i took off actuator and tested with battery charger and it works. however the switch doesnt seem to engage into 4x4. i checked switch. there is a green wire and a black yellow stripe wire. when i check wire the is continuity when switch is positioned in 2wd. whe switched to 4wd then my meter reads differently. what else can i check as i am new to owning a brute force? does the engine brake actuator have to work for the 4wd actuator to work also? also my dash is flashing. it shows 2wd for a second and then 4wd and back and forth. im stumped.