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So I was doing some wiring of something under the seat, and I start seeing sparks and smoke coming from the side of the battery tray. The positive battery cable was shorting on the frame, because it was wedged between the frame and the battery tray and the insulation had been worn off. This might be a good thing to check on your MVs because your positive cable may be routed the same way mine was. Luckily for me, I found it before it got any worse and was able to repair the cable and re-route it to avoid any problems in the future. I'll post some pics later.
 

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Mmm..what wiring were you up too? positive terminal against sub frame should not cause a short, as lonf as your negative connection was on and good...thanks for the heads up!
 

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I'm guessing it cut through the insulation. Take a photo as was?

Graham - remember these are negative earth bikes, so +ve terminal to earth/ground (subframe also at earth/ground/-ve potential) = short
Lucky you didn't :flamethroBrutale
 

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Steptoe said:
I'm guessing it cut through the insulation. Take a photo as was?

Graham - remember these are negative earth bikes, so +ve terminal to earth/ground (subframe also at earth/ground/-ve potential) = short
Lucky you didn't :flamethroBrutale

Ha! so the sticker 'remove -ve connection first before working on electrics' now makes sense!! :blush:
 

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Hey getcrakin,

If you are standing on the left side of the bike looking down at the battery, how was your positive cable routed? Was the cable rubbing on the cross bracket where the back of the seat locks on to?

Thanks

Rags
 

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Discussion Starter #8
Here's a pic of how the cable was routed. It was rubbing in the seat lock release bracket where the release cable is mounted into the frame. The green arrow is pointing to the area where it was wedged between the battery tray and the frame.

 

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I bought a new MV F41000R last year. It had the +ve battery cable jammed against frame up too. It would have caused a direct short if it had been left like that. I would imagine this was a dealer inflicted issue if they fit the battery and not the factory ?. As soon as I lifted the seat the problem was staring me in the face. I had only done the journey home 50 miles from the dealer so no harm was done.

A great deal of harm was done however by the Datatool alarm wiring melting imho because of routing the loom between the cyl head and fairing heat shield ( it does get hot in there doesn't it ! ?? ) . So New wiring harness...new ecu ,TPS, side stand cut out switch...oh and a new datatool alarm system
This involved my brand new bike being at the dealers for over 6 months with me test riding it between issues..
The last straw was whe the datatool black box..melted onto the rear heat shield..poking a nice hole in it.

I traded in the bike for a 1000R 312..and guess what ..I stipulated no alarm....NO Alarm = no problems..

I had paid a lot of insurance to have my bike sat in a dealership....

As The Merecat says..." Simples "
 

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Mmm..what wiring were you up too? positive terminal against sub frame should not cause a short, as lonf as your negative connection was on and good...thanks for the heads up!

Um, I beg to differ...if the positive cable/termial/or portion of the circuit touches ground (the cassis/subframe/negative terminal) you will close a "circuit" and create current flow...it is how the electrical system works. Shorting the positive cable directly to the subframe in the manner described will create an excessive amount of current, and, if allowed to continue, will result in a fire or battery explosion...it is good you happenend to be present and not riding!
 
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