Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Electronic Control Module
The module uses 6 wires (7 wires on 1975 models). The Red and White wires are ignition feed. The White wire is ignition primary circuit with engine cranking and Red is ignition primary (1.3 ohm resistance) with engine running. The primary current is turned on and off by the control unit through the Green wire between module and coil.
The Orange and Purple wires transmit signal to the module from the distributor stator/magnetic pick-up coil. The Black/Green wire is the distributor ground circuit. The 1975 ECM has one additional power feed wire. A Blue fusible link wire protects ECM from voltage spikes. All other wires are identical.
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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