Ok I fixed my problem finnaly had time to work on MY truck in the shop..... hope this helps!!!
1- first of all the diode block.... I could not get any further wiring diagrams regarding this; I am assuming they are just mounted inline and who knows where they are located; this is very unlikely to cause a problem. It simply rectifyes the current so you don't have any upstream issues will all the systems.
2- the DRL module; although the signal lights and connected systems don't opperate anything in the DRL there is no exact wiring diagram or explanation to this connection; I can only assume a minor role and doubt this would cause a problem
Both 1 and 2 I assume would be an issue less than 5%
3- My issue was faulty wiring in the Signal light circuit; as with yours it seems since you fallowed my instructions; my issue was the circuit going down to the Reverse light switch towards the transmission, the wiring had warn through due to a combination of head from the exhaust and wear from the front axle driveshaft/ 4X4 shaft.
Steps to fix:
1- Park vehicle on streight level ground, parking brake, blocks, in gear or park ect "Safe Mode"
2- Disconnect battery Neg connector for safety due to the fact that your hand/arm might be up near the starter and it will be 'Hot'
3- Place front end of vehicle up on jack stands and Block, please do not just rely on a Jack, as some times these cylinders leak and also brace both sides of vehicle to not create a tipping hazard!
4- Get a light, coverals, Creep or peice of cardboard, this should safice for inspection
5- crawl under vehicle to inspect!
What you are looking for: (unfortunately I have a std transmission not an automatic, although there are severe differences I will assume they would be similar and can only explain this one way)
On Driver's side of vehicle you will see the tube for the Clutch slave it comes from the front of the firewall down, overtop of the frame and back into the side of the transmission; it will have a Gold connector fitting approx 3/4" diameter you will see just to the rear of the slave and up more towards where the shift lever exits the top of the transmission the connector for the reverse lights switch.
Fallow this cable back along the frame and up past the 4X D.S. and right hand bank exhaust manifold it will go up into a wiring harness. It will also combine with a blank connector that does not appear to be used for the Standard transmission/ transfercase with manual hubs. It is possably for auto lockers or auto 4X4, I did not take the time to look this up. Hopefully you don't use this and it is warn worse than the reverse lights as was mine.
If you look at and near both the D/S and Manifold check these wires very carefully to see if there is any wear mine had burned through both near the exhaust and D/S but the unused connector was worse.
The Repair of the above problem:
1- Disconnect the reverse light switch and unclip all cable claps ect so this leg of the harness is loose.
2- for ease of repair remember where this harness connect to the main harness body from above it will be somewhere near the a/c compressor and dipstick beside the window washer bottle. With the harness laying loose on the ground remove jack stands and lower vehicle to normal height; stand near the driver's fender and pull the harness with the connector and reverse light plug up through the engine bay and out over the fender to inspect and repair.
3- remove all old tape and wire sheath covering the wires starding at the connector and working up BEYOND the visible damage in the wires
4- I cut off and removed the unused connector as it is doing more harm than good. If you are confident replace or repair the damaged wiring where applicable if not have an electrician help you or do it!
5- Tape up all wires, add new wire sheath (you can buy this almost anywhere wire or vehicle accessories are sold)
6- Re- Route cable to prevent future damage! Basically I routed mine down on the plastic inner fender near the frame fallowing the rear wireing harnessses that go from the outside of the frame through a small hole in the frame (yes the connector fits but be carefull not to break off any of the plastic tabs it is a tight fit) then along the inside of the frame till it jumps accross to the transmission and plugs into the switch.
This way there is no possable future issues due to heat or wear and tear.
I hope this helps
If this wiring looks good then there must be some wires elsewhere in the system that are damaged. Check all areas where exposure to rocks gravel snow ice are found. Sorry but this could be a long hard fix if you are hunting wires on a vehicle. Best results will be found by getting help from an auto mechanic or Explorer 'expert'
Good Luck!
