updated more accurate symptoms
-Blinkers.. both L/R blink
-Breaks... seem ok unless maybe dim?
-Running tail lights.. none in back
-Reverse lights .. none
-License light... ok but flickers with turns
-Blinker speed... Starts almost normal speed and speeds up like when a bulb is out.
I am capable of fixing this, but I need drawings and I am having a hell of a time finding Schematics or Assembly drawings showing component locations.
Still plodding away at this.
F-250 2003 7.3L
This seems to be a single point type of failure. Like one point that is common to each of these unrelated circuits has failed causing multiple failures.
Grounds seem to be distributed at each bulb, so the chance of a bunch of grounds lifting at once is small it seems to me.
Maybe a supply voltage wire might be common to all of these circuits?
Or yes, maybe a wire got hot?
Or a wire was already corroded from age and opened up with high current?
So, I have discovered that the truck batteries and the trailer batteries are connected together directly it seems when you plug in. So the truck was probably heavily charging the trailer batteries during the towing.
Like.. the back up lights and also the night time tail lights are both out.
They should have NOTHING to do with each other. SHould be totally different wires and circuits...
Front lights all good. Look fine.
