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Old 02-04-2006, 07:03 PM
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Join Date: Feb 2006
Location: FL
Posts: 1

I have what I believe is a 1982 Merc 50 horse(correction, it's a Mariner if there is any difference?) on a little boat. The engine fires on the top two cylinders, but not the bottom two. It's not something as simple as spark plugs, and/or wires as I've checked that. All four plugs work fine when tested on the good top two cylinders.

Is there any common thing that would cause the boat not to fire on just the lower two cylinders?

Also what is the long plate like thing that everything connects into right on the side of the motor - the coils hook into it, and there are wires coming into it - is it a long CDI or something? Or is it something someone told me is a switch plate? There are I believe 8 wires in one row, and 5 wires in another row (closest to the starter).

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Old 02-07-2006, 10:12 AM
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Join Date: Jan 2005
Location: Lake Placid, Fl
Posts: 2,090

The only way to tell is test the ignition system, stator low and high speed coils, trigger coils, switch box(the thing you called a switch plate) and ignition coils. To test ignition you will need a Mercury service manual and a peak reading voltmeter.
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