Just look for the smashed wire harness, probably between the new tail lights and the body. Parking light wire is touching the reverse light wire, and only needs to be touching on one side to light up both.

 

I've been doing every day driving like I usually do, and they started doing it tonight. Well, I went to work for 2 days straight and let my wife drive my truck, so I take that back, because it's hard to tell what happened lol She only drove it a total of about 20 miles though lol I don't see how she could've messed something up. She drives it easy and slow because she said that she "can't keep it on the road" lol

 

man ive had like 8 of the 87-96 fords.... everyone of them drove like brand new...just had to hold the steering wheel like 5degress one way....never once had a prob keeping it on the road.....but when someone else drove it ...they would run off th road all the time....... now i cant keep new trucks on the road...

 

but...i would turn your head lights on...and makre sure the reverse lights are lighting up from the short...and not becouse its in reverse.. and then take the tail light out with the lights on and when they go out...you know your getting close

 

are you sure it couldn't be a possible sticking switch, or possibly check the wires that go to the switch and see if they share a common power wire. with some lights on the truck. try disconnecting the reverse switch and turn your head lights on and see if they come on, maybe you can narrow it down between the tail lights and the switch.

what you should do if you have a local library near you, see if they have the automotive manuals from the dealers and shops with wiring diagrams, and make copies if you can. i have done that for my previous car and my truck now and they come in handy, atleast i think they are easier to under stand compared the the Haynes manual. i will have to find them quick and let you know about the wire colors.