3406e bad ecm?

Ok, I have searched through the treads similar to this but haven' found anything really solid yet. About to put 3k into a new ecm and programming.

I've got a 97 int 9300 with cat 3406e 6ts. I ran 700 miles on it the other day with no problems whatsoever. However, after dropping trailer and turning into my driveway at home I went to downshift from 6 to 4 turning in. When I tried to rev the motor to downshift it just slowly died and came to stop. Checked all fuel related and was getting fuel no problem. Then I noticed that the dash gauges were cycling but after they did there initial sweep all the engine related gauges were going back to 0 value. EVEN THE VOLT METER. However, after checking ALL of the electrical system (wiring, fuses, breakers, relays, maxi fuses, harness wires) I ended up taking apart and cleaning basically every wire connection and terminal from batteries, to fuse box and to the ecm (EVEN replaced starter because it' has a little growl for the last year). I finally got around to testing the ecm. At he pins going into the ecm 4 and 6 were showing line voltage 12.4 with key on and 5 ground. However, after checking the engine harness wires and verifying no obvious issues I am getting no voltage at the cam sensor and no power to any of the pins at the plug going into the side of the block at the top (12 pins) assumed that was the plug going to the injectors, 1+ and 1- for each? Anyways I got no voltage anywhere I tested beyond the ecm. After taking the ecm out I found corrosion on the engine harness side inside the 40 pin connector that was pretty significant. And went as deep as the pins stuck out of the ecm. Between the dash gauges not working and no voltage on the harness side I am feeling pretty confident in a bad ecm. Is there anything else I should be checking? Just hard to believe that a bad computer took me all the way from ft wayne in to wentzville, mo and back perfectly then couldn't handle 1 last downshift coming into the driveway at home.

ANY AND ALL HELP IS APPRECIATED!!!!

 

Thanks for the information! I will try load testing the circuit tomorrow! Greatly appreciate that info!

 

UPDATE: So, unfortunately heavyd was right... I have a break in a wire somewhere between the fuse box and ecm on the constant power side. Here' my current problem. I can' f8nd a schematic from international for a 97 9300 w cat motor. Or any motor for that matter... I unbolted the fuse panel to see what color the words are coming from the ECM power reed breaker. The wire appears to be tan at the breaker but when I test the wires coming through the firewall I can' figure out which wire it is because none of the tan wires has voltage without the key on. I can' get the fuse panel out enough to really trace that wire without taking the dash out and I can' find a schematic online. I' stuck again. Can anyone tell me where I can get a schematic for a 97 9300?