Now there's your problem - 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 7 (permalink) Old 07-31-2008, 05:02 PM Thread Starter
 
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Now there's your problem

I have been trying to track down some issues on a 90 VN750 that I recently purchased. Yesterday I was riding slow and the temp gauge was nearing the redline. Running at highway speeds brought the temp down, so I suspected the radiator fan. When I grounded the temp switch connector the fan would not turn on. More tracing of wires until I finally decided to bite the bullet and remove the junction box and peek inside.

The corrosion looks to be a combination of battery acid and heat generated by increased resistance.

If you are scratching your head at electrical problems, drilling out the plastic on the back side of the Junction Box is not that difficult (just use a 3/16 bit and drill down ~1/8") Then go around the edge with a flat screwdriver and pry the case apart. It seems pretty easy to put back together if your circuit board is still good.

I got a new box on order, but came away with 2 good lessons. MF batteries are good and don't be afraid to open stuff up.
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post #2 of 7 (permalink) Old 07-31-2008, 05:07 PM
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Same thing happened to mine, but I think that the corrosion comes from the box being wet from rain or wash water.

Welcome to the forum. Glad that you found your prob rather quick.

02 honda sabre 1100
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post #3 of 7 (permalink) Old 07-31-2008, 05:41 PM
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Is there a source for the relays used in the JB? My fan has the same problem. Fortunately, most of my riding is at 50+ so I don't have to worry about it but it would be nice to have if/when I get to ride in the city.

Jim W
93 VN 750 "Ursula"
Moved R/R 08Sep06
R/R rewire 17Feb07
New R/R, Installed 14Jun08
New Stator installed 10 Jun08
Maintenance Free Battery 12Jan08
21480 Miles
VROC #8542
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post #4 of 7 (permalink) Old 07-31-2008, 07:10 PM
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Quote:
Originally Posted by Sky Rider View Post
Is there a source for the relays used in the JB? My fan has the same problem. Fortunately, most of my riding is at 50+ so I don't have to worry about it but it would be nice to have if/when I get to ride in the city.
If all the relays in the box are the same, maybe some one has old JB that they can part with. Now if you are a good electric tech, you can replace it with one from another box.

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post #5 of 7 (permalink) Old 07-31-2008, 08:13 PM
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mine didnt work so i took it out and put it to direct power and it still didnt work so i guess mine was effed up. + i dont have to worry about the jb bc i dont have 1 lol

1990 Kawasaki Vulcan 750

.... slightly modified
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post #6 of 7 (permalink) Old 07-31-2008, 09:46 PM
 
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Hi Clocker

I would also take some time to check the cooling system out to make sure you don't have issues with the coolent level, thermostat openning, blocked radiator etc.

If the coolent has not been changed recently, give it a change.
Reverse flush the radiator.
Remove and check the thermostat.
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post #7 of 7 (permalink) Old 08-01-2008, 04:09 AM
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There are a few people around here who have soldered in a new relay successfully...
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