Question about 1993 Mercury Cougar

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Headlights go off and on, already changed dimmer switch and fuse

Headlights go off and on, already chnaged dimmer switch and checked fuse under hood

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  • starkman14 May 17, 2009

    Same problems on my '03 Marquis.

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Sounds like the headlamp switch is ffaulty it has an internal breaker that trips on and off check the connector for heat damage

Posted on May 14, 2009

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Diagram of the fuse box under the hood 2007 nissan murano


There is no headlight dimmer fuse. If your bright lights are on it's either a bad switch or a bad headlight control module.

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First check if the fuses have power to them. Hot at all times, so key can be off. If they have power, fuse link is good, so possibly a bad headlight switch or dimmer switch if no headlights..

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Things to check; common wire for ground may be disconnected so take the common wire and run a jumper to the battery.
lights could be bad they wear out too. Substitute
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If the high beam lights work by pulling on the dimmer switch, you are bypassing the headlight switch.
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THE PROBLEM IS THE DASH LIGHT DIMMER CONTROL IS EITHER TURNED OFF OR THE DIMMER IS DEFECTIVE, HAVE SEEN BOTH. THE DIMMER IS NEXT TO THE HEADLIGHT SWITCH

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