It depends on the year and model of vehicle.
In modern vehicles it is simple as finding the relay in the fuse and relay box under the hood and pulling out the bad relay and replacing it with a new one.
In older cars the relays are still under the hood but you will need a book for that car that gives the location you can also try finding that information online there are several good sites but as always the right information is not always free.
On cars or truck made in the 70's and early 80's most were big bulky, most were called solinoids do to the size.
GM located theres on the starter and all it takes is to disconnect the battery and take the starter off. loosen the two bolts on the solinoid pull off the old coil and replace with a new part.
Ford put theirs on the fender wall which side??? well that depend on what side they wanted to put the battery and the starter on. Look at the positive battery cable abd follow it back to a cylindrical device with two big bolts and one or two smaller bolts. The solinoid is held to the fender wall by two or three bolts so disconnect the battery and the disconect all the wires and then the bolts. Then just work backwards in order to put it back on.
Chysler had both types so you will have to look and see which one was used.
Thre starter "relay " is the solenoid on the top of the starter. There is no relay in the fuse block for thwe starter i looked and cant find it there i called a parts store and they said the starter relay is differant than a soleoid The starter relay is under the dash pad just to the right of the instrument cluster. Its a 5pin relay mounted to the dashboard wireing harness
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