I haven't had time to find wiring diagrams. I have a lot going on right now and I could really use the help or guidance. This is my first 91 and the wiring is different than the three 92s i've owned. Full disclosure I just got done installing a different motor with the same original complete engine harness. I did a 3g alternator upgrade using the factory alternator charging wire harness from a '95. I was able to use the yellow/white wire with 20ga fusible link from the 95 alternator charge wire harness and solder that to the original yellow/white wire over by the starter solenoid. I completely eliminated the original charge wire, and the yellow/white wire with fusible link that was attached to it. I also did a gen 2 starter upgrade. It will crank, the S terminal for the starter is part of that 95 alternator harness. I can not get power to the fuel pump. If I put power to the pump at the intertia switch it primes. The CCRM is coming on and sounds as it should. Turning on for a few seconds then the fuel pump relay kicks off. This 91 also has a yellow wire with 20ga fusible link that is directly attached to the positive battery terminal. The CCRM will not activate without that wire connected. The brown wire that you connect to the ECM test terminal to get the CEL to flash to count codes should be a ground IIRC but when I check for continuity or use my power probe it isn't. When I have more time I will see if I can get the fuel pump to activate from that ECM test plug, but I need to find a pinout of it. I will also double check the voltage readings at that plug, but I think I had low voltage there. The ground is connected to the back of the intake, the ground that is part of the harness for the ecm test plugs is also connected. I have no clue what i'm missing or what I did wrong. It's not the ecm/ccrm, I have known good spares. Thank you in advance.