Dam it not again

[phatdaddy]

Only way i know is to swap it and if problem goes to other 3 plugs, its a bad box..

Also if you replace one, might as well do both

[steplift20]

Yes phat but does the stator fire three plugs on one side what I mean if I'm losing three plugs on one side I know it could be a switch box but can a stator do the same thing?

[phatdaddy]

I am not a mechanic, but the way i understand it, if your motor is charging, your stator is working.

The switch boxes are like a distributor on a car, sends the fire to the right plug at the right time.

Have u determined that it is only hitting on 3 cylinders?

[steplift20]

Thanks phat, one more question, I have seen switch boxes on Amazon,2 for 59,00 but they have a ground wire and I think mine are grounded to the block when you install them so I am Leary about getting them cause they have a ground wire and the Mercury ones do not have a ground wire ,it's grounded to the block when installed, what do you think?
The ones on Amazon are from CDI.

[phatdaddy]

That s more of a Spare or Ferm question. I would not buy used ones, no matter how cheap.

As far as the grounds, I think mine grounded through the mounting bolts

[steplift20]

Phatdaddy, they are brand new 2 for 59,00 from Amazon , they are not quick silver they are from CDI an off market brand but the only thing that I see is that they have a ground wire and the quick silver ,Mercury brand does not have a ground wire . The boxes ground by screwing them into the block. They say they are a replacement and the price is wwhey cheaper

[phatdaddy]

I used a CDI switchbox on a 40 hp i had worked great.

So have you definitely determined it is only running do 3 cyl
One box is for the port side and the other for starboard.

Sounds like you are still not sure what your issue is