2004 Frontier with Both headlights out. Brights

https://knigaproavto.ru/shemy/en/ford/ranger/439-2004-2012-ford-ranger-fuse-box-diagram.html
https://www.autogenius.info/ford-ranger-2005-fuse-box-diagram/

Your second low beam may have burned out last night (that is, you were running on one headlight for a while).

Buy a new headlight (you may have never changed the headlights on a 2004. If you have changed them in the past 3 or 4 years, my solutions is likely wrong.

-mark
Good luck and please rate me.

Could just be the switch or a common negative wire is not grounded good.

Have you considered going back to the place that replaced your motor. They surely are responsible for not making things worse. You just asked for a different motor and not all the electrical issues. Don't throw parts at it.

sounds like the running light module
get new module from salvage yard
buy a chilton book for location
http://www.car-stuff.com/repairmanual.htm

Replace Relay #46 in underhood fuse panel.

Most fog lights turn off when you put your brights on. Check their operation in normal mode first, if they turn off when you turn your brights on... this is normal.

To disable this you need the wiring diagram for your car, you will have to cut 1 wire to be able to have all your lights on at the same time.

Most likely it is the relay which is built into the turn switch. Turn switch will have to be replaced. It is also good idea to replace the flasher as well. Make sure both bulbs are new.

Recheck the bulb number. This happens when the wrong bulb number is installed. Otherwise it could be a bad headlight ground.

Check at the headlight sockets for a bad ground.