blowing fuse #4 and no dash or marker lights it all started with melted factory towing harness which is also part of taillight harness cut out connector and repaired wiring now blows #4, 5 amp fuse when nothing is on and smells like circuit board burning inside cab, any help on what to check or do would be oh so helpfull

 

got a MY and trim level & Cab type to go with that question ?

Also, is the trailer tow harness an aftermarket one, as those lights are not part of the trucks on the factory setup.

 

im sorry it is a 97 f150 4x4 extended cab lariat xlt at least thats what it says on the side of the truck and the trailer towing harness appears to be a factory setup but i will say the truck was rolled and rebuilt so who really knows what was put on it

 

Take a look under the truck, there should be a trailer tow adapter wiring that looks like this

 

Another question.

When you have the main headlamp switch in the off position ( not in Autolamp ), do you still have this problem with the fuse blowing ?

I am assuming this is the cab fuse panel, fuse #4, that you are talking about.

This is for the Autolamps, power mirrors, and RKE / RAP.

If this fuse is blowing, it could be incorrect install of the trailer tow adapter, or the autolamp module has taken it's leave.

What exactly did you do when you "cut out connector and repaired wiring " on the melted harness.

 

took the melted factory connector shown in the diagram obove that is circled and butt connected them together with the shrinkable butt connectors when the problem started i also recut all those butt connected wires and the problem persist
and to my knowledge this truck never had auto lamp feature unless it never worked

 

all in all never buy a wreck repair this truck has been a nightmare in the 3-4 years ive had it its been down more then being drove

 

Try unplugging the connector from the truck's harness.

There could be a problem with it still.

On the topic of Autolamp, does the main headlamp **** have on the dial a light bulb with an A in it ?

 

no it doesnt but when i got the truck the guy told me it wasnt the correct headlamp switch

 

and if you are talking about the trailer tailight harness in the pic you sent i did basically unplug all those wires and it still blew the fuse and another note the power mirrors have never worked since i got the truck either

 

You basically unplugged the connector, or you actually did unplug the connector? Simple question really.

 

yes i unplugged the connector and left it unplugged and it still blew fuse #4

 

well im going to start disconecting everything that fuse #4 runs and am hoping to come acrossed something

 

ok i unplugged everything related to fuse number 4 and i found what the problem was doesnt make any sense to me but i found the remote keyless antitheft box is cooked so anybody have any ideas what to do now other then replace the keyless entry box

 

if any cares i got it fixed and it is doing fine now thanks for the help