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MSD Launch master 4350

gpxsrx

Expert
Joined
Dec 15, 2009
Messages
376
Location
Ontario
Country
Canada
Snowmobile
way to many 2 strokes
Having trouble hooking up does anyone know if the brake lever switch is ground activated or 12 volt activated switch ? Might have to change some wires around.
 

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Having trouble hooking up does anyone know if the brake lever switch is ground activated or 12 volt activated switch ? Might have to change some wires around.
It’s 12 volt activated. You have to switch the one pin on the 3 pin harness.
I hope yours works better than mine. Mine worked perfect the first day. Then it would only work intermittently and now not at all. Send it back to MSD and they said nothing is wrong with it. This is after I was on the phone with a MSD tech who said the box must be fried. I have no clue what is wrong with it.
 
The launch master seams to work a lot better when you use a relay to change your brake lever 12v to ground and use the ground activated wiring.I had same problem when I used 12v.
 
Had blue wire connected to the wrong wire in brake switch.
Still like to hook it up with a relay if it works better thanks guys
 
My blue wire is hooked up to the blue-yellow wire activating the brake lights. Not sure if the MSD box is super finicky on voltage causing it not to work. I might try to wire ground to a button to activate it.
For the relay, did you just splice out the blue-yellow wire and connect it to a 5 pin relay and and a ground source on your switch side of the relay? If that’s the case it may be easier.
 


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