1994 Ford Ranger my truck wont start and the reverse lights

I have search evrywhere and did everything i can do to fix these problems but it still dont work.
i have changed my battery, starter and alternator and it still dont start what can be wrong

and for the reverse lights i have changed the neutral sfety switch and the lights still dont work
i alrady checked the bulbs and fuses prior to changing the switch.

please help me on these two problems it would greatly be appreciated