2003 Traxter Max MPEM Fuse Keeps Blowing - Page 3 - ATVConnection.com ATV Enthusiast Community

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Old 12-22-2015, 11:52 AM
Weekend Warrior
Join Date: Dec 2015
Posts: 5
Default MPEM repair

We purchased a 2003 -2003 Traxter Max with a blown MPEM. The prior owner said it worked fine until the battery went dead and they jumped it. It never rain again. A new MPEM was $1300. After doing research I found where the power supply components on the MPEM were located. I dissected the components out of the rubber potting with a scalpel and replaced the shorted diodes (There were two).

The Unit worked again. We then re-potted the MPEm with silicone gasket maker and are back in business.

If anyone has a dead MPEM caused by jumping the battery, can probably fix it for less than $200. Merry Christmas

770 251 4080.
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Old 05-16-2016, 07:04 PM
Weekend Warrior
Join Date: May 2016
Posts: 1
Default jag1963

Hello all,im working on a 500 bombardier traxter and having a hell of a time to figure it out,the timming is completly screwed up cus it backfires through the carb and wont try to start.it belongs to a buddy of mine,and i have the unfortunate job to try to fix it.the more i read up on this i think maybe it could be the mpem.it had been running fairly bad up until a few weeks ago but now it wont start at all,all kind of spark but i think the timming is off,as it just backfires through the carb steady,would much appreciate all the help i can get.
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Old 11-02-2016, 11:20 PM
Weekend Warrior
Join Date: Nov 2016
Posts: 1
Default Mpem repair

Are you able to repair these? 20 amp fuse blows when turning on the key.

Originally Posted by edgecase View Post
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.
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Old 01-12-2017, 02:33 PM
Weekend Warrior
Join Date: Jan 2017
Posts: 2

anyone have a pdf repair manual for a Traxter?
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