1976 Johnson 25 horse ignition wiring?

[gflach]

Hi everyone,

I recently replaced the pickup coil, points, and capacitors on my johnson outboard. Unfortunately, Im not quite sure on the wiring since there are only 2 wire that come off the pick up coil. One is the ground and the other is the power; I think. If theres only one power...then how do both points get power. Ive tried to hook up each wire to each point but alas...no spark. Any help would be appriciated.

 

[jonesg]

Re: 1976 Johnson 25 horse ignition wiring?

Try the FAQ files at the top of the johnson forum,
called sticky files, or top secret files, they're all faq's.

oh here, fer cripes sake.

http://forums.iboats.com/forumdisplay.php?f=31

 

[restornator]

Re: 1976 Johnson 25 horse ignition wiring?

one is ground and the other connects to one breaker point. Each breaker point has a condensor and a lead to the ignition coil. There is a ground wire connecting the throttle cam to the crankcase

 

[gflach]

Re: 1976 Johnson 25 horse ignition wiring?

Makes sense, I think i have it wired up like that...but i still only have spark from one plug and the other is still no good. Ive attached a picture of my wiring ...thanks for the help

 

[bktheking]

Re: 1976 Johnson 25 horse ignition wiring?

Are you sure both external coils are good?

 

[Wover98]

Re: 1976 Johnson 25 horse ignition wiring?

The blue wire with stripe that you have grounded to the screw mounting the coil goes to the other set of points just like the ones on the right side of your pic. The one on the right fires the top jug and the one on the left is for the lower jug. Ground is done via mounging the coil with the screws, no ground wire.

Hope this helps
Will

 

[gflach]

Re: 1976 Johnson 25 horse ignition wiring?

tried intially hooking each coil wire to each point...didnt work. The coil is insulated by plastic so it doesnt touch the metal part. Talked a parts guy at johnson and he said i need 2 coils...which is odd cause when i first took it apart it only had one :S

 

[Wover98]

Re: 1976 Johnson 25 horse ignition wiring?

Only one coil. Both points are wired the same, look at your pic. the one on the right is correct with 3 wires one for the source coil one for the condensor and the other is the lead to the secondary coils mounted on the block.

Wire both points just like this and if still no spark on one cyl ( I am suspecting the lower jug) then have the ignition coil for that jug that is mounted on the block checked/replaced Provided the points are good and set correctly.
I believe you have a pic of the original as well and it shows the wiring done correctly but the source coil was damaged.
The grounding is on the core, the metal portion that the coil is mounted on.

Hope this helps
Will

 

[bktheking]

Re: 1976 Johnson 25 horse ignition wiring?

There are 3 coils actually, 2 spark coils outside of the flywheel and one underneath the flywheel called a driver coil, this system is referred to as a low tension magneto. Wover98 did a good job pointing out the wiring, I missed it. Here is a diagram to help you out.

Move the wire circled in the pic over to the arrow, look at the other points to the right, they are correct.

 

[gflach]

Re: 1976 Johnson 25 horse ignition wiring?

I'll give it a try, thanks for the help

 

[JGeiman2]

Re: 1976 Johnson 25 horse ignition wiring?

What is the gap for the points supposed to be set at?

 

[F_R]

Re: 1976 Johnson 25 horse ignition wiring?

.020" at their widest opening. Are you still fighting that thing? There is an error in the previous posts---it is NOT grounded to the plate at all. One set of points serves as the driver coil ground as the other set opens to fire the associated secondary coil. Then the shaft rotates 180 degrees and the same thing happens on the other side.

BOTH sets of points must be good in order for it to have spark.