1999 Yukon-ECM1 Fuse under hood keeps blowing

[handyrabbit103]

Was driving and lost power, and truck quit. Replaced ecm1 fuse truck started and ran fine. Went to move truck and it blew again. Replaced again, then truck started for about 30 seconds then fuse blew again. Now fuse blows as soon as i turn ignition on.

Any suggestions? Going hunting in 2 days and need to get it up and running.

Thx

 

[JennaBear]

Bad PCM or bad ground would be my guess.

 

[SunlitComet]

check the wiring harnesses for the injector assembly, crankshaft sensor, Ignition control module, ignition coill and pcm for shorted pink wires. They all feed off the ECM-1 fuse.