battery dies after 2 days - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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Where does this wire go?
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Rectifier, Diagrams, etc

 
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post #1 of 9 (permalink) Old 08-23-2010, 09:06 AM Thread Starter
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battery dies after 2 days

Had a bad stator & rectifier. Replaced both. Now the battery reads 13.5 at 2500 rpm and 14.2 at 5000 rpm. However after riding for a couple of days battery is flat. Bike sputters when hot, stalls out and won't turn over.

Old bad rectifier was throwing 19 volts, so I replaced it.

Did I fry the battery (Ysusa MF)? Otherwise, any ideas as to my problem?

The bike is a 2005 with about 30,000 miles.

Duffer

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post #2 of 9 (permalink) Old 08-23-2010, 10:59 AM
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It sounds like your charging system is working fine. The battery may have a dead cell and will not hold a charge. Take it to have it tested before getting a new one though. Also check all the connections and ground cables to make sure they are tight.

01' VN750
Jardine cross over exaust
Kyriakin grips and foot pegs
Modified seat and backrest
Windshield
Luggage rack
Crash bar with Kyriakin pegs and extensions
Kumho 758 165/80-15 CT rear Dunlop 404 110/90-19 front
Coastered and air/fuel screws at 2.5 turns
Spline lube

93' VN750 getting TLC
Decals and mirrors
Coastered and air/fuel screws at 2.5 turns
ACCTs to MCCTs
Degoated with Harley mufflers
Duro 110-90-19 front 150-90-15 rear
Pick-up coils at .020
Spline lube
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post #3 of 9 (permalink) Old 08-23-2010, 11:10 AM Thread Starter
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That's kind of what I thought too.

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post #4 of 9 (permalink) Old 08-23-2010, 11:14 AM
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How old is the battery btw?

01' VN750
Jardine cross over exaust
Kyriakin grips and foot pegs
Modified seat and backrest
Windshield
Luggage rack
Crash bar with Kyriakin pegs and extensions
Kumho 758 165/80-15 CT rear Dunlop 404 110/90-19 front
Coastered and air/fuel screws at 2.5 turns
Spline lube

93' VN750 getting TLC
Decals and mirrors
Coastered and air/fuel screws at 2.5 turns
ACCTs to MCCTs
Degoated with Harley mufflers
Duro 110-90-19 front 150-90-15 rear
Pick-up coils at .020
Spline lube
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post #5 of 9 (permalink) Old 08-23-2010, 04:05 PM Thread Starter
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Battery was new in early May, however I think someone boosted the bike from a car and not sure if the car was running as I wasn't present.

Battery is still under warranty (6 months Yuasa). I am going to have it load tested at Napa and see what it turn out to be.

Duffer

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Canadian Motorcycle Cruisers Chapter 079
York Region, Ontario
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post #6 of 9 (permalink) Old 08-27-2010, 06:53 AM Thread Starter
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WE WERE BOTH RIGHT!

Replaced the battery and everything is perfect now.

Thanks for your assistance and input.


Duffer

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Canadian Motorcycle Cruisers Chapter 079
York Region, Ontario
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post #7 of 9 (permalink) Old 08-27-2010, 08:33 AM
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No problem. Have you done a voltage test to see what the volts are at the battery with the bike running? It should be 13.8+/- at idle 1100rpm and 14.8+/- at 4000+/- rpm. If the battery is fully charged don't be alarmed if the voltage drops a bit where the r/r doesn't need to put out as much volts.

01' VN750
Jardine cross over exaust
Kyriakin grips and foot pegs
Modified seat and backrest
Windshield
Luggage rack
Crash bar with Kyriakin pegs and extensions
Kumho 758 165/80-15 CT rear Dunlop 404 110/90-19 front
Coastered and air/fuel screws at 2.5 turns
Spline lube

93' VN750 getting TLC
Decals and mirrors
Coastered and air/fuel screws at 2.5 turns
ACCTs to MCCTs
Degoated with Harley mufflers
Duro 110-90-19 front 150-90-15 rear
Pick-up coils at .020
Spline lube
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post #8 of 9 (permalink) Old 08-29-2010, 01:08 PM
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Quote:
Originally Posted by baldy View Post
No problem. Have you done a voltage test to see what the volts are at the battery with the bike running? It should be 13.8+/- at idle 1100rpm and 14.8+/- at 4000+/- rpm. If the battery is fully charged don't be alarmed if the voltage drops a bit where the r/r doesn't need to put out as much volts.
hey everyone sorry to thread jack but i just did this test and my bike doesnt charge at all. how would i test the regulater/rectifier and the stator???

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post #9 of 9 (permalink) Old 08-29-2010, 02:38 PM
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No need to hijack. The info you seek is in the verses: https://www.vn750.com/forum/showthread.php?t=1146

I'm keepin' all the left over parts. I'm gonna use 'em to build another bike!
_____________________________________________
"Black Beauty"
1989 VN750 acquired December, 2008, 6,711 miles
Currently 23,298 miles

Old Blue
2001 Honda CMX250 Rebel acquired July, 2008

1987 VN750 project bike, acquired August, 2009, 33,000 miles and balancer sticking out of the case, currently awaiting attention and parts
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