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Can I assume you meant that the running or parking light is only the one set f lights? When you checked the fuses, did you just check to see if they were blown by looking at them or did you actually test them for voltage on both sides of the fuse using a voltmeter or at least a 12 volt test light?
What fuse did you check?
Also, incase I need to lookup any wiring diagrams, what engine is in this? Plus, is it 2wd or 4wd?