Where is the flasher on a 1998 Plymouth Voyager and how do you replace it?

If you have the owners manual look in there first. In the index it gives the location of the Fuse Box and location of the Relay Box. The flasher should be located in the fuse panel or near there. In the relay box out under the hood [located close to battery] the flasher may be there. It is round about the size of a golf ball and flat on the top. It should say something to the effect of Flasher Unit. Replace the bad one with the same size one.