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 fuse blows, I can hear fuel pump relay click but no fuel pump prime. I decide to change fuel pump & injector relays, anyway.
I have traced all wiring, everything seems OK. injectors wires good. did the process of elimination with sensors, unplug/plug in... still blows.
What am I missing?
HELP! please
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 fuse blows, I can hear fuel pump relay click but no fuel pump prime. I decide to change fuel pump & injector relays, anyway.
I have traced all wiring, everything seems OK. injectors wires good. did the process of elimination with sensors, unplug/plug in... still blows.
What am I missing?
HELP!
please