I need a starter wire diagram to see how to replace

https://faceitsalon.com/1989-ford-f150-starter-solenoid-wiring-diagram-database/

https://automotorpad.com/ford/1136348-ford-f150-starter-solenoid-wiring-diagram.html

https://annawiringdiagram.com/wp-content/uploads/2019/02/wiring-diagram-1989-ford-f150-data-wiring-diagram-site-ford-f150-starter-solenoid-wiring-diagram.jpg

Videos plus diagrams in the images tab.

https://www.google.com/search?q=1991+Ford+Bronco+starter+solenoid+wiring

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The big red wire goes directly to the battery. Just replace it. The contacts on the starter may also be badly corroded and you may end replacing the starter as well

I’m happy to assist further over the phone at https://www.6ya.com/expert/jeremy_d728a59f986299fa

So why do you need a wiring diagram ,their is only one wire from solonoid on starter to the relay ,which depending on model which you havent stated or year ,some have the relay under the bonnet in the power distribution box and some its under the dash ,easy job to do

why do you need a diagram?, if you have a new one, just route and install it just like the old one.

You don't need a diagram.Lift the car disconnect the battery and the wires to the starter solenoid remove the starter bolts and check the shims placement.Replacement starter is reverse to what is listed in removal

The starter has one large cable from the battery positive, and a wire that goes to the solenoid (Part of the starter) that becomes hot when the key ignition is turned to start. This also passes through the neutral safety switch. (So it wont start in gear) Not sure if this is what you need, a little vague.

Your best diagram is the starter itself...make notes on where wires are attached and what you removed from where. Always remove the positive cable from battery before you begin and never allow wires on one starter terminal to touch ones from adjacent terminal when you replace them.
Remember...your starter turns the engine so it can start...it does not start your engine. Always have your battery charged and load tested to avoid changing the starter because the battery is bad.

you really don't need one.....
1.Disconnect the battery
2.locate the starter. If its a v8 itll be on the driver side at the back of the engine beside the oil pan
3.there are two bolts on the bottom of the starter that you need to remove with a 9/16 socket or wrench.(support the starter when you remove the last bolt so the wires don't get broken)
4.observe the location of all of the wires attached to the starter(make a diagram so you don't forget where they go)
5.Remove the nuts that hold the wires on the starter.(make sure the ring connectors and wires are in good shape if you notice any damaged ones they should be replaced)
6. reverse procedure to install new one
..............hope this is helpfull.good luck!