Trouble cranking over - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
Electrical
Where does this wire go?
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post #1 of 13 (permalink) Old 06-28-2009, 03:55 PM Thread Starter
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Trouble cranking over

I just bought a new battery to try and fix my cranking problem. It would spin over very slowly as if the batt. was dead. I jumped it using my lawn tractor and it spun over just fine, nice and fast. The new battery is doing the same thing. But heres the puzzler, the battery charger says its fully charged, and it will spin over fine sometimes, then other times it will barily crank over the first couple revolutions, then speed up. could the new battery i bought be defective? or do i have some other problem.

1986 Vn750
18,800 miles, and counting
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all fluids changed
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2001 Vn750
13,100 miles, and counting
spline lube
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Shinko 170/80
rear end oil change
aftermarket mirrors
windshield
otherwise all stock
*anticipated mods*
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post #2 of 13 (permalink) Old 06-28-2009, 04:00 PM
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Check electrical connections. It could also be a starter soleniod going bad. Sometimes the starter brushes wear down and can cuase that symptom. Hopefully it is just a bad connection. Could be anywheres from the starter switch to to the key switch, hard to pin point it.

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post #3 of 13 (permalink) Old 06-28-2009, 04:08 PM
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Ditto on niterider's comments. But for specific locations, make sure the positive and negative leads on the battery are firmly hooked up. THere's also a ground connection between the neg terminal of the battery and the frame, and another one from the ground wire coming off the starter itself that hooks up on the battery box, positive side. Check for any corrosion between the lead and the frame, and make sure the bolts holding each ground to the frame are nice and tight.

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post #4 of 13 (permalink) Old 06-28-2009, 04:35 PM
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I had a similar problem where it seemed to have trouble turning over. I ran an extra ground directly from the negative terminal on the batt to where there is currently a ground connected to the engine (from the frame I believe) and it solved my problem.
-Mak
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post #5 of 13 (permalink) Old 06-28-2009, 05:56 PM
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I once had a battery charger that would indicate battery to be fully charged, when actually it was about 75 to 80%. After junking two battries I discovered the bad charger. It's rare but it happened to me.

57 years experience,Zero accidents. Starting with 1947 Indian Chief. Now VN750 , V65 Magna, Burgman scooter.
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post #6 of 13 (permalink) Old 06-29-2009, 12:10 AM Thread Starter
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I checked all the connections, and all seem good. cleaned all the connections and batt. terminals. Same problem. It seems to have trouble when its hot. I highly doubt it is the solenoid, because when I hooked it up to another battery, it cranks fine. also, I doubt it is a worn starter because the bike only has 7,500 miles on it. (and it cranks fine with another battery) I am leaning towards a defective charger. CLUES: the old battery that i took out, was so dead the lights barily lit up when the key was on, and the charger clicked off and said it was charged. It just seems like it doesnt have enough power to crank over. like a bad, or not charged battery.

1986 Vn750
18,800 miles, and counting
Bone Stock
New cam chain tentioners
all fluids changed
Spline Lube
windshield
Engine Guard
B-stone S11 RWL-stock sizes
*wanted*
New grips

2001 Vn750
13,100 miles, and counting
spline lube
Bridgestone S11 100/90
Shinko 170/80
rear end oil change
aftermarket mirrors
windshield
otherwise all stock
*anticipated mods*
Engine Guard
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post #7 of 13 (permalink) Old 06-29-2009, 12:54 AM
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What does a voltmeter reading give you?

Gordon

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Purchased May 16, 2008
Approx.19,300km (12,000 miles)

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post #8 of 13 (permalink) Old 06-29-2009, 06:00 AM
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You have an 86 VN750 with only 7500 miles on it? WOW!

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post #9 of 13 (permalink) Old 06-29-2009, 10:07 AM
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Put that battery on a different charger and try it. "Cheap things first" Also, will your bike battery crank your lawnmower??

57 years experience,Zero accidents. Starting with 1947 Indian Chief. Now VN750 , V65 Magna, Burgman scooter.

Last edited by waggy1236; 06-29-2009 at 10:14 AM.
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post #10 of 13 (permalink) Old 06-29-2009, 10:37 AM Thread Starter
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Quote:
Originally Posted by waggy1236 View Post
Put that battery on a different charger and try it. "Cheap things first" Also, will your bike battery crank your lawnmower??
I have not tried cranking my lawn mower with the bike battery, hahaha.

1986 Vn750
18,800 miles, and counting
Bone Stock
New cam chain tentioners
all fluids changed
Spline Lube
windshield
Engine Guard
B-stone S11 RWL-stock sizes
*wanted*
New grips

2001 Vn750
13,100 miles, and counting
spline lube
Bridgestone S11 100/90
Shinko 170/80
rear end oil change
aftermarket mirrors
windshield
otherwise all stock
*anticipated mods*
Engine Guard
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