1968 johnson points conversion?

[wanabbtguy]

boating season is almost upon us here in NM!
I have 2 1968 johnson 100hp outboard engines. last year i went through 2 pulse packs, and am now on my 3rd. as you know those packs are'nt cheep!I had a mechanic look it over, but he could not figure out why the packs were going out so often. he mentioned converting the firing system to just points!to eliminate the pulse pack. Has anyone heard of this? he swears by it for these old johnsons. any suggestions would be appreciated.

 

[tashasdaddy]

Re: 1968 johnson points conversion?

corroded connection, dirty connections, create resistance, connecting battery cables backwards just for a second, all can be contributing factors to blowing these. loose battery connections.

 

[wanabbtguy]

Re: 1968 johnson points conversion?

so you would not recommend converting ? is it possible to convert?

 

[F_R]

Re: 1968 johnson points conversion?

so you would not recommend converting ? is it possible to convert?

I don't think is is possible, but if you want to do it, have your guy do the job if he thinks he can. I suspect the crankshaft might have to be changed, among other things. Maybe he has a way??

 

[Chinewalker]

Re: 1968 johnson points conversion?

Thinking out loud - would it be possible to take the upper end cap from a later CD4 style V4 (1979 & up) to mount the later style trigger and stator, fabricate a bracket to hold the coils & packs, swap on the matching later flywheel? I guess you'd have to figure out how to advance the timing and throttle butterflies, as the carbs are quite different, but I did get to wondering. Seems to me it could be done to the 3-bangers easier, and maybe slightly later V4s with what would be come the carb standard for the next generation of crossflows....
- Scott

 

[F_R]

Re: 1968 johnson points conversion?

I'm thinking a lot of stuff has been done by some of our more creative people, but this idea is going to cost more than the motor is worth. That throttle set-up alone would be a killer.

 

[dakotaman]

Re: 1968 johnson points conversion?

i have a 1968 v4 100P and i have no sparl now i have replaced the coil and i tested the cap, rotar, and distibutar and it all seems just fine. no i have power to the coil from the gray wire from my ignition witch it then goes to the pulse pack so i have power into the pulse pack but none of the wires coming out of it have any power...is there a way to test the pulse pack????if the pulse pack is bad will that cause loss of spark????any help would be aprecaited. thanks

 

[F_R]

Re: 1968 johnson points conversion?

Well, if you haven't blown the pulse pack yet, you probably will before you are done. Tests should only be done by the book. And the book doesn't even cover modern troubleshooting methods using a DVA meter.

A DVA meter is the way to go. Along with proper instructions.

FYI, there is not supposed to be any power going to the coil by way of the gray wire. That wire is for driving a tachometer and is not to be connected to anything at the control end unless you have a tachometer. Furthermore, tachometers that will work with that hookup are no longer made.

 

[dakotaman]

Re: 1968 johnson points conversion?

so that gray wire dosent go from the + on the coil to the ignition switch??? according to my wiring diagram it does and then there is a green wire on the same + contact on the coil that goes to the pulse pack so im not sure, wen i got this boat the ignition switch was removed. and if my pulse pack is bad will that prevent spark??what does the pulse pack do???

 

[F_R]

Re: 1968 johnson points conversion?

so that gray wire dosent go from the + on the coil to the ignition switch??? according to my wiring diagram it does and then there is a green wire on the same + contact on the coil that goes to the pulse pack so im not sure, wen i got this boat the ignition switch was removed. and if my pulse pack is bad will that prevent spark??what does the pulse pack do???

Read again what I said. I said power doesn't go to the coil thru the gray wire. I also said the gray wire is not connected to anything up near the ignition switch unless you have the (special) tachometer.

The pulse pack receives 12 volts from the igniton switch (red wire) and amplifies that 12V to 300 volts. It then stores the 300V in a capacitor. When it is time for a spark to happen, the sensor on the timer base, under the distributor cap, sends a signal to the pulse pack (blue wires). That signal triggers an electronic switching device within the pulse pack, which turns "on", releasing the 300V stored in the capacitor. The 300V goes out through the green wire, to the primary winding in the coil. The magnetic field around the primary winding induces a much higher voltage in the secondary winding. That very high voltage is fed to the distributor, which directs it to the proper cylinder, where it jumps the spark plug gap, setting fire to the fuel mixture within the cylinder. The whole thing, from timing signal to spark happens nearly at the speed of light. And THAT is why it takes a special instrument to detect it. That instrument is called a DVA meter.

 

[royal0014]

Re: 1968 johnson points conversion?

, wen i got this boat the ignition switch was removed. :

I hope you used the correct switch....an automotive switch would BAD news!

 

[dakotaman]

Re: 1968 johnson points conversion?

ok i understand now. yea i have a marine ignition switch i got for it but i was under the impresion that the gray wire runs power to the coil cause thats what my wiring diagram shows. thanks for the help. im sorry for not understanding rite away i am very good with motors and stuff but this is the firfst outboard im working on. thanks againg guys i will keep you updated.

 

[dakotaman]

Re: 1968 johnson points conversion?

hi there guys i was just wondering if you would be able to tell me if the wiring harness from a 1968 johnson 100hp would be the same as a 1968 evinrude 100hp, all the controlls for the throttle look the same but im not sure about the wire harness.. thanks any help would be nice.

 

[F_R]

Re: 1968 johnson points conversion?

Yes, same motors, different hoods and remote controls. But the remote controls are swappable too.