Mercury wiring on Force-engine

[The Force power]

never mind

 

[jerryjerry05]

Ok.

 

[Redbarron%%]

Mercury wiring CAN work just fine, but there are some differences.
I have a 95 Force 90 hp Sport jet with Mercury ignition wiring and the #1 and #3 cylinder colors are swapped and the timing bias circuits are different.
I used Mercury CDM modules with the old style trigger coils and flywheel.
In the CDM system the bias circuit is built in the trigger coils and the magnetic circuits are not compatible with the older flywheel.
I am working on verifying the bias circuit this fall, but traveling currently and it has been too hot in Navarre for this old man to work on it much...
When I have had a chance to completely test it out I will post the schematic i used which is basically three diodes and a resistor to offset the increased voltage from the trigger coils as the rpm increases to track the advance curve properly.
The idea is that the trigger for the CDM is about .6 volts and the increasing voltage from the trigger as the speed increases moves the firing point on the voltage ramp advancing the timing in addition to the cam on the throttle.
If anyone has a timing curve for the Force I would appreciate having a copy

 

[jerryjerry05]

That's a heck of an explanation for no question??

 

[Redbarron%%]

The question was in the title.
Maybe someone else searching will find it helpful?
With memory loss that might be me...

 

[The Force power]

Thank you Redbarron%%

My Deleted question was; if there was a wire(s) I needed to jump/connect to make the ignition to spark (like a "73 Merc. 3 Cyl.)

but I found a schematic for it & answered my own question

 

[Redbarron%%]

I am referencing basically the mid 90's Force with CDI and the Mercury (also late force) with CDM modules.
The problem comes with the chance in the late flywheel with the different trigger magnets and trigger pick up coil.
In the late system the bias circuit are built into the trigger where in the CDI the circuit is in the CDI module.
Basically as I understand it each of the trigger leads are connected via diodes that connect through a resistor to the ground so that the negative bias is created to stabilize the timing as the rpm increases.
I am working out exactly how this is done so that the CDM modules are fired correctly.
The reason is that I feel that the CDM are more reliable and easily replaced.
The CDM module are cheap on Ebay and I used Mercury 3 cylinder ignition wiring harness (I think that the ones I used are 50 hp, but I think any 3 cylinders will work.
The colors are different and it took a little testing to determine that #1 and #3 are swapped in color.
What I have to do is determine the exact value of the resistor to ground and if there are any other parts in the circuit that need to be added.
As I understand it the voltage ramps up as the magnet gap nears the trigger point on the coil and when the voltage reaches 0.6 volts the CDM fires, but this point varies with the RPM. The purpose of the diodes is to develop the 0.6 volts at a point determined by the bias resistor which is tied to ground.
I am currently touring the South West and there are more tests required before I have a high confidence in the circuit and it's operation.
If anyone has better knowledge of the ignition bias circuit I would be very glad to hear it.
If you change the flywheel and the trigger coil the required circuit is in the trigger coil.
If anyone has an old one (bad is ok) so that I can dig into it I would like to see one.
Thanks for the attention

 

[The Force power]

Wow!! this is quiet the undertaking/study

Maybe I misled you with my (deleted) question, with the 3 Cyl. '73 Merc. without the control-box hooked-up you had to jump two terminals in the socket/plug to let the power from the Stater to the switch-box.

I was wonder if I had to do this with the '92 Force that has a Merc. ignition, but I found the answer and therefor deleted my question.

But never the less; your findings are very interesting & I'm sure educational to many of us