My battery is draining immediately the engine starts
Sounds like alternator (generator) is at fault. Voltage at battery should read about 14 volts when charging. Sometimes onlythe regulator (diode pack) on alternator is at fault some can be changed without having to have a new alternator (not sure about yaris)
SOURCE: battery draining fast
I would check the alternator again, it apparently isn't charging the battery with engine running. You need a volt meter or amp meter to test this. Also does the battery discharge when the car is not running?
SOURCE: electric fans runs after car is shut off, drains battery
Having the fan run on for a bit after the engine has stopped is not abnormal in itself, but 20 minutes sounds excessive.
If the fan does eventually shut off, I'd consider changing the thermoswitch (this is a sensor screwed into the radiator somewhere near the bottom, with a pair of wires connected to it - to change it, you'll need to drain the cooling system).
If the fan stays on continuously until the battery is completely flat, see what happens when you unplug the wires from the thermoswitch. If this stops the fan, you need to replace the thermoswitch. If it doesn't, then you need to examine the wiring associated with the switch and the fan, looking for damaged insulation.
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SOURCE: the battery keeps draining and
This may be over-simplified, but to find the battery drain: Remove the positive battery cable from the battery and insert an ammeter in series beween battery and cable. If something is draining the battery, it will show on the ammeter. Remove fuses one-by-one until you see a substantial reduction in the ammeter reading. That will pinpoint the circuit that is draining the battery. Then troubleshoot until you find the faulty component, wiring harness, etc. Remember there will always be a little bit of drain because of ECM, BCM, radio memory and stuff like that.
SOURCE: battery not charging sometimes, drains out while driving
You have a Bad Belt Tensioner. That is Causing your Problems. If the Tensioner is not Keeping the Belt Tight you will get the Symtoms as Described Above. Please Rate my Solution, I need all the Help that I can Get! Thanks!
SOURCE: peugot expert van draining battery when everything
either change the battery or the alternator,,just either of those,,,if your battery is no good it wont hold charge when started,,,also if your alternator is no good it wont charge your battery when engine is running,,,(it can also drain your battery if faulty)..get a second hand alternator in a breakers yard maybe a batt too much cheaper,,,hope i helped you,,
Please see my tip at http://www.fixya.com/cars/r5925550-dead_battery_troubleshooting . These are generic instructions. If you get stuck or need specific instructions for your car, please get back to me with model, year and engine info.
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