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The advance track is going to shift you into whatever you need so it and when it is being used it will come on to alert you it is on. If you hit ice and slip the light will come on. The ABS will go on when it is activated as well. Again, when you are slipping and breaking, the light will come on saying it is engaging. It automatically pumps the breaks for you to shorten the stopping distance. 4 x 4 I don't think is engaged by anything other than being in 4 x 4 so I see this as your only mystery.
this is probably a fairly simple earth fault. they look far worse and affect far more than you would think. as it affects front lights and rear lights, the most likely cause is a bad earth from the battey to the body. check the earth lead is still bolted tightly to the body and that the area it is connected to is clean and solid metal. if this does not work, track the earth wires from the lights affected to where they bodt onto the body and check these are tight and to clean solid metal as well.
this should sort out the biggest problem, but you may have to check the bulbs as well just to make sure they are all ok.
Check the front tyres for a bulge or twist in them, this can happen if the cords in the tyre break (Have you hit the curb recently?). Also it could be a tracking problem and as you say a ball joint or track rod end/steering rack. Chock the wheels before you jack it up.
check the sensors and connections may have loosened or knocked one loose if they look ok than have truck scanned most auto stores such as auto zone/advanced auto scan for free the trouble code will narrow the problem
first check the sensor wiring at the front wheels behind the rotors is a wire that runs into the hub and out to the abs control unit if the connection is not properly connected or the wire has a break it will erratically set off the abs sensor [check light ] which shuts down the abs module and u have normal brakes if wiring and connections are good have the vehicle scanned the van should have the problem code stored in the computer as a fault problem this will give u a start point most auto stores will scan a vehicle for free and give u the code and meaning such as auto zone / advanced auto check in ur area good luck
you will have to replace the whole regulator. check with your local used parts dealer for cheapest price. those regulators can range from 100 to 300 dollars and in some cause more. also for temp solution shove a piece of cardboard between inside window felt and glass to create pressure. it will help hold it up through the bumps