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I would get the connector apart and dried out as soon as possible to limit the amount of corrosion the water will cause. Also clean up both male and female connector ends and maybe put some silicon dielectric grease on the pins and seal to help prevent future water damage.

Have you tried the 6G Ranger forum? They might have the answer over there.

C422 is the connector that others have had water and corrosion inside. It has contacts for the taillights and the rear parking sensors. Find a way to get it apart to check inside for corrosion or pins that are not fully inserted in the connector shell. The shop manual shows it under the bed of...

Have you checked the wiring harness connectors that feed the lights by pulling the connectors apart and checking for corrosion or damaged connections? Follow the wiring harness from the taillights towards the front of the truck. Pull each connector and examine carefully for issues. You mentioned...

If you have a meter, check for a good ground connection (on ohms scale) to chassis at each taillight connector (pin 1) using the schematic diagram that I posted above.

It is hard to tell from your picture, but I believe that that wire is the battery voltage sense wire which goes to a small connector underneath the battery positive bus-work. I would repair it.

From the 2019 manual.

Here is a wiring diagram for the taillights. There is a ground splice S405 is used for both taillights and license plate bulbs (shown on another diagram. I would concentrate on the left turn signal problem first, and when that is solved, the other issues will probably be solved.

Cargo box power point connector C423. The cargo box power point was optional, but C423 is probably present. A 12 volt power jack (C474) was optional in the bed and plugged into C423..

Here is a link to the Forscan web site. Scroll down to the list of acceptable adapters to use on your Windows computer. https://forscan.org/home.html

I don't believe that the trailer connector will always supply voltage (and current) if certain conditions are not met. When you get out of the truck, is it still running, and has the brake pedal been pressed momentarily while it is running? The truck won't supply current all the time and only...

Using the 7-pin wire with the DC-DC charger with a battery attached, what current is the battery being charged at? Also I understand that the truck must be running, and the brake pedal pressed momentarily to activate the power to the trailer connector.

That cannot be changed in the Ranger. It only applies to the F150.

The battery charging wire in the 7-pin trailer connector is fused at 30 amps (F73 in the BJB) and uses a #10 wire at the 7-pin connector. It starts out at a #6 and ends up as a #10. I would use the right battery + connection as shown in your picture (make sure that it is fused near the battery)...

By any chance is there dirt or grime on the back side of the front door handles or anything touching the back of the door handle when you lock using the outer door handle touch point?

You need to get an approved adapter. See this list on the Forscan web site. https://forscan.org/home.html

Have you downloaded the as-built configuration from Ford? If you have it, can't you configure your module using that?

Thanks. Did the EGR tube replacement finally solve the issue on those trucks? Has it been re-designed?

Just curious, but where did you find the info that Ford recommends the EGR tube replacement? Is it available in a document (TSB)?