2003 Chevrolet Avalanche 1500 Questions

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pulling down the power to my battery at night. Were do I start troubleshooting. The alternator seems to be O.K.
tires inflated properly. no service lights on.
My '03 avalanche has been indicating "service 4 wheel drive" and Im not sure what causes it or what is the fix for it what should I do
I do my emission and safety inspection every year with my 2003 Avalanche and never had a fail for 5 years...until now! The problem was that the check engine light is supposed to illuminate when the key is turned on an...
EVERY 200-300 MILES "REDUCED ENGINE POWER" MESSAGE APPRARS...I CAN LOOSEN RADIATOR CAP AND MESSAGE DISAPPEARS..D I NEED A NEW RAD CAP OR IS A COMPUTER PART GING OUT?
where is the drl resistor
is there a separate rear door lock relay that controlls the rear door lock actuators, and where is it located?
WHEN TURNING STEERING WHEEL LOCK TO LOCK THE BELT SQUEELS. DOES THE TENSION NEED TO BE CHANGED?
I just bought a 2003 avalanche, and I took it to have an emission test done, but the OBD connector was no where to be found, does anybody have a clue where it could be. The manuals that I looked at dont help. And why ...
passenger door power window doesn't work, hear clicking when press the button. How can I figure out if it's the switch or the motor?
Service seat belyt light stays on on DIC Been to the dealer 7 times for repair with no luck.
no power to passenger front door power window, power mirror ,power lock, and interior light not working
parking brake light stays on after release of brake pedal and driven, the chiming was non stop. don't see any leaks of fluid and brakes still feel normal been like this for only a couple of days
Last week my key wouldn't unlock the door. I got in and started it and drove but the A/C wasn't working, windws were powerless. Went to auto zone popped the hood release and the thing started working fine. The analysi...
handheld scanner said multiple cyl.misfire,coilpacks on right side would stall running vehicle if disconnected,left side had no change and would not stall vehicle after disconnecting coil packs.