Charging problem cont. - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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Where does this wire go?
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post #1 of 14 (permalink) Old 08-23-2008, 09:26 PM Thread Starter
 
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Charging problem cont.

So back to square one. I'm still having a charging issue. I've replaced and moved the R/R. I've replaced the battery (to a nonMF one for now because I will get the warrenty replacement on the MF one) and I've tested the stator and it comes out fine as far as I can tell. The problem is I'm still not holding a charge.

With the bike off I get a charge of 12.6v. With it running it drops to 12.5 but will increase with throttle and by the time I get back from a 10 mile ride (about 20 minutes) it will be down to 12.2volts when I turn the bike off. Is there anything I should be looking for that anyone can think of? I'm sure there's something I'm not catching...

TIA
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post #2 of 14 (permalink) Old 08-23-2008, 10:33 PM
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These readings sound a bit low to me. With the bike rev'd to 2500 what kind of voltage do you get at the battery? and, with the bike rev'd to 5000 what is the voltage?

Chris
Wayne, NJ
1989 VN750-A5
VROC #27781
-Replaced/Fused Stator & Replaced/Relocated R/R (15K mi.)
-MF Battery
-De-Goated/Re-goated
-Coastered
-Splines Lubed
-Stebel Nautilus Horn
-AutoMeter 2" VOM
-Silverstar Headlight
-Refinished Gauge Rings and Mirrors(Flat Black)
-Refinished Swingarm/Lubed Pivots
-K&S Turn Signals Clear Cover/Amber Bulb
-Kenda Kruz 110/90-19 front 170/80-15 rear
-Clear Alternatives LED tail light
-Plexifairing III
-Willie & Max Saddlebags and SissyBar Bag
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post #3 of 14 (permalink) Old 08-23-2008, 10:36 PM Thread Starter
 
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To 2500 I'll get 12.6 and 12.8 at 5500.
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post #4 of 14 (permalink) Old 08-23-2008, 10:45 PM
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This is definitely low. You should be seeing around 13.5 @ 2500 and about 14.8 @ 5000. I know you said you tested the stator, but just to have all of the details:

(engine off) what is the resistance on each pair combo of disconnected stator leads?
(engine off) What is the resistance on each lead to ground?
(engine running) what is the AC voltage on each pair combo of disconnected stator leads @ 5000 RPM?

Chris
Wayne, NJ
1989 VN750-A5
VROC #27781
-Replaced/Fused Stator & Replaced/Relocated R/R (15K mi.)
-MF Battery
-De-Goated/Re-goated
-Coastered
-Splines Lubed
-Stebel Nautilus Horn
-AutoMeter 2" VOM
-Silverstar Headlight
-Refinished Gauge Rings and Mirrors(Flat Black)
-Refinished Swingarm/Lubed Pivots
-K&S Turn Signals Clear Cover/Amber Bulb
-Kenda Kruz 110/90-19 front 170/80-15 rear
-Clear Alternatives LED tail light
-Plexifairing III
-Willie & Max Saddlebags and SissyBar Bag
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post #5 of 14 (permalink) Old 08-23-2008, 10:56 PM Thread Starter
 
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resistance to each pair of stator leads (off but warmed up) was 0.6 each
Resistance to ground was infin. on all
AC voltage was 70v +-5 on all leads

I wonder if something is staying on or if I have a bad ground somewhere or what.... I really am lost on this.
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post #6 of 14 (permalink) Old 08-23-2008, 11:05 PM
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Well the good news is that the stator sounds fine based on those readings! I would suggest doing a diode test on the RR just to make sure that it is good. After that I would suggest putting a multimeter in line with the battery to check the amps with the bike off. It should be 0. If you are seeing a power draw then you have a problem somewhere in the wiring.

The problem for me though, are the readings at the battery. They are low. So I am guessing either the RR has a problem, or there is an issue in the wiring between the RR and the battery. Have you opened up the loom and traced the wires from the RR to the battery?

Also, as I think about this, I am remembering a bunch of posts recently regarding the brown wire causing some major headaches in the charging system. I think SlimVR was the one. (sorry Slim if I am remembering poorly!)

Chris
Wayne, NJ
1989 VN750-A5
VROC #27781
-Replaced/Fused Stator & Replaced/Relocated R/R (15K mi.)
-MF Battery
-De-Goated/Re-goated
-Coastered
-Splines Lubed
-Stebel Nautilus Horn
-AutoMeter 2" VOM
-Silverstar Headlight
-Refinished Gauge Rings and Mirrors(Flat Black)
-Refinished Swingarm/Lubed Pivots
-K&S Turn Signals Clear Cover/Amber Bulb
-Kenda Kruz 110/90-19 front 170/80-15 rear
-Clear Alternatives LED tail light
-Plexifairing III
-Willie & Max Saddlebags and SissyBar Bag

Last edited by ChrisC; 08-23-2008 at 11:05 PM. Reason: correction
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post #7 of 14 (permalink) Old 08-23-2008, 11:07 PM
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One more thing...Have you checked/cleaned all of the connections? Dielectric grease after a good cleaning is not a bad idea either. Just thinking out loud here.

Chris
Wayne, NJ
1989 VN750-A5
VROC #27781
-Replaced/Fused Stator & Replaced/Relocated R/R (15K mi.)
-MF Battery
-De-Goated/Re-goated
-Coastered
-Splines Lubed
-Stebel Nautilus Horn
-AutoMeter 2" VOM
-Silverstar Headlight
-Refinished Gauge Rings and Mirrors(Flat Black)
-Refinished Swingarm/Lubed Pivots
-K&S Turn Signals Clear Cover/Amber Bulb
-Kenda Kruz 110/90-19 front 170/80-15 rear
-Clear Alternatives LED tail light
-Plexifairing III
-Willie & Max Saddlebags and SissyBar Bag
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post #8 of 14 (permalink) Old 08-23-2008, 11:42 PM
Now what
 
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This is probably too easy but here goes: there's a white wire with a red stripe that connects the positive pole of the battery to pretty much everything in the bike. In the wire is one of those bullet connectors. It's easy to get to so I'd pull it apart, clean it up and put it back together with some dielectric grease. Then check the voltage at the battery. Might work. Don't cost nuthin.

'04 750A- and loving it!
VROC 13864
Using a Purlator One PL14610
"Sixth gear? I don't need no stinkin sixth gear!"
If someone throws you under the bus-remember to tuck and roll
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post #9 of 14 (permalink) Old 08-24-2008, 12:26 AM Thread Starter
 
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I will probably end up pulling the wires apart and doing DG on all of them. The R/R is brand new and tested fine when I got it. I'll have to check the red/white wire as well and see how that it. Man this is such a PITA.
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post #10 of 14 (permalink) Old 08-24-2008, 09:32 AM
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Electrical issues really can be PITA!

Chris
Wayne, NJ
1989 VN750-A5
VROC #27781
-Replaced/Fused Stator & Replaced/Relocated R/R (15K mi.)
-MF Battery
-De-Goated/Re-goated
-Coastered
-Splines Lubed
-Stebel Nautilus Horn
-AutoMeter 2" VOM
-Silverstar Headlight
-Refinished Gauge Rings and Mirrors(Flat Black)
-Refinished Swingarm/Lubed Pivots
-K&S Turn Signals Clear Cover/Amber Bulb
-Kenda Kruz 110/90-19 front 170/80-15 rear
-Clear Alternatives LED tail light
-Plexifairing III
-Willie & Max Saddlebags and SissyBar Bag
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