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The left headlight, nor the left plow light work on low beam. Tried a new isolation module and that didn't help. Any ideas?
Try getting a wiring diagram, then fault trace the circuit for the headlight. You might find a free manual here: http://bit.ly/autozone_repair_info or go to http://bit.ly/alldata_repair_manuals or http://bit.ly/mitchell_repair_manuals_online and get an online repair manual subscription.