Q&A

re start button? maybe inertia switch? if it trips, it may be defective. have a shop check it for you.

Roy

!-2 hours of inspection time should be sufficient to locate the cause of your problems which would be about $180. Then once the cause of the electrical problem is located ( is it a short, a bad connection, a bad module of some kind etc ) then you can precisely determine the cost of the repair.
An electrical problem is solved in 2 steps:
1) find the cause
2) repair the cause

To add to Dan's and Roy's fine advice:

First place I would look is for water intrusion at the fuse box. This can cause many electrical issues, and I have seen it before on several Fords.

Second thing - the turn signals, brake lights, reverse lights AND part of the fuel pump that connects to the inertia fuel cut off switch you mention all utilize ground G300, which could be loose or corroded. It would be worth investigating that. G300 is located right inside the drivers side, behind the trim panel just to the left of your foot.

Clearly a good diagnosis as Dan and Roy mentioned is in order.