The turn signals, headlights work. Changed light switch and tail lights and box lights still donot work. Does anyone know what it could be. I checked all fues and changed some. I am lossed. Thanks Larry|||It sounds like you have a fuse blown, or the wires are worn out.|||its probably a wiring problem. i would suggest having your lights looked at by a pro cuz wiring can be tricky if not done right. also check the bulbs.|||i own a repair shop,and it sounds like its lost its ground wire for the light,s i had this happen a couple of times on the u-haul trailer and truck,s i do some service work for them,and there always having light problems with them,id start checking all the ground wires on it ,id say you,ll find it ,there not hard to find, there are 3 ground points on it,,good luck i hope this help,s|||Dodge man is on the right track. You could possibly have a short somewhere in the main lighting harness. A good quick way to find out is to feel the entire harness from front to rear with the lights on. Where you feel the harness HOT, is where you have your short, usually caused by %26quot;green death%26quot; (corrosion). Hope this helps. Good luck.|||This type of %26quot;body%26#039; has a certain number of wiring problems. The chief offenders are broken wires, floating grounds, and defective %26quot;light sockets%26quot;. The Wires generally %26quot;hang loose%26quot; along the frame, and it isn%26#039;t real hard to run a limb or something up under the frame of truck and rip some of them loose! First thing I would check though, is to turn on parking lights, and run blinkers, and - or stoplights! If you have floating grounds on these sockets or the van body itself, you will get all kinds of unusual operation of the lights. Some things might be --lights going off when you step on the brake , stoplighs might also go out with parking/running lights on, but work normally when no other lights are on! You can check for power on bulb sockets with a test light. Make sure you check with ground on frame, then on %26quot;body %26quot;of van, (or light frames). if the light goes on on frame ground, but doesn%26#039;t on %26quot;body%26quot; ground, your %26quot;box%26quot; has lost it%26#039;s grounding,and you should put several wires to ground in different places(that way you can lose one or two and still be covered).
With a box van you also have %26quot;clearance lights on corners of the box too , - don%26#039;t you? If they are lighting, and your back end doesn%26#039;t,-- the break obviously has to be after the clearance/sidelights branch off the wiring bundle!So your search has been narrowed down a lot!,--If worse, comes to worse, you can run a line from front, - down the frame to the rear at some convenient junction place! Just wrap it around the wiring bunch about every 2 or 3 feet to keep it from drooping down and getting caught on something.
I doubt that you have any %26quot;shorts%26#039;, because shorts blow fuses, or burn wires. But you could have had a short in rear and burned off wire between the front and the rear, so go with care and check for %26quot;big sparks when hooking wires up as %26quot;jumps%26quot; to finish out the circuits! If you have a short with junper in, - you can then start working from back of truck towards the place it is shorted, (that will also be the place it is burned off too (if it got broken that way!)|||Depending upon the year, they hide some under the hood of the truck.. may want to check there.. some are on the left side wall behind the ouside fuse box and are hidden in a box that looks like something else (it%26#039;s only single fuse wide) and is taped up across the center of the box.. has two fuses in there to check...
Don%26#039;t know how the truck is wired since you have a 14 foot box and someone cut into the wiring. but usually the companies all splice off a connector on the back of the frame (where the bumper would normally go) to run the run lights... But they may have accidently spliced from the trailer tow connector instead of the main harness as the trailer tow fuses are the fuses Ford seems to hide in the main fuse box outside and on the side (depending upon the year.. I%26#039;m guessing 1999-01?.... As all fuses are on the dashboard on a 02? and newer and the older trucks had just 2 fuses boxes (one under the hood and one inside)
But after that it would require me to visually find the problem as I%26#039;ve had some newer trucks burn the connector in the back of the fuse box (usually people running way too much lights) and had some with a turn signal switch casuing issues (ususally more turn signals and brakes).. but not having the book or the year in front of me I%26#039;m lost
Hope this helps
