Headlights keep switching from drive lights to headlights

this indicates a problem battery (have a load test done on it) , drive belt adjustment or condition or problem alternator out put
with the head lights on there is insufficient capacity from the battery and/or alternator to keep everything running as it should

Consider the dimmer switch on the steering wheel; the wires from it wouldn't affect the tail lights, but could possibly affect the headlights. Hopefully loose wires from the assy is the problem.. replacing the unit might be difficult. or expensive.

Spray electrical cleaner in where the emergency flasher switch is. Turn it on/off rapidly several times. Spray into the directional switch, too. Dirty contacts there are a common source of trouble. Might need a new multi-function switch if cleaning does not fix it.

you need a turn signal switch. i know it sounds wierd but thats what controls it all for the rear of the truck also very common in chevy products

Hi, diagrams are pasted below. I recommend you pull the signal switch out and troubleshoot the connector there. Please let me know if you have questions, and thanks for using FixYa.

well try this it would make you laugh if this work check your floor brake pull up on it all the way and see if it comes on when the park brake is on they turn the lights off and if there not up all the way it will keep it from coming back on. hope that works for ya.

Does the turn signals or hazards work in the rear?? Yes... it may be the brake switch or the turn signal switch (power goes from battery, to the brake switch then to the turn signal switch, then to the lights. No? .. again.. possibly turn signal switch or the wiring between cab and bed.

It's unlikely the turn signal switch. Try disconnecting the switch mounted directly above the brake pedal. If the light turns off the problem is in the brake switch. They commonly go bad and can be picked up at a gm dealer for about $15.

their is another fuse box in the engine compartment check that as well

please check your brake light switch located near the brake pedal. it could be faulty.

tnx 4 using fixya,

drcool