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The newer trucks seem to hold the memory. I know the earlier ones when they went to OBD2 would lose everything. Most likely the trucks from the mid 2,000's had some sort of memory hold build into the computers. I know my 2015 Power Wagon was fine after I replaced the battery.
Chances are with a dead battery you may of lost all memory. No big deal. You may lose the presets on the radio. It will do a full relearn in 10 to 15 minutes of running. Days of running is BS.
You can jump start it no problem. As said it may run poor until it relearns. Common with relearning is low idle or possibly stalling. You do not have to go to the dealer. If possible I would just put a new battery in it and that way if it does stall you have the power to restart it.
You can still use a test light. Make sure you have a good ground on the clamping end and use the needle probe tip and check both ends of each fuse. Also recheck that pink wire at the brake light switch.
So on slot 1 you had no reading on either side of the fuse? Your volt meter should be black to ground and red to the desired source you are testing. The test light is not used or needed when doing these tests. What does slot 1 say for the fuse application? Is there anything else that does not...
Test all the fuses with a test light or voltmeter. Also make sure the fuse is in there. Do not look at them and say they look ok. You need power on the pink.
First of all forget park lights they are not relevant at this time or on the same circuit. So get a 12 volt test light and see if there is power 12 volts at the pink wire. We will do this one step at a time.
Do both turn signals work in the rear? If so that means the bulbs, wires, and grounds are good from the steering column turn signal switch to the rear of the car. Now you need to test the brake light switch. It there 12 volts on the pink? If no check the fuses. If yes depress the pedal and see...