Short Circuit
WARNING: This page is about a different car, the 1995 Jeep Wrangler, 1995 Jeep Grand Cherokee, and 1995 Jeep Cherokee. However, it is still accessible from the selected car via links, so may be relevant.
Place armature in a growler. While rotating armature slowly, hold growler's blade parallel to and touching armature core. Blade vibrates if armature is shorted. Replace shorted armature.