My truck goes dead chronically, I replaced the battery last year. After three months the truck started going dead. I think it might be a short that is slowly draining the battery causing the battery to eventually die?
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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.
You are right to suspect the battery if the weather is hot and the battery is a few years old. You probably have a dead cell and that will prevent you from jump-starting it. It takes at least 10.5 volts to engage the starter. You could disconnect the battery and charge it overnight then check the voltage, but I would lean toward a dead battery from old age and heat. Make sure the connections on the posts are clean before you take the battery out. Could be some hidden corrosion.
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
It is common practice to replace belts that are 3 years or older depending on the type belt it is. The stretch and break over time with heat and cooling that goes on. Some mechanics are not trained in the proper maintainance of belts and hoses You should be having the timing belt change to. I believe if it is the ribbed type belt it is supposed to be replaced at 60 thousand miles. If you don't and the belt fails it's a $3000.00 repair minimum so $200.00 IN maintiance is in my opinion worth it. And belts can just fail even new ones. However you could also have a Tensioner pulley bearing going out causing the problem so I suggest you try a different shop. Hope this helps and thanks for using fix-ya.
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.