3rd Wont Fire

mercslive

Cadet
Joined
Aug 12, 2007
Messages
11
My Mercury 75 Hp 4 Cly. Wont Fire On Number 3 The Owners Be For Me Put A New Switch Box Already Can Anyboby Help Me Please! Sn#a190680
 

Laddies

Banned
Joined
Sep 10, 2004
Messages
12,218
Re: 3rd Wont Fire

If a engine is not running on only 1 cyl, it has to be the switchbox, coil or related wiring to that cyl. simply cross the switchbox output wires with the cyl, next to it and crank the engine if the spark follows the wire then it's the box, if it's the same it's a wire or coil
 
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