No spark, no service manual...

[Mcfltfyter]

I'm trying to help a friend that says he's not getting ignition spark on a 3.0 lx 0K029415. I can't remember where to find service manuals, but the schematic shows the purple wire at the coil, neutral switch, and alternator all tied together. The purple wire shows 1.1 volts, even when disconnected from the alternator. Should this be 12 volts with key on?

 

[Mcfltfyter]

I meant the cutout switch, not the neutral switch.

 

[Rick Stephens]

This is for the V6. Virtually the same on where what color wires go where. What you asked doesn't match enough of the system for a conversation starter.

 

[Scott Danforth]

I can't remember where to find service manuals,

only place you can get Mercruiser service manuals from is http://publications.brunswick.com/

 

[Mcfltfyter]

This is for the V6. Virtually the same on where what color wires go where. What you asked doesn't match enough of the system for a conversation starter.

View attachment 367574

That is definitely not it. This isn't a very sharp picture, but the wire coming straight out of the coil is purple. That purple wire ties into the choke, alternator, cutout switch, and into the harness connector. I'm not certain what the terminal on the alternator is for. Is that switched power from the ignition switch, or is the power from the alternator?

I guess I should have just downloaded every mercruiser service manual I could find back when they were everywhere. Oops

 

[Scott Danforth]

Purple is the ignition circuit. It's used as the excite for the alternator, the power to the choke. It goes up to the MOB switch and then the the back of the key

Wire color is standard

 

[Bondo]

That is definitely not it. This isn't a very sharp picture, but the wire coming straight out of the coil is purple. That purple wire ties into the choke, alternator, cutout switch, and into the harness connector. I'm not certain what the terminal on the alternator is for. Is that switched power from the ignition switch, or is the power from the alternator?

I guess I should have just downloaded every mercruiser service manual I could find back when they were everywhere. OopsView attachment 367575

Ayuh,..... Yer purple wires are powered by the key switch, in the On position,...

 

[Mcfltfyter]

I kinda assumed this was the case. Should be a simple fix. We will likely be replacing the impeller that he claims is original from the late 90's. I guess the 3 years or 200 hours is pretty conservative...

 

[Mcfltfyter]

It was a bullet connector at the kill switch. The connector was warm to the touch after 10 minutes of key on. It didn't even look corroded.