1984 Chrysler Force 125 (1258x4a) no spark/weak spark on #3&4 cylinders

FrenryFire

Recruit
Joined
Sep 25, 2021
Messages
3
Hi there.
I’ve got a weak/no-spark symptom on my bottom two cylinders (3&4). My ignition components are as follows:
2 black sealed CD boxes
Stator with two green/yellow-striped wires, two yellow wires, and two blue wires.
Trigger unit and 4 coils.
I feel like I’ve got it narrowed down to a stator problem but want to clarify before pursuing a new/used/rebuilt one. With the plugs out and grounded I can see great spark on 1&2, but weak/inconsistent spark on 3&4. With a spark gap tester I can get 1&2 to jump 7/16” but 3&4 can’t even jump 1/8”. After flip flopping the two stator feeds (blue/yellow pairs) to the two CD units the symptoms reverse. Switching the two trigger feeds to the cd units changes nothing.
My main question is how do you test this particular stator for resistance and peak voltage (I have a DVA and multi-meter). I have the manual but it requires the use of an old proprietary tester and wiring adapter harness 👎. The stator supposedly has 3 circuits: battery charge, cd voltage low, and cd voltage high(?). Green/yellow goes to rectifier so it’s battery charge. One blue and one yellow go to each cd box. The stator has some spools of thin gauge wire and others with a thicker gauge of wire.
The best testing guide I can find is this:
And here is my wiring diagram:1632599814600.png
But it is unclear if I’m supposed to read across each blue and yellow pair going to each CD, or across both yellows and then across both blues, or each yellow to ground and each blue to ground? Any info would be appreciated. Thanks in advance!
 

The Force power

Commander
Joined
Feb 3, 2019
Messages
2,350
Welcome to Iboats,
You take the reading across each blue and yellow pair while disconnected from the cd modules
Force

Three and Four Cylinder Engines Using Separate Switch Boxes and Ignition Coils (Continued)

NO FIRE ON TWO CYLINDERS:

  • If two cylinders from the same CD unit will not fire, the problem is usually in the stator.
  • Stator reads 680-800 ohms (factory) and 200- 300 (CDI/RAPAIR) DVA 180V or more
  • From blue to yellow.
 
Last edited:

jerryjerry05

Supreme Mariner
Joined
May 7, 2008
Messages
18,112
outboardignitiondotcom has test procedures for your motor.
Try swapping the packs around and see if the spark changes to the other plugs?
The stator can test good but still be bad :(
 

FrenryFire

Recruit
Joined
Sep 25, 2021
Messages
3
Welcome to Iboats,
You take the reading across each blue and yellow pair while disconnected from the cd modules
Force

Three and Four Cylinder Engines Using Separate Switch Boxes and Ignition Coils (Continued)

NO FIRE ON TWO CYLINDERS:

  • If two cylinders from the same CD unit will not fire, the problem is usually in the stator.
  • Stator reads 680-800 ohms (factory) and 200- 300 (CDI/RAPAIR) DVA 180V or more
  • From blue to yellow.
Thank you very much!! The functional pair of feed wires was 740 but the problematic side was super high 340,000+. Time to shop for a stator…
 

Nordin

Commander
Joined
Jun 12, 2010
Messages
2,614
Are the values you measured resistance?
740 Ohm and plus 340 kOhm.
Looks like the second stator winding is bad.
Check peak voltage with the DVA too.
The voltage is a more true parameter then just resistance of the winding.
 
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