No Spark and No Power to the Coil... Please Help!!!

[Fish Foot]

1991 mercruiser 502. The motor ran graet till the starter went out. I ordered a starter online and while waiting its arrivail i also changed the very old cap and rotor.

Now with the new starter and new cap and rotor, I have no spark. I tried two different coils before I relized I'm not getting power at the coil. I think the positive lead on the coils should be a keyed on power. Should it not? Ground seems to be constint.

Another thing is I had a real tough time getting the old rotor off. The rotor has some sort of a sprocket on it that passes throu a switch. Looks like for timming advance maybe, but i'm not sure. Would it kill the power to the coil if this switch inside the distrubitur was damaged?

I guess the first thing I need to know is if the coil should show power when the key is on, where is the power coming from? Distrubiter? Starter? Altinator?

Battery conections and starter conections and grounds all are good.

Thanks Fish Foot (spelling is not my friend)

 

[Fish Foot]

Re: No Spark and No Power to the Coil... Please Help!!!

From what I've read it looks like i should have power between the coil posts when the key is on. I have good ground but no power. There are two purple wires on the positive post of the coil. Where do these wires go to?

I will be tracing them while waiting for any help I can get. Thanks

 

[Fish Foot]

Re: No Spark and No Power to the Coil... Please Help!!!

Any help here would be great.

 

[Bt Doctur]

Re: No Spark and No Power to the Coil... Please Help!!!

your coil should have: + side, 2 purple wires .1 is main wiring 12 feed to coil, the other is the main 12v feed to the amplifier.
- side , 2 grey wires.1 is the tach feed, the other goes to the amplifier
Thr rotor and trigger wheel are replaced as a unit, without it there is no spark. The unit in the dist senses the slots and provides the spark at the correct time.