1997 Hardbody-ECM troubleshooting-Pin info

[greencuda68]

Troubleshooting a 1997 hardbody 4X4 ECM pin voltages. Pin #56 and Pin #61 have no voltage with ignition on (Power to ECM) (Found a blown Fusible link on battery). (Question#1) Pin # 113 is identified in manual as "Current Return" and was also found at zero voltage with ignition on as this is linked to #56 and #61 (Power Suplly to ECM) no surprise here, fusible link blown out. I have smoked two ECM's trying to fix this electrical short circuit. Before I smoke another one, does anyone know if when the ECM is being powered by it's Back-up power pin #70 with no current loop available (Pin #113), could this create an overheat in the ECM (A.K.A. smoke pouring out of ECM with ignition switch in the on position)???? I Thank all of the Electrical folks in advance if any assistance could be provided. I'm hell bent on keeping this Hardbody out of the junkyard......

[Rev_D21]

http://www.nicoclub.com/FSM/hardbody/1997_D21_Truck/
That should help, that's the entire factory service manual right there.

[greencuda68]

Thanks for the manual info.