Have a 03 Trailblazer.No manual. passenger side taillight had moisture in it. dried it out, replaced bulbs. still doesn't work. would like to find the fuse. anyway to get fuse box locations/schematics without buying a new manual?
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it could be a coincidence and you have two bad bulbs. those bulbs function independently of each other so I would check the bulbs and the sockets make sure they aren't rusted or corroded and sometimes they can get leaks and will fill up with water..look for signs of moisture. If your bulbs are good and you continue to experience the problem.. please let me know and I can give you some other things to check.
Have you been driving in heavy rain lately? When I lived in Florida, my '03 PT would regularly have water get inside the rear taillights and shatter the hot bulbs. If this is happening to you, residual water could also be causing an electrical short. While this may not be the cause of your particular short, it only takes a few minutes to remove both rear taillights to examine the bulbs inside. Each of the rear taillight housings are held on by a single screw and a couple of clips. Use a standard screwdriver to remove the screw and make certain not to use excessive force on the clips. If the bulbs are indeed shattered, carefully remove the glass and dry everything completely before installing replacements. I eventually upgraded to LED bulbs because they do not get hot enough to shatter when water splashes on them. LEDs are more expensive, but cheaper than a ticket.
There was a recall on this, see your local Chevrolet dealer....
NOV 01, 2004
2003 Chevrolet Trailblazer
ON CERTAIN SPORT UTILITY VEHICLES, VIBRATION AND HEAT MAY CAUSE THE TAIL LAMP/STOP LAMP BULB TO LOOSEN IN ITS SOCKET. IF THIS OCCURS, THE BULB MAY FLICKER AND EVENTUALLY BECOME INOPERATIVE.
AN INOPERATIVE BRAKE LAMP WILL NOT CONVEY THE DRIVER'S INTENTION OF STOPPING TO DRIVERS IN FOLLOWING VEHICLES, AND AN INOPERATIVE REAR TURN SIGNAL LAMP WILL NOT CONVEY THE DRIVER'S INTENTION TO TURN TO DRIVERS IN FOLLOWING VEHICLES. BOTH OF THESE FAILURES CAN INCREASE THE RISK OF A CRASH.
DEALERS WILL INSPECT THE TAIL LAMP/STOP LAMP ASSEMBLIES, AND IF NECESSARY, REPLACE THEM. THE RECALL BEGAN ON NOVEMBER 22, 2004. OWNERS SHOULD CONTACT CHEVROLET AT 1-800-630-2438, OLDSMOBILE AT 1-800-630-6537, BUICK AT 1-866-608-8080, OR GMC AT 1-866-996-9463.
Potential Units Affected:
GENERAL MOTORS CORP.
Read more: http://www.motortrend.com/cars/2003/chevrolet/trailblazer/recalls/#ixzz2jWJ1eDyR
I own a 97 LS as well and I was going through passenger taillight bulbs too. I found that the water that drained in the channel around the trunk was deteriorating the connectors on the taillight. I replaced the circuit board (black plastic piece you plug the lights into) and also used a can of Electical Connector Cleaner on both the plug to the circuit board and the socket the lights plug into. Lights have lasted now 5 months without burning out.