i cant remember for sure on a 91 ranger, but if the headlight switch is on the turn signal, or if the highbeam/lowbeam selector is on the turnsignal that is a good first place to look. i've replaced two turnsignal headlight switches because there was no headlights at all.
There is also a relay for the DRL's but usually thats a complete fail thing if the contacts or coil burns out in it.
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