79 Mercruiser-120 No spark

[Will Brad]

Changed coil, points, condensor. Put in new plugs. Has power to coil. Won't start. Started before. Removed engine, changed freeze plug. Put in new plugs. Still nothing. It just cranks. Looking for a different wiring diag. then the one in seloc?

 

[uaw9fan]

Re: 79 Mercruiser-120 No spark

Have you disconnected the shift interrupt switch to verify there is no problem in that area.

 

[chiefalen]

Re: 79 Mercruiser-120 No spark

You pulled a plug and cranked it while grounding the plug no spark?

If yes, points to wide?

Condenser could be bad from brand new.

Wires clean all around, grounds also.

Dizzy cap clean inside good connection of rotor.

Plug wires good, one from coil to dizzy good?

 

[Bondo]

Re: 79 Mercruiser-120 No spark

Changed coil, points, condensor.

Ayuh,....

Did you properly Set the Points,..??
Did you set the Dwell,..??
Did you reset the Timing,..??
Is there power to the hot side of the Points,..??

 

[Will Brad]

Re: 79 Mercruiser-120 No spark

To all the people who gave suggestions, finally deciced to purchase a new starter, (stopped cranking). Installed starter and what do you know, it started right up. Thanks for all the help.

 

[Don S]

Re: 79 Mercruiser-120 No spark

Obviously, it was cranking so slow with that bad starter that it wouldn't start.
You do have to get enough rpm while cranking for the engine to actually start and run.

 

[chiefalen]

Re: 79 Mercruiser-120 No spark

Stupid me and i thought he had no spark. I didn't see nothing about a slow cranking starter.

 

[Bondo]

Re: 79 Mercruiser-120 No spark

Stupid me and i thought he had no spark.

Ayuh,...

He never said he did,... Only power To the coil....

 

[Bt Doctur]

Re: 79 Mercruiser-120 No spark

If the solenoid supplies power during cranking ,I guess it could short out and provide no power for spark