Dead short somewhere - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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Where does this wire go?
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post #1 of 16 (permalink) Old 01-22-2010, 09:15 PM Thread Starter
 
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Dead short somewhere

The bike has not been used since before Christmas and it ran fine all last year. I came to start it and there's a dead short somewhere. When a put a meter across the battery it shows 13 volts. Turn on the ignition and the voltage drops to almost zero. Attached to the Battery live cable at the starter relay as a feed wire in white and red. If I disconnect this, the short disappears. My question is....where does the white and red feed wire go to and why would it short for no apparent reason?
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John UK
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post #2 of 16 (permalink) Old 01-22-2010, 09:21 PM
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Quote:
Originally Posted by johnnybaby View Post
The bike has not been used since before Christmas and it ran fine all last year. I came to start it and there's a dead short somewhere. When a put a meter across the battery it shows 13 volts. Turn on the ignition and the voltage drops to almost zero. Attached to the Battery live cable at the starter relay as a feed wire in white and red. If I disconnect this, the short disappears. My question is....where does the white and red feed wire go to and why would it short for no apparent reason?
Thanks
John UK
That wire goes to the junction box and then to the regulator/rectifier. That wire feeds the junction box and when the bike is running it charges the battery. Check the back side of the junction box and R/R connector for acid damage from the battery.


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post #3 of 16 (permalink) Old 01-22-2010, 09:27 PM Thread Starter
 
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Thanks for quick reply. I'll try it in the morning.
John
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post #4 of 16 (permalink) Old 01-23-2010, 07:14 PM Thread Starter
 
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Dead short found

I think I've found the dead short. The fuse box has a short through the main fuse. Remove the fuse, no short. I'm going to bypass the fuse and fit an inline one.
John UK
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post #5 of 16 (permalink) Old 01-24-2010, 12:01 AM
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I thik your short is beofre the fuse... which means it is external from the JB

but if you suspect the JB... I can repair it. send me a pm for more info...
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post #6 of 16 (permalink) Old 01-24-2010, 04:27 AM
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If removing the main fuse eliminates the short, I suspect that you actually have a bad battery, because a healthy battery has no problem blowing the fuse.

With a good battery you get heavy sparking when you connect/disconnect it, if something is shorted.
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post #7 of 16 (permalink) Old 01-24-2010, 11:23 AM
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I would agree with the battery. I thought I had a dead short, battery would be fine, start the bike and dead! What it turned out to be was the battery. Eventually it would not even take a charge and here's why. The battery was fine when cold, but once it started warming up there was a seperation in the plates/elements. Battery eventested fine for initial load, but the mechanic went on to explain that AGM batteries do not like to be drained down to zero will develop a bad spot, so your dead short is actually IN the battery.
Never heard of it before but decided to replace the battery anyway (Start with the simple stuff first). New battery, new life and no more dead short!

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post #8 of 16 (permalink) Old 01-24-2010, 01:58 PM
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Quote:
Originally Posted by Dianna View Post
I would agree with the battery. I thought I had a dead short, battery would be fine, start the bike and dead! What it turned out to be was the battery. Eventually it would not even take a charge and here's why. The battery was fine when cold, but once it started warming up there was a seperation in the plates/elements. Battery eventested fine for initial load, but the mechanic went on to explain that AGM batteries do not like to be drained down to zero will develop a bad spot, so your dead short is actually IN the battery.
Never heard of it before but decided to replace the battery anyway (Start with the simple stuff first). New battery, new life and no more dead short!
Actually this is quite common in colder climates, with conventional batteries... I used to see it a lot when i worked for NAPA. I still see it occasionaly on the military batteries as well.
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post #9 of 16 (permalink) Old 01-24-2010, 05:31 PM Thread Starter
 
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Dead short

Thanks for all the replies. I'll try the battery route. Must admit I wasn't thinking in that direction, I always seem to suspect the complicated things!
I'll let you know how I get on.
John
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post #10 of 16 (permalink) Old 01-25-2010, 01:58 AM
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I agree it almost has to be the battery. First of all, a dead short would immediately burn out the fuse, and if someone were dumb enough to replace the fuse with something solid, or bypass the fuse, it would burn up most of the wiring on the bike. I learned about the importance of fuses the hard way a long time ago, when as a teenager, I fried almost all the wiring on a '63 Chevy II after causing a short with no fuse. It took me weeks to rewire everything. Jerry.

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