I'm having a problem with the MPEM (Multi-Purpose Electronic Module) Fuse Blowing.  I recently replaced the battery and replaced the plugs.  It started fine and then the next weekend it started blowing the 20 amp fuse.  When I turn the key to the ON position the fuse will blow and no indicator lights flash on the dashboard.  Any ideas or tips would be greatly appreciated.  Just put on new tires and haven't been able to test them out.

Thanks  

You definitily have a short. Check any and every wire along the frame, make sure they arent rubbing metal to metal  

(I posted the same reply in atvconnection.com... just repeating here in case someone else has the same problem)

I am in the process of repairing a Bombardier MPEM for a 2002 Traxter for a local bike shop. I do various kinds of electrical and electronic repairs for this customer, and they contacted me when the repair shop reached a dead-end on the electrical problem, and the cost of a new MPEM was prohibitive.

If you still have the old MPEM, and you can confirm the same symptoms, I may be able to repair the module economically. Send me a private message if you are interested.

The blowing fuse problem is caused by a shorted diode. The customer was "boosting" the Traxter due do a bad battery. It started and ran a short time with the lights flickering (due to the short). The next attempt to start it failed. If the fuse is replaced with the standard size, it blows when the ignition switch (key) is turned on. If the fuse is replaced with a 30 amp (careful here... this was done with an external battery and jumper cables, which likely limit the possibility of dammage due to over current) there is a faint ticking sound. This is the result of an oscillation caused by the key turning on a transistor, switching on power to the circuit with the shorted diode. The short caused the voltage to drop, switching off the transistor, removing the short, which causes the voltage to rise again, and the cycle repeats.

If you have a Traxter, I suggest you don't *ever* try to start it from another vehicle with the engine running. I believe the shorted diode is a result of "boosting", where the running vehicle's alternator overshoots the voltage at the instant you stop cranking the Traxter, frying the MPEM. Jump starting from a nother battery, possibly in a vehicle, should be OK though.