Article Index

MoPar Electronic Ignition Module Terminals

Terminal
Purpose
Pin 1 12V Power from Ignition Switch I1 (Run)
Pin 2 Connection to coil negative terminal
Pin 3
(only used with dual ballast resistors)
Reduced voltage supply to ignition module
Provides low voltage power for the electronic circuitry
Pin 4 Distributor pickup sensor +
Pin 5
(ground)
Distributor pickup sensor -

 

4-Pin HEI Ignition Module Terminals:

Terminal
Purpose
B Battery
Coil Positive &
12V+ (Ignition Run)
C Coil Negative & Tach
G Distributor Pickup Sensor -
[connects to ECU Pin 5]
Black wire @ Mopar EI Distributor
Brown w/white tracer
W Distributor Pickup Sensor +
[connects to ECU Pin 4]
White/Black wire @ Mopar EI Distributor
Grey w/white tracer

4-Pin HEI Module Pigtails

If you weren't able to get good junkyard connectors with your HEI module, you can buy replacement connectors instead.

Terminals
Pigtail
B & C
Better
Dorman 85841
B & C
Adequate
female spade terminals:
2 x ¼”
W & G
Best
SMP LX309
W & G
Better
Dorman 85841
W & G
Adequate
female spade terminals:
1 x ¼” & 1 x  3/16”.

 

It is crucial to get the correct polarity of the distributor sensor wires.  If connected incorrectly, the engine may still run but very poorly. Don't worry about the color of the wires. The plug on a Mopar EIS distributor has a male and a female connector. The male pin goes to the "W" terminal on the module. To avoid the trial & error method, you can verify that the polarity of the pickup sensor wires is correct  by using an analog voltmeter set in its lowest DC range.  See Chrysler HEI- theory & testing.

  • Connect voltmeter's positive test lead to the positive wire of the pickup sensor & the negative test lead to the negative wire
  • Rotate the distributor in the correct direction and observe the deflection of the meter needle.
  • If the wire polarity is correct, the needle will become negative as the tip of the reluctor tooth approaches the center of the pickup, and then positive as the tooth passes the center of the reluctor and the pole piece.