85hp switchbox/powerpack

[<Mo-Mo>]

I finally broke down and took my 76 Merc 85HP to the shop.

He tells me that I need a new switchbox because mine is only firing on two cylinders.

Any idea where the cheapest place to look for these is? Also, how hard are they to install?

[<KeyWest2020>]

If that motor has a single coil and a distributor, then I think the shop is giving bad information. If you have the four coil ignition, then it is possible that either the switchbox or the stator/trigger are bad. If you switch the trigger wires and the same two cylinders fire, then the triggers are good, and the switchbox is bad. If the other cylinders fire, then the triggers are bad, and the switchbox is good.