Nytro blowing ignition fuse and Main 40 amp fuse

[T-Nytro]

I seems to happen when running the sled for about 5-10 minutes. After running it hard back and forth in the feild it will pop the fuse either one or the other. I ran the sled out of gas once last year and that is when it started blowing the ignition fuse. Now it will either blow the ignition fuse or the main fuse. What do you think. I replaced the fuel filter and still pops fuse. I am thinking it is the MCXpress external fuel pump but looking for suggestion. All connection dielectric greased and no moisture anywhere. Not enough snow for moisture.
After replaceing the blow fuses it runs perfect, until I run it hard back and forth in the feild.

I looked for any wires chaffing on underneath the handle bars, seems good. and cant see anything chaffing on the clutch side where the wires run along the inside of the bulkhead.

 

[usafracer]

Make sure your battery terminals are tight and clean at the battery. I ran into the the same problem on a sled last year.

 

[stopdropanroll]

Yeah, clean contact on battery, then you could try to up the fuse by 5amp, it might just be on the verge of blowing and another 5amp shouldn't hurt the sled any, the main power cable will support that amperage for sure.

 

[T-Nytro]

Cleaned the battery contacts and the Main chassis ground. Still blew fuses. I have already upped the ignition fuse from 20A to 30A due to the external fuel pump.

I managed to find a new fuel pump, so I am going to change it a see what happens. Seems like the likely culprit. The old pump did seem to whine also.

 

[T-Nytro]

Just an update. Took it to Slave Lake Yamaha, and they found the problem, the main harness that runs down the left side infront of the motor was rubbing a nub on the motor. It wore through around 6 wires and burn the harness. It was shorting on the motor. Problem solved.

thanks for the suggestions.