1998 GMC, 4.3 Vortec. How much voltage should I be getting on the pink wire at the module? I'm getting 12.6.....I tried following a flowchart, but may be getting confused on where and HOW to read for voltage. It says I should have no more than 4.5 volts between pins c9 and d18 of the ECM, but I'm getting 12.6 there, too. I've changed out everything ignition wise but the switch, fuel pressure is hitting 60 lbs while cranking, compression comes in at 175. It acted like it was going to start once yesterday, then stumbled out. I think I'll try a new dizzy gear next. Spark at the #1 plug is really erratic, looks somewhat good, then scatters. I've never had this much of a problem trying to figure out a no start issue.