1993 5.7 Mercruiser aplha 1 wont start

[edrauch]

After a weekend of trouble shooting i've come to you for HELP! I have a 1993 5.7 Mercruiser aplha 1 gen II ( thunderbolt IV) that wont start. It ran perfect 4 days ago! It turns over great and the battery is new and fully charged. I have no spark at the coil. I have good fuel at the carb. I have replaced: coil, distributer cap, rotor, sensor, plugs. (plug wires were out of stock) I have the manuals and know i need 12 v at the coil, I have nothing. What should I look at next? Thanks

 

[Scarab95]

Re: 1993 5.7 Mercruiser aplha 1 wont start

Have you checked the ECM gizmo on the backside of the distributor?

 

[danond]

Re: 1993 5.7 Mercruiser aplha 1 wont start

I believe your coil gets 12v from the post on the starter, or the starter assist solenoid. Maybe try cleaning up all those connections and see if the problem continues.

 

[edrauch]

Re: 1993 5.7 Mercruiser aplha 1 wont start

Checked connections and the ingnition EMC on the back of the distrubutor. Nothing. Next?

 

[Bt Doctur]

Re: 1993 5.7 Mercruiser aplha 1 wont start

Safety lanyard switch
bad /shorted tach

 

[edrauch]

Re: 1993 5.7 Mercruiser aplha 1 wont start

Thanks for your help, I disconected the tach from the coil today.... nothing. I jumped the kill switch....nothing. I pulled it to the shop and dropped it off. Thanks. E