Battery not charging after bike warms up - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 20 (permalink) Old 11-09-2011, 09:09 PM Thread Starter
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Battery not charging after bike warms up

Hey guys I'm back. A little sooner than I had hoped unfortunately.

So I recently installed A TPE stator from Tim Parrot, a mosfet r/r, and a mf agm battery. I checked the grounds and they seemed fine to me.

When the bike is cold it starts fine and runs fine. It puts out a little less than 14v at idle and goes up to 14.5 as I increase the rpms. After about 5-10 mins the voltage goes down to about 12.6v at idle and a little over 13v as I rev it.
It won't stall if I keep the revs up, but as soon as the rpms are down to idle it stalls out and the oil light goes on.

Does anyone know what the problem could be?

Thanks in advance for your help
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post #2 of 20 (permalink) Old 11-09-2011, 09:34 PM
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After about 5-10 mins the voltage goes down to about 12.6v at idle and a little over 13v as I rev it.
It won't stall if I keep the revs up, but as soon as the rpms are down to idle it stalls out and the oil light goes on.

Low on Oil.... Stator over heating.

maybe ? ? ?

WilliamTech

'86 VN750 13,700 mi -Stock
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post #3 of 20 (permalink) Old 11-09-2011, 09:46 PM Thread Starter
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The stator still puts out about 70v - 90v from the yellow wires when the engine is hot.
I thought that the oil light just goes on when the engine stalls out.

I'll check the oil level tomorrow


The oil light only lights up when the engine is about to stall and goes away if i roll on the throttle. But stays on if it has stalled
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post #4 of 20 (permalink) Old 11-09-2011, 10:58 PM
Crap, I WAS in 5th gear.
 
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Oil light goes on when there is low oil pressure and the ignition switch is on. Low or no rpms equal low or no oil pressure. Your oil light is working fine. Sounds like maybe an r/r problem, is your old one functional?
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post #5 of 20 (permalink) Old 11-10-2011, 01:39 AM Thread Starter
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The old r/r was faulty and this mosfet is brand new, just got it.
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post #6 of 20 (permalink) Old 11-10-2011, 04:33 PM Thread Starter
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Just checked all grounds again and cleaned them just in case. also cleaned the connectors between the stator and the r/r.
checked the voltage again.
with the engine cold at idle i get around 14v and at 5k i get 14.5
when the engine warms up and the fan kicks in it's about 13v at idle and 13.3 at 5k, and when the fan goes off the voltage is back to normal.
later the voltage drops to <13v at idle and 13.3 at 5k even with the fan off.

the stator puts out 25-110 ac voltage when it's cold and when it's hot.

also something i noticed is that when the voltage goes down the engine wants to stall, but if i unplug the stator from the r/r the rpms go back up to normal idle.

and when the r/r is disconnected from the battery it is putting out 15.5v at idle and 15.3 at 5k


btw the oil is not low, but i do have a tiny leak.



any ideas?

Last edited by Olezhka; 11-10-2011 at 05:21 PM.
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post #7 of 20 (permalink) Old 11-10-2011, 04:50 PM Thread Starter
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r/r is relocated and it's a mosfet so it shouldn't be overheating anyway

does it still sound like the r/r?
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post #8 of 20 (permalink) Old 11-13-2011, 01:54 PM Thread Starter
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Anyone?
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post #9 of 20 (permalink) Old 11-13-2011, 03:00 PM
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Your voltage at idle seems really high. SHould be around 12.8 at 1100 rpms, jumping to 13.5 - 15.0 above 2500 rpms. The fact that its output is decreasing as the engine warms up sounds like that may be your culprit.

C
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post #10 of 20 (permalink) Old 11-13-2011, 09:48 PM
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What are the cold and warm idle rpm's. Warm idle should be 1100 rpms. Alot of people want it to sound like a Harley so they lower the rpm's way to low.
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