Ok, so this is kind of an effed up story. Lost the torque converter on my 2000 F-350 7.3. Truck on hoist, drop transmission. Then go through divorce. Truck sits on hoist in my barn for about 8 months, to block my hoist and barn from people my ex might let on it. Anyway, I get the new TC, install it, trans and transfer case back in. Hook up the batteries (I disconnected both grounds before starting the transmission work) Batteries are pretty weak, expected, so I disconnect them, and charge each at 2 amps for a few days to get them back up and happy. They're happy. Turn key, no glow plug light. Tach doesn't move during crank. Hook up Snap-On Solus Edge scanner. Turn on key. Scanner does not recognize that the key is on, so I assume that the computer isn't getting power. It's late so I give up and go home. What I am thinking to do first is to look for and clean up grounds. Anyone know where I should look or if there is one often missed? It was stored inside, so I suppose corrosion on connectors could be present. I know typically no tach means CPS, but I have no power at the OBD port, so I don't think those two are connected, but I could be wrong. Anyone have any ideas? Thanks in advance!

 

Oh and I can get it to "run" on ether.

 

Check powers and grounds at the ECU, then work from there. Check the harness for rodent damage. Check the underside of the under hood fuse panel for corrosion.

Verify all grounds are shiny and spotless and that none are missing/disconnected.

-- Dave

 

Since you disconnected the batteries start there. Are the connections tight and CLEAN?
No WTS light? Check fuse 30 under dash. AND disconnect fuel bowl heater and leave it disconnected.
Once you have the WTS, let the GPR stay activated for a minute or as long as it stays on BEFORE trying to start the truck. I’d also put the charger on the batteries at high amp setting to get the engine turning.
‘I would plug the block heater in, if for no other reason than to “help” the truck start. Report back...