1987 Force 50 No Spark

[guaaronteed]

Hi Everyone. Hopefully someone can shed some light on an issue I'm having. I've got no spark on this 1987 Force 50 I just picked up. I hooked up the wiring harness and ignition switch as shown in the first picture. There is no spark on either cylinder when cranking. I have worked on breaker point ignitions on cars and on my larger Chrysler outboard that has a distributor as well as magneto ignitions on small engines, but this seems to be a hybrid of the two with it's two coils and I'm assuming two sets of breaker points and two condensers under the flywheel.

When I test for 12v at the coils, there is none. Should there be constant 12v at one side of the coils or will it come in pulses as the breaker points close? Or do the breaker points just provide a ground when closed? Did I make a mistake in the ignition switch wiring? Where should I test for voltage or resistance to troubleshoot my no spark condition?

Any help would be appreciated!

 

[kbh121956]

Yellow is your S terminal (start) Red - B terminal (power) Green - C terminal (choke) White - one of the M terminals (stop) Blue - the other M terminal (stop) Purple is for your tach, (you have it on the I terminal) I terminal is only used to power Auxiliaries when the key is in the on position. The orange wire is your overheat buzzer. Black wire is ground.

 

[Nordin]

That look like a battery ignition system but the ignition coils are not factory made.

You should have two sets of points under the flywheel, and the coils are feed with 12VDC at + terminal through the ignition switch.

The - terminal at the coils have points connected whitch are connected to ground.

Blue ignition
Yellow start
Green choke
Red power from battery
White not use

 

[Nordin]

Took a closer look at the pic AND there are factory made coils.


There should be constant 12VDC at the + terminal, when the points is closed current flow through the prime winding of the ignition coil.
When the points open voltage is induced in the secondary winding and the plug will spark.

 

[kbh121956]

Thanks Nordin. I wasn't sure!