1988ford f250 injector wiring problem

hi-i have just changed cabs on my 1988f250 4x4 with 351 w/auto-used same engine wiring harness and computer-now injectors aren t pulsing-if i use 12v test lite both terminals live even on cranking-engine runs on ether-has good spark and 45 l psi at fuel rail-i tried switching computers to see if faulty but still no fire up (the other computer was a 302 not 351 w just 2 see if it at least fired or pulsed injectors)the cab was off my 1988 f150 with 302 /std and seemed straight fwd-i think i have a ground problem but everything seems grounded and plugged in-any help appreciated as this truck is to plow my driveway and workshop!!!!
cheers
smax

hi
as this new thread i m hoping i set this up properly
can anyone reply to make sure its out there
much appreciated
smax

hi-someone asked who is posting?
i am just a guy with a wiring problkem on my truck and asking 4 help?
are replies automatically added to thread?thanx
smax

turns out no ground on computer terminals 20 and 40
grounded to battery negative and fired up ok
cheers
smax