Thread: mercury switch box

Here is a test for you. Swap the stator leads end to end on the switch box (Red with red/white and blue with blue/white). If the problem moves to the other cylinders, the stator is bad. It the problem stays on the same cylinders, the switch box is likely bad.

If it is the switchbox you really should replace both of them for a couple reasons. Because of the bias between the 2 the bad one can make the good one look bad. Also if those are the original switchboxes, a replacement is going to be at a much higher revision level than the old one. Having one old one and one new one could cause the motor to run poorly and damage the new box.

thanks Bill, just swaped the stator leads between the switchboxes and the problem stuck with the same cylinders...looks like i'm buying a pair of switchboxes. Does anyone recommend a good place to buy them....preferably cheap?

i gotta get this thing up and going....the water's warming up fast!!!

Do a search on CDI marine parts. They are cheaper than Merc and made much better.

will do, thankyou. Should i also swap the trigger leads and perform the same test to rule out the trigger?

I found good prices at seilermarine.com. Found it through google. All good info, just went through this last year myself. Changed one and the boat ran, changed the other and it runs like a scalded dog now.