Motor turns over but it will not start

Theft mode flashes , turn key will not crank or start , can not gain access with scanner. Friend from Ford stopped by and programmed ECM but can't gain access to security theft module. Also can't locate the key ring transciver. Just bought the truck from some people that was swapping computer and stuff trying to get it back running. Sat two years they gave up. I did have it starting and trying to stay running but no fuel was being pumped. Then back in theft all of a sudden. Is there a transceiver ring on this truck from the factory ? And I don't have any info on the fuses and relays.

No ground at passenger compartment #302 relay

Code pcm lost connections
No crank no start

Pcm not working when key is turned on and the transmission indicator not working either originally had no front blinkers found the smart juntion box on pass side corroded cleaned as can not order new one out of stock for a couple months after cleaning got blinkers working but truck will not start

Would I need to get another pcm or check ground on the unit. Fuses are good.

No signal from pcm to activate fuel pump, glow plug relay, air intake heater etc.. .

Trailer brake controller module and check abs system showing in dashboard. No comm on Pcm,Tcm, Abs, Bcm. 1/2 fuse box in engine bay not working

Havin a weird issue with supplied voltage to coils maf and pcm I'd assume too. 12v source to the MAF will jump between 14.2-17.8 and sometimes just goes blank a split second then truck runs terribly and stalls. That only happens while MAF is plugged in. If MAF not plugged in the measured voltage is steady and truck runs pretty smooth can't drive it like that at all but it will idle good. When the Voltage begins to spike the 02 sensor MAF lose signal and stop communicating and 3 transmission codes for speed output shaft speed input shaft speed come up if you attempt to drive it at all. Has brand new 'Hitachi' maf. And the previous one did same thing.