96 dodge ram 3500, lights

hey guys ...i havent had a post in a long time! I had a customer that came in who attempted to hook up his own fog lights! He tapped into the r.f. parking light for power! it melted the harness that plugs into the back of the head-light switch and blew the turn signal fuse as well as the trailer fuse under the dash! when you replace the main 40 amp fuse as soon as you push/plug it in, the parking lights automatically come on and 2 seconds later it blows the main fuse...what/where are the lights controlled from...any help im sure the customer would be in debt...young kid w/ not alot of money! Thanks in advance for the time and effortM.E.C.P & First-Class

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