84' Merc trigger test

[westerman]

Was told if a trigger is bad .....you will loose fire on 1 and 4, 2 and 5 and or 3 and 6. I lost fire on the first.....1 and 4.. swapped trigger and have fire on all but #6. Still a trigger issue ??? Swapped packs and stator...No change.
Help...?
Happy Easter,
Steve Westerman
cell 817 975-3039

 

[Faztbullet]

Re: 84' Merc trigger test

Check bias circuit on packs.....
Intermittent firing on one or more cylinders:
Disconnect the white/black wire between the packs on a 6 cylinder and retest. If all cylinders now fire, replace both packs as there is a
problem in the bias circuitry. On all others, check for low voltage from the stator and trigger. Disconnect the rectifier and retest. If the
problem disappears, replace the rectifier. On 3 and 6 cylinder engines, disconnect white/black wire and check the bias circuit (white/black terminals) resistance to engine ground. Readings should be approximately 15,000W for standard packs and 9600W for racing units. If the readings are correct on the packs, index the flywheel and check timing on all individual cylinders. If the timing varies, replace BOTH packs.

 

[CharlieB]

Re: 84' Merc trigger test

Sounds like you have changed everything except the coil.

Have you checked the coil ground to ensure it is clean and making good contact?

Swap two coils to see if the problem moves with the coil.