Going Crazy... ECM 1 fuse Blows!

[cwgrl]

Hi all,

I can't find my problem, and I'm going crazy. 1990 V2500, normally run perfect. :-)

On the road last week, and it died. get it home, check fuses... ECM 1 blown. replace..turn key to On position... blows again.

Before the blow, I can hear fuel pump relay click but no fuel pump prime. I changed the relay anyway.

I have traced wiring, everything seems OK. Did the process of elimination with sensors, unplug/plug in... still blows.

What am I missing?

HELP! :-) please Thank you!