Tried to go out twice today - Merc 200 troubleshooting help!

[steplift20]

Power pack That's the culprit

[steplift20]

I had the same problem years ago only mine would be fine than all of a sudden the rpms would cut in half and the oil alarm would sound, found out the powerlpack the w as wired in with the alarm was the one

[garbubba]

Me too, steplift, and that's what I was about to do. although I understand the stator triggers the powerpacks, and could cause the same symptoms, so I'll check that first. I have no problem switching out boxes, but I'm not thrilled with pulling a flywheel off that's been on for 22 years.

[garbubba]

Finally got off my butt, no spark on the port side, all three sparking away on the stbd.

So I check the stator resistance at the red/blue wires next to eliminate it, right?

If that passes I buy two more switch boxes, right again?

thanks,

[spareparts]

swap the stator wire inputs to the switch boxes from onee side to the other, if the problem moves, its the stator, if it stays the same, its the switch box

[garbubba]

Thanks spare, will do tomorrow.

[garbubba]

Swapped the stator wires while I had them off I used my Ohm meter on them, one side was open. Swapped them anyway, and the problem changed sides.

I think I'm going to take it to my repair guy, last time I pulled a flywheel off an old motor it was a mess. Think broken puller bolts, torch, impact wrench....

That way I can be much more sure of the repair.

Thanks, I'd have hated to bought more switchboxes & that not fixed it.

One quick question, along with the red/white wires from the stator, the outer pack had another red/wht wire that came from the timing advance module. When I switched the wires I left that one on the outer box, is that correct or should it follow the red/wht wires?