I went to start truck this mornning and it was dead. Charged battery all day and went to start truck and all was fine. However now my truck will not stay idle'd and it just keeps dying. Any thoughts on why this may be happening?
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IF THEY CHECKED FOR A DRAW ON THE BATTERY AND THERE WAS NONE DID THEY CHECK ALTERNATOR OUTPUT? IF IT WAS IN SPECS THEN YOU MOST LIKELY HAVE A BAD BATTERY. YOU MAY WANT TO HAVE IT CHECKED AGAIN. THE DEALER IS NOT ABOVE MAKING MISTAKES
It sounds like a faulty alternator, the alternator uses the momentum of the running motor to charge your battery. if this is faulty than the battery will not get charged while running and go flat. use a multimeter to test the battery. or try to jump start the car, if it starts when jump started than you know its an alternator.
Yes I went nuts with the dead battery problem till I found TSB_EL015-03. Seems the frist half of the production year 2003 Tundra has a problem with the tow package relay being left energized if you leave the lights in the daytime running position so that they turn off by opening the door, it will run the battery down. Toyota knows this, won't do a recall, but there is a kit you can get that is listed in the Technical Service Bulletin EL015-3. When it tell you to use a special tool to remove a pin from the large connector (red) don't bother, you will never get it out. Just cut the red wire and use a crimp tool to splice it to the kit's wire. There is no room to work it, just cut it and splice it. http://www.toyotanation.com/forum/123-truck-archive/74107-2003-battery-draining.html
possibly a parasitic drain issue. Have you installed an after-market stereo in the vehicle recently? If so that could be the cause, if not. check things like the trunk light or hood light (if you have one) or anything not so obvious that might not be turning off.
The key won't turn in the door lock? Spray some graphite or lubricant into the lock cylinder and work it some. If you have been using the remote all these year and never the key its probably a little rusty.
The throttle body needs cleaning. It has some carbon build up, and when the battery went dead the computer lost its learned values, one of which is base throttle position. Now its reset back to factory specs, not accounting for a dirty throttle body. Seen it a million times