Gremlins - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
Where does this wire go?
Includes Electrical mods, Lights, Stator,
Rectifier, Diagrams, etc

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post #1 of 14 (permalink) Old 02-08-2012, 03:44 PM Thread Starter
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Red face Gremlins

There's gotta be gremlins in there! It's one of those days where I just want to part the thing out and be done with it. But my desire to ride keeps me pushing on.

Anyway, I put the key in the On position, put her in heutral, grab the clutch, press start and... I hear a single click of the starter relay and then nothing. All the lights go out and the voltage at the battery droms from 12.6 to 2 volts. It stays that way for about 10 seconds and then like magic, it jumps up to 12.6 again as if nothing ever happened. All the lights come back on and if I want to torture myself again I can press start and repeat the process.

A lil history can be found in this thread ( but I'll summarize it here:

The stator is bad. I've been using a charger to maintain the battery but for the past couple of weeks both the charger and R/R have been disconnected and the bike hasn't ran.

The R/R was replaced a month ago with a MOSFET but aside from running the bike once in the driveway it has not been used.

The junction box was replaced a day or two before the R/R was replaced.

The battery is a MF Yuasa but it's few years old and probably been through hell while I troubleshooted the charging system.
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post #2 of 14 (permalink) Old 02-08-2012, 04:21 PM
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Did all these type problems start after you did all this maintenance?

You replaced your junction box with one from a ninja 600? Are you sure there compatable? Im also curious how you did the wiring for your Mosfet R/R.

The bike should start and run fine with the R/R disconnected as long as the battery is good, but as soon as the battery gets low enough not to support the ignition, it will stall. The stator and R/R is just for keeping the battery charged. so if your having this problem with it disconnected, you know thats not where the problem is.
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post #3 of 14 (permalink) Old 02-08-2012, 04:35 PM Thread Starter
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The junction box from the ninja is the same part in our bikes. I did swap it out with the original to rule it out and had the same issue. The ninja box worked fine when I originally put it in.

As you said, with a charged battery and the R/R disconnected, the bike should run assuming the battery's handling the load (which I suspect it is not). I don't want to run out and buy another battery without some second opinions though.
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post #4 of 14 (permalink) Old 02-12-2012, 01:11 PM Thread Starter
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Have I stumped everyone here? Should I go buy a new MF battery?
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post #5 of 14 (permalink) Old 02-12-2012, 01:36 PM
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Double check connections for corrosion/tightness. Another left field possibility could be the stater brushes, not hard to check but it calls for pulling the starter which calls for draining the oil. A quick check is using jumper cables connected to a car battery (non-started vehicle) If these check out then the culprit is the battery, but I'm more inclined to think connections.

87 vn750at least that is what the frame #'s say
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post #6 of 14 (permalink) Old 02-12-2012, 02:13 PM
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That also happens when you have a short sometimes.

1985 VN700 unknown mileage (over 33K)

AGM Battery
Iridium spark plugs
NGK wires and caps
Relocated R/R
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post #7 of 14 (permalink) Old 02-12-2012, 02:31 PM
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Sounds like a loose or bad ground, try running a new thick wire for a grount to eliminate a posibility.
Had the same issue on a car a couple of months ago.

Chad Falstad "Hawk"
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post #8 of 14 (permalink) Old 02-13-2012, 04:06 PM
Crap, I WAS in 5th gear.
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Sounds like an internal short in the battery. Charge it up and have it tested.
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post #9 of 14 (permalink) Old 02-13-2012, 04:54 PM
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Have to ask. Do you have a Gremlin Bell on the bike?

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post #10 of 14 (permalink) Old 02-15-2012, 05:43 PM Thread Starter
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Thanks for the suggestions. Seems like the ground wire is ok. I had to leave the key in the On position for a few minutes this time before I got any voltage to show at the battery. Then like before the moment I pressed start it dropped to .5 volts. I waited about two minutes for it to come back up again before cleaning up my tools and calling it a night.

I do in fact have a bell. However, it is one I bought so as you know, it's power is reduced. That bell is a replacement for one that was given to me though. The original was bitten off by a road gator that I hit at 90mph in the Nevada desert. Sometimes I wonder if it would have taken my foot had the bell not been there
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