One of my answers was that I there may be a bad ground between the engine block and the body of the car. Where does the engine ground to the body of the 1997 Cadillac Deville?
If you cannot find a ground wire between engine and firewall or wing then make a 12 gauge wire and terminal to engine and firewall metal
The one you are looking for most of the time is directly in front of the engine. It goes from alternator to the body via a 6 inch or so wire, that connects to body in front of and near the fuse box. This is the one that usually goes bad, due mainly to vibrations or a bad motor mount(s). Fix the mounts if you change this ground wire or it will break again.
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