Low voltage while running. - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
Electrical
Where does this wire go?
Includes Electrical mods, Lights, Stator,
Rectifier, Diagrams, etc

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post #1 of 25 (permalink) Old 06-21-2012, 03:53 PM Thread Starter
Madmaverick83
 
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Low voltage while running.

I am new so please dont yell to much because i am sure this is somewhere in here just didnt see it, yet. Any how i have been having a problem with my bike shutting off while idling when i hit the breaks. Looked around heard that its prone to weak electrical and to replace lights with leds. So i replaced my break lights with led replacements and replaced head light with HID both because they draw less power. once i have done this it runs fine now no problem. I have however noticed that the battery seems week, it had a warranty so i swapped it out. better but still seems to not crank over as fast as it should unless i keep it on a battery tender. So i finally checked the voltage at the pig tails for the battery tender while running. about 12.6v before start, 11.95v after start, reved to 3000 rpms got 12.11v, took it for a hour and a half ride came back. as i was letting it run and getting my multi meter again the cooling fan came on a killed the engine. started it back up with a little problem but not too bad. Checked it while running this time it was at 11.4 v reved again to get 11.5v. now my multi meter may not be the most accurate thing in the world but i know its close enough. So WTF is going on? is it a voltage regulator or the (and i sure hope its not) stator? or something else?
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post #2 of 25 (permalink) Old 06-21-2012, 04:04 PM
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#1: Check all connections. A faulty ground can cause havoc.

#2: Slim posted a guide on how to test the R/R and stator separately with your meter. Run through those tests and they should identify the culprit. Could be stator, but without the tests you can't rule out the R/R.

1986 Kawasaki Vulcan 750
NGK Iridium Plugs #7803/DPR7EIX-9
Duralast Gold ETX15 AGM Battery
Coastered & Shaved
TOC MCCTs
Metzeler ME880 [110/90-19, 170/80-15]
Balance Dampers Replaced
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Rebuilt Forks w/ Progressive Springs
V&H Cruzers
VN750.com Grill Cover
Meanstreak Seat
Emgo 23-92411 Handlebars
MOSFET FH012AA R/R


1990 Kawasaki Vulcan 750

1998 Honda VFR800 FI

2014 Honda VFR800F

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post #3 of 25 (permalink) Old 06-21-2012, 04:37 PM Thread Starter
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where would i find his guide at?
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post #4 of 25 (permalink) Old 06-21-2012, 05:43 PM
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Quote:
Originally Posted by madmaverick83 View Post
where would i find his guide at?
I can't find Slim's guide but read this thread.
https://www.vn750.com/forum/showthrea...ht=stator+test

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post #5 of 25 (permalink) Old 06-21-2012, 05:48 PM
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my Flow Chart .. just fallow the link in the thread... do EVERY single test that I have listed.. weather you feel its pertinent or not.. then post those numbers back in this thread. From there we can pinpoint exactly what is going on.
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post #6 of 25 (permalink) Old 06-21-2012, 05:48 PM
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Here ya go, (edit) looks like Slim beat me to it

https://www.vn750.com/forum/showthread.php?t=21206
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post #7 of 25 (permalink) Old 06-21-2012, 08:05 PM Thread Starter
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ok, i will get started on it but have too cook dinner too. will see how much i can get done today.
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post #8 of 25 (permalink) Old 06-21-2012, 08:26 PM
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Check your big batt cables first. Espacially the ground.

02 honda sabre 1100
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post #9 of 25 (permalink) Old 06-21-2012, 08:28 PM Thread Starter
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well this is interesting. so i took my seat off and the side cover and find that one of my stator wires was not connected. No idea how but it wasnt, any way i fired it up to get some readings for you to see what you think. 12.65v prior to start, 12.05 at cold idle with head light off (previous owner put it on a switch), 12.45v at 2500 rpms, 11.85v at idle with headlight on but at 2500rpms went to 12.4 and looked to be increasing. didnt take readings for long because i didnt want to warm the engine up because flow chart said to have engine cold. whats your take on it. it took only a minute or two of run time while performing these checks

Last edited by madmaverick83; 06-21-2012 at 08:49 PM.
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post #10 of 25 (permalink) Old 06-21-2012, 08:49 PM
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Rev up to 4K and see if you get up to high 13v or low 14v.

02 honda sabre 1100
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