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Generally if your headlights don't work, and the headlamps are still good themselves, the "Headlamp dimmer switch" is the culprit. It is located under the dash, attached to the left side of the steering column. It has a rod coming from the combination switch going into it.

However, this switch only deals with the low/high beam headlights. If your marker lights are also not working then either the park/tail fuse is blown, and/or your headlamp switch is still faulty and needs to be replaced.

The Haynes manual has a wiring diagram for the entire circuit. I'd recommend picking it up.

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Q: Why 1988 jeep Comanche headlights wont work Installed new switch and still not working Now marker lights wont work either?
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