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Author Topic: MXU 250 electrical problem  (Read 7254 times)

dave9252

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MXU 250 electrical problem
« on: November 10, 2009, 10:17:27 PM »
I'm trying to find out a rememdy/cause to my "Main" (15A) fuse blowing, i had it running fine and it blew on me while out riding, i changed it for the spare which blew straight away, i used a piece of wire as a 'get me home' fix, which worked for about 20kms. i left it for a few days before trying a 15A again, it worked on 'tick-over' for 10-15 mins but blew after about 5 mins of driving. An old fault with the orignal start switch and gear inhibitor is still present so assume its not linked.
Your help and advice will be greatly appreciatted.
Dave
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zombie

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Re: MXU 250 electrical problem
« Reply #1 on: November 11, 2009, 01:08:35 AM »
The EASIEST way to find a SHORT is to unplug all the circuits from the fused link. Replace the fuse, and begin plugging parts back in until you blow the fuse again. Once you find the bad system it should be fairly easy to ID. the faulty part/ harness. It will help to remove as much of the plastics as you can to track down all the connectors. As far as I can remember from BASIC electronics, every 1 amp you increase the wattage to a circuit by 10. So the amount of "heat generated" in any given circuit is going beyond what is safe when you "upgrade"the fuse. I have had too many spoiled rides from a simple bad fuse, so I replace the fuse w/ a circuit breaker. I realize you have a problem causing the fuse to blow , but you may want to consider a circuit breaker when you do correct the problem.
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dave9252

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Re: MXU 250 electrical problem
« Reply #2 on: November 11, 2009, 07:43:05 PM »
Many thanks for the advice, i don't suppose you know where i can get a wiring diagram from so i can start the fault finding. I'm in Germany at the moment in the military so trying to find 1 local is difficult (they write in a funny language  lol).
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zombie

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Re: MXU 250 electrical problem
« Reply #3 on: November 11, 2009, 07:58:58 PM »
I didn't look myself, but this site USUALLY has all the manuals you will ever need. If you can't find it here, try using Surf Canyon as your search engine. It will put a bullseye on all the results. You click on the most pertinent bullseye, and it will continue to narrow your search through 100's of pages. Really saves alot of time. Best of luck! let us all know how it works out! Just as an after thought. stadiumyamaha.com has an exploded view of the harness on the parts search pages. That may be enough to get you going.
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"They have nothing in their whole imperial arsenal that can break the spirit of one Irishman who doesn't want to be broken."   Bobby Sands...

kennyatshop

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Re: MXU 250 electrical problem
« Reply #4 on: November 26, 2009, 05:48:59 PM »
hey dave email me for a wireing diagram for your bike, thanks


blacklotus_400@hotmail.com
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kennyatshop

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Re: MXU 250 electrical problem
« Reply #5 on: November 26, 2009, 05:53:30 PM »
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dave9252

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Re: MXU 250 electrical problem
« Reply #6 on: March 28, 2010, 07:08:59 PM »
Many thanks, sorry for the delay in replying.
It seems the problem was with my ignition cables, i renewed my battery after it was sat for 4 months and as soon as i turned the ign on it blew the fuse, i removed it and seperated the cables and it seems to have solved the problem.
But it seems my electrical whoes are not over, the inhibitor has stopped working so i have had to disconnect it from under the seat, it has also stopped the start switch from working. (i did try and jump start it from my truck thou).
Any help on this will be greatly appreciatted, now i remember why i hate electrics.
Dave
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