Question about 1994 Oldsmobile Cutlass Supreme

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Third break light works but other two dont - 1994 Oldsmobile Cutlass Supreme

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What this eliminated here from your list of problems is the brake light switch - if that failed, all 3 brake lites would be ON all the time, or OFF all the time. Since your 3rd lite works, the problem is in wiring from the one lite (that doesnt work) to the other. The wire to both nonfunctional lites will come from one lite to the other (you must remove the plastic trunk panels and trace the wires). The terminal lite will have just 2 wires (its not the problem). The problem will be in the lite that's been daisy-chained to the other light (the one with 4 wires (2 in, 2 out to the other lite)).
Check the suspected light socket and wires for old repairs that have corroded/fallen off (dont laugh - I've seen it), and general corrosion (the usual culprit). Whatever you find, replacing the sockets for the lite bulbs costs just a few dollars at the parts stores --- if you cant solder wires, use crimp unions (or small wire nuts) and E-tape over them to keep out the weather. The pros will solder (the wires) and heat-shrink the connections to the new sockets. Heat shrink is a type of tubing that shrinks under heat of a heat gun and when properly done, keeps out the moisture.

Posted on Sep 07, 2010

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