Electrical issues with my 1989 750 Vulcan - 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 11 (permalink) Old 07-01-2016, 04:13 AM Thread Starter
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Question Electrical issues with my 1989 750 Vulcan

My 1989 kawasaki VN750 Vulcan is a bit sick... and hopefully someone here is capable of helping me with some tips..

The first issue i noticed was that the headlight was not working at times.. but when i stopped and started the bike a couple of times this suddenly started working.. but this happens about every time i start the bike.. (have to start / stop a couple of times before it works) when this happens , the brake light also stop working...

Then suddenly the "glow" in the turn signal lights only works in the front, not the rear ones (blinkers work, but not the "glowing")

then the battery was out of power.
the battery is pretty new, but the charging is not working properly..
i charged the battery, and have driven approx 1 mounth with it now without problems.. but when i measure the charging, it only is about 12,5-8 depending on rev.

i suspect some regulator rectifyer problems, but have a feeling it can be something else aswell.. anyone with some experience with this kind of trouble... plz comment.. all tips are welcome
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post #2 of 11 (permalink) Old 07-01-2016, 06:06 AM
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Quote:
Originally Posted by Andreas Otterdahl Moller View Post
My 1989 kawasaki VN750 Vulcan is a bit sick... and hopefully someone here is capable of helping me with some tips..

The first issue i noticed was that the headlight was not working at times.. but when i stopped and started the bike a couple of times this suddenly started working.. but this happens about every time i start the bike.. (have to start / stop a couple of times before it works) when this happens , the brake light also stop working...

Then suddenly the "glow" in the turn signal lights only works in the front, not the rear ones (blinkers work, but not the "glowing")

then the battery was out of power.
the battery is pretty new, but the charging is not working properly..
i charged the battery, and have driven approx 1 mounth with it now without problems.. but when i measure the charging, it only is about 12,5-8 depending on rev.

i suspect some regulator rectifyer problems, but have a feeling it can be something else aswell.. anyone with some experience with this kind of trouble... plz comment.. all tips are welcome
I had the same problem when I first got my '86 VN 750. In my case it was the ignition switch itself.

The switch was so worn that it would start and run fine, but I had to jiggle the key to just the right spot to get the lights to work.

I replaced the switch with a new one and that cured that particular problem.

The Rectifier/Regulator was also shot and had to be replaced.

This may not be the problem with yours, but it's a place to start.

I got the new switch from Babbitsonline, Kawasaki Parts House: OEM Parts Diagrams & Accessories

They carry OEM parts for the VN 750. Of course, it's at OEM prices too; though still cheaper than the local dealer.

1986 VN750
New front tire & rear tire
Brass fuel inlets
Spline Lubed
Swing arm cleaned and lubed
Final Drive oil
Cooling system flushed and filled
Earshaved
Coastered
Mosfet R/R and relocated
AGM Battery
Stock pipes
Stock seat
Trying to achieve Anodized Red Chrome paint... from a rattle can...
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post #3 of 11 (permalink) Old 07-01-2016, 12:34 PM
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It sounds like your regulator or stator has failed. Do a search on the forum here, there are tests for each of those components.

It is worth checking the ignition switch as well, but I would check your charging components first. The issue HarryS describes would not affect charging, so it's probably unrelated.

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
Tuxedo Mod
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

1989 Pontiac Firebird Formula 350
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post #4 of 11 (permalink) Old 07-01-2016, 08:10 PM
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the 'glow' you get in front is the front running lights.. also there are turn signals in the front.

the rear does NOT have running lights, only turns signals, so lack of 'glow' there is normal

the 'glow' should be pretty bright, but not as bright as when turn signals are lit
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post #5 of 11 (permalink) Old 07-01-2016, 11:14 PM
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Quote:
Originally Posted by michiganteddybear View Post
the 'glow' you get in front is the front running lights.. also there are turn signals in the front.

the rear does NOT have running lights, only turns signals, so lack of 'glow' there is normal

the 'glow' should be pretty bright, but not as bright as when turn signals are lit
Correct, the lights on mine were strictly a problem with the ignition. Which of course would not affect charging.

However, the burned out R/R did. (SO glad that it wasn't the stator)

The posts on here were invaluable in tracking down the charging problems.

The experience shared on here is an invaluable resource.

1986 VN750
New front tire & rear tire
Brass fuel inlets
Spline Lubed
Swing arm cleaned and lubed
Final Drive oil
Cooling system flushed and filled
Earshaved
Coastered
Mosfet R/R and relocated
AGM Battery
Stock pipes
Stock seat
Trying to achieve Anodized Red Chrome paint... from a rattle can...
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post #6 of 11 (permalink) Old 07-01-2016, 11:19 PM
HarryTX
 
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Quote:
Originally Posted by HarryS View Post
I had the same problem when I first got my '86 VN 750. In my case it was the ignition switch itself.

The switch was so worn that it would start and run fine, but I had to jiggle the key to just the right spot to get the lights to work.

I replaced the switch with a new one and that cured that particular problem.

The Rectifier/Regulator was also shot and had to be replaced.

This may not be the problem with yours, but it's a place to start.

I got the new switch from Babbitsonline, Kawasaki Parts House: OEM Parts Diagrams & Accessories

They carry OEM parts for the VN 750. Of course, it's at OEM prices too; though still cheaper than the local dealer.
My apologies for my confusing post; To clarify; when I first got my VN, it had a problem with the lights not working AND a separate problem with it not charging.

Thus the reference to the R/R. I'll try to be more coherent in the future.

1986 VN750
New front tire & rear tire
Brass fuel inlets
Spline Lubed
Swing arm cleaned and lubed
Final Drive oil
Cooling system flushed and filled
Earshaved
Coastered
Mosfet R/R and relocated
AGM Battery
Stock pipes
Stock seat
Trying to achieve Anodized Red Chrome paint... from a rattle can...
HarryS is offline  
post #7 of 11 (permalink) Old 07-03-2016, 06:55 AM Thread Starter
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thank you for some good tips. i have ordered a new R/R , and hopefully this resolves the charging issues... the stator is a pain to change on these bikes i have been told :S

i will also check the ignition, since it is a issue with the lights and also the lighting on the ignition cover is not working properly.
its kinda weird tho, that on a bike that dont charge, i can still drive alot of times without the battery getting any lower.. it still says 12,5V (ish) after several trips after recharging it..

maybe it just charges low effect.. when i rev the engine the charging goes up 12,8-9V from approx 12,3-5V.. something is creating a little electrisity.. so i pray that the regulator is the one to blame here :S

but... does the regulator also effect the headlight? since it sometimes dont light up..
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post #8 of 11 (permalink) Old 07-03-2016, 03:10 PM
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Have you tested anything yet?read this thread
https://www.vn750.com/forum/showthread.php?t=24093

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post #9 of 11 (permalink) Old 07-03-2016, 03:31 PM
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Quote:
Originally Posted by Andreas Otterdahl Moller View Post
thank you for some good tips. i have ordered a new R/R
Did you test any of the components, or are you blindly ordering in the hopes of a magical fix?

Test components before you buy anything; it's a rule.

You said your headlight doesn't light up; it's probably your stator. It isn't that hard to swap the stator to be honest, just takes some time.

But before you do anything, TEST THE COMPONENTS!
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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
Tuxedo Mod
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

1989 Pontiac Firebird Formula 350
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post #10 of 11 (permalink) Old 07-07-2016, 01:44 PM Thread Starter
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Thanks again. Yes i have tested the r/r after a search no how to. And IT was OK. Ill check the stator when i come home from vacation 😊
Thanks for sharing the testing "for dummies" link, because i am .. 😳
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