Question about 1993 Mercury Grand Marquis

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Fuse 9 blows after about 20 minutes of driving with the lights on. Any suggestions?

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Do you have aftermarket headlights with too high a current draw?

What does the owner manual say fuse 9 portects?

Posted on Aug 22, 2010

  • gerry bissi Aug 23, 2010

    OK, rule out headlights.



    Do you have correct amperage fuse in that slot?



    To blow a fuse after 20 minutes means some heat and resitance is building up. Take a close look at the sockets for the brake lights and the high mount stop lamp. Look for corrosion or heat damage.



    I would not supect the instrument lights. Check grounds too.

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