Mine is a 1990, beleive it or not, it hooks to the negative side of your coil under the hood facing the front of your truck it will be on the right hand side, (black is ground and red is hot for the light)
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It's an OBD I system, so you can't hook up to the ECM with an OBD II scan tool. Have you made sure the ECM is getting power and ground? Have you ruled out any blown fuses, tripped circuit breakers, or blown fusible links?