Question about 1984 Cadillac DeVille

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How can i tell if a relay isnt working? - 1984 Cadillac DeVille

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Hotwire it to the battery across diagonal terminals. It should click if these are the coil terminals. If no click, thry the other diagonal terminals. If no click either set of diagonals, the coil is bad. If it clicks, leave it on and check continuity across the other diagonal terminals. If no continuity, the contact wiring is bad. If continuity, the relay is good. Note, a realy that passes thses tests can still have an intermittent problem if the coil is weak. See the last figure in the below post.

Please see my tip at http://www.fixya.com/cars/r6022358-relay_check . These are generic instructions. If you get stuck or need specific instructions for your car, please get back to me with model, year and engine info.

Posted on Nov 13, 2010

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