Dual Ford F250 F350 Crew Cab 04-08 Boss 12" Phantom Sub Box Ce1250m 1250w Amp "put 4 wheel drive high" Questions

...put it into 4 wheel drive before you start the car our it will not stay on, also to turn it of you need to switch off the van then turn it back to 4x2. Hope this helps but all 4x4s need to be switch ...