmh; 09-19-2010 at 04:26 PM.
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post #6 of 10 (permalink) Old 09-21-2010, 12:29 PM
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Exclamation Stator Baked by Hot Oil?

The mechanic were I bought the bike said in his experience it is the use of the side stand that allows hot oil to pool on that side of the engine, thus "Baking" the Stator and in doing so breaks down the enamel coating on the windings.

He strongly urges riders with a center stand to use it instead.

Any thoughts on this?
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post #7 of 10 (permalink) Old 09-21-2010, 03:57 PM
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It's not beyond the realm of possibility. Heat is bad for stators.

Jon

93VN750, under re-construction
vn750.com Member # 828

Rick's Stator and R/R
MF AGM Battery
Coastered
Degoated
Shaved & Jetted
Iridium's
MAC Tapered Staggered Pipes
Battery/Temp/Clock Gauge
Stainless Steel Brake Lines
Dunlop D-404's
23,XXX miles and holding pending gasket change (underway!!!)
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post #8 of 10 (permalink) Old 09-21-2010, 04:27 PM
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Quote:
Originally Posted by 93VN750 View Post
It's not beyond the realm of possibility. Heat is bad for stators. Jon
That's why I run a full 4L of oil. Oil acts as a coolant. Now if I'd get off my butt and build a oil cooler.

DT

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post #9 of 10 (permalink) Old 09-22-2010, 11:33 AM
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Cool :notworthy When is too much, too much?

Quote:
Originally Posted by dirtrack650 View Post
That's why I run a full 4L of oil. Oil acts as a coolant. Now if I'd get off my butt and build a oil cooler. DT
Is there a risk of 'blowing' a seal or gasket some were with "extra" oil?

Harley air-cooled bikes have the oil-cooler bladders, ouch they got HOT!
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post #10 of 10 (permalink) Old 11-07-2010, 10:29 AM
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For one thing I wouldn't take my bike back to that "replace parts untill you find the problem" Grease Monkey!!

Current Ride...2008 Yamaha FJR1300

Past Pleasures...
2007 Suzuki Bandit1250
2006 Triumph Sprint
2004 Kawasaki ZRX1200
2002 Kawasaki ZRX1200
1996 Kawasaki Vulcan 750
1984 Honda V65 Sabre 1100
1986 Kawasaki Vulcan 750
1982 Suzuki GS750EZ
1974 Suzuki GT380
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