Ok... '78, 4cyl., 50 hp merc. elec. start-- no spark, not even a weak one from the #3 & 4 coils. ~ goin' through it, It obviously needed a stator, so I put a new one on it, even though it ohm'ed out good, it had corroded bare wires (the two yellow/red stripe wires going to the rectifier.) I swapped coils/plugs and plugwires around and still no fire from the coils 3 & 4..... Not the coils. The trigger ohm'ed out good but has a bare/corroded wire (the wht/blk stripe wire to the switch box) and is on order. but since it checked good, I taped it up to continue the diag put the new stator on... still no fire 3 & 4 ( as I expected since the old stator tested ok.) checked all wires from coils to switchbox and grounds--- good shape. whats left? the switchbox? I understand the only method is trying a new one... see if it fixes the problem, but will a switch box cause only two out of four coils to crap-out? Anyway, I have one on order. what are all other possible causes of these two coils not firing besides the coils, plugs/plug wires, stator, trigger and switchbox? Even though the trigger ohm'ed out good, could it still somehow be the culprit or not? even though I've tried to be clear about the fact I'm fighting an electrical problem with no spark from two of the coils themselfs, I probably need to mention that the compression is 122psi EXACTLY on ALL 4 cylinders (very good) I appreciate ANY input, Thankyou.