1970 Johnson 115 - pulse pack wiring help (no spark)

[ayukna]

I've been beating on my new-to-me 1970 Johnson 115 (#115ESL70D) attached to a 1964 MFG Seacruiser for a few months and can't get spark. When I bought it, the original Motorola pulse pack (I believe it is called the "amplifier" originally) was completely disintegrated and the old owner (nice fellow) gave me the replacement part #398363 for the Wabash pulse pack. I've since worked my way around replacing the bad starter, bad coil (this engine only has 1 coil), most wiring including all battery terminals, etc. but can't a stinking spark to the plugs. It cranks over very strong but nothing is getting to the plugs. I tested the stator and it has the correct continuity, so, my buddy suggested that it could be the pulse pack wiring.

When I bough the "new" (used but tested) pulse pack from the nice folks at South Central Outboards, I asked for a wiring diagram to map the 4 wires the Motorola has to the 7 the new pulse pack has and was pointed to this troubleshooting diagram: https://www.cdielectronics.com/wp-c...Documents/Installation Sheets/IS-511-9701.pdf

This doesn't give directions but I thought it lined up OK. Having tested most everything with the help of a good friend that is very good with 2 strokes, we are at a loss so I'm looking for any pics or wire coded/colored diagrams to line it up properly so I can eliminate this as the issue (and beat my head on a rock to figure out next what the cause is).

Has anyone done this and can take pics or point me in the right direction?

 

[flyingscott]

Have you looked at the points? Have you pulled the flywheel at all?

 

[ayukna]

Have you looked at the points? Have you pulled the flywheel at all?

Thanks for the quick reply!

Yes. The points are relatively new - the fellow I bought it from in April worked on them last Summer - and aren't corroded, etc. The motor hasn't run in about 25 years, mind you, but, that looks decent.

I had to pull the flywheel to fix a corroded reverse switch wire and wire-brushed the flywheel face + stator face while it was off.

 

[ayukna]

Have you looked at the points? Have you pulled the flywheel at all?

Regarding the points, I've read that this "modern" pulse pack/CDI may require a different points setup than the stock one. Any idea if that is true here?

 

[oldboat1]

Do the plug wires have full continuity spring clip to spring clip?

 

[ayukna]

Do the plug wires have full continuity spring clip to spring clip?

I'm not an engine and electric guy but I know we did test the clip end and screw-in end that goes in the stator and all were good. My buddy tested them and he's a 2 stroke guy.

I'm leaning towards the need for a Phase 2 rotor being a requirement for the "new style" CDI/pulse pack and am trying to source one cheap now. That said, I could really use a photo of someone's wiring that has done this on a late 60s/early 70s Johnson 115.

 

[rowerowe101]

I was gonna say check continuity on plug wires and ignition as well, but you said you already replaced ignition, i would still check however. In my experience plug wires always connect from the plug to the ignition coil.. youres plugs to the stator..?

 

[ayukna]

I was gonna say check continuity on plug wires and ignition as well, but you said you already replaced ignition, i would still check however. In my experience plug wires always connect from the plug to the ignition coil.. youres plugs to the stator..?

Ah, I mistyped - my plugs go into the distributor under the stator. There is a single coil that is mounted outside of the flywheel right above the terminal block. My next move is the order the Phase 2 rotor and measure peak output once in place.

 

[ayukna]

^ Bump to see if anyone can post a pic of the modern pulse pack/CDI wiring on this 1970 Johnson 115. Thanks!