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Need wiring diagram for 84 and 88 trucks


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The '84 have three or four wires to the module?


One is power the other two go to the coil - negative terminals. If you have a forth wire, grounding it causes the exhaust coil to stop firing.



The '88 has a CAS so skip that and just find a power source for the module and the two coils that turns on and off with the ignition.

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