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Not sure how your speakers are installed, but Haynes Manual says: Remove speaker screws; pull out speaker; remove speaker wires; installation is reverse.
There is no ground for any of the speakers in a car. You will find to wires that go to the speaker but NEVER have the speaker wires touch any body metal. If you tie any of the speaker wires to ground you will short out the amplifier in the radio. On Ford vehicles the radio outputs are what they call Bridged Tied Loads. The speaker wires are not referenced to ground or battery. If you wish to find out the phasing of the speaker just put a 9 volt battery across the speaker wires and the speaker cone will either advance or retrack. Do this to all the speakers and note what color wir was on the 9 volt battery terminal
AnswerTry to buy ford speaker adapter plugs so you don't need to cut wires and mess the electric system up. You can get them from Ebay or Amazon
You will need to remove the front speaker covers. The speaker covers are held in place with two retaining screws. Remove the speaker retaining screws. Remove the wiring harness from the back of the speakers. Reverse the process to install your new speakers.
Try to use Toyota speaker adapter plugs so you don't need to cut wires and mess the electric system up. You can get them from Ebay or Amazon
The speakers in the doors of a 1991 Ford Ranger are 6-inch speakers.
6x8 door speakers
speaker size is 5x7 but 6x8 will fit Try to use Ford speaker adapter plugs so you don't need to cut wires and mess the electric system up. You can get them from Ebay or Amazon
The speaker can be upgraded to the audio Sony Premium that has 8 speakers. The usual 6 speaker version can also be made use of.
If there are speakers in the rear there are also wires connected to them so find the speakers and you'll find the wires.
Rear speakersFor the extended cab use a Philips screw driver and remove the speaker from the side wall above the jump seat. Disconnect the speaker wires ... and be sure to recognize / mark the negative wire. Unscrew the speaker from the case, screw on new speaker, reconnect the wires to the correct terminal and screw back onto the side wall.
speaker wires