How to fix/ electrical

Hello my name is John and I am working on a 2003 Ford Thunderbird I looked at one of your
forums and it was somewhat similar but this one blows me away I am a very able mechanic the
customer was driving the vehicle it was cold out that day very cold he had mentioned in the 30s
and turn the vehicle off went into the store came out and vehicle turns over does not start so
the customer ends up taking it to a Ford dealership for diagnosis this is a customer I do work
for a lot, the Ford dealership diagnosis the problem with it being the fuel pump, with that being
said that's what was replaced, it gets better though so after doing in R&R and putting a brand
new fuel filter in turn the key off and on first initial turn of the key hear a click no humm,
vehicles turning over at a very fast rate does not even try to start after about 5 minutes of trying
to prime and turnover I go grab my new snap on onboard computer well it tells me absolutely
nothing because its not linking up with the computer ok I'm thinking to myself maybe it's just
ignorance of my own cuz I haven't learn to use the computer well enough simplified went and
grabbed my obd2 it also will not link with the computer now at this point I'm really thinking
fuses or relays more so I checked the fuse box underneath the hood of the vehicle in the engine
compartment check dialed check easy obd2 relays fuses do you name it I've checked it I'm
doing this with a test light and also a multimeter did the central fuse panel whiskey on making
sure everything has power everything is fine except for number 1 and number 2 which have
nothing to do with it whatsoever there is the remote car start and remote coil or something to
that effect ok then I go to the trunk I check every fuse everything's okay granite this panel has 7
or 8 relays and one of the fuses which is a 40 amp is for the central fuse box passenger side
kick panel which I checked and every fuse has power except for one and two during this whole
time plugging obd2 in and out still not linking with the computer still not getting fuel pressure or
getting a the one next to it pump to come on I check the emergency shut off for the fuel drivers
side kick panel tried resetting it again no luck so with that being said I'm back to the relays and
since a lot of relays are similar borrow one out of insignificant spot and put it in the PCMs place
the only thing I have not done is check the wires to the fuel pump to see if they're getting juice,
that still would not explain the scanner not linking up with the computer so there you have it in a
nutshell