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Re: 4Runner dies while driving
How did you check the alt on our off the vech if you had checked off the vech thats ok but did you check it while it was on the vech also check for battery voltage at the main post off the alt make sure it shows battery voltage if not will not work . also load test the battery.
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Since the alternator and the battery are both new, there should be no reason the battery is not charging while the vehicle is running. Check the B+ or Output of the alternator. You might offend your mechanic by suggesting this, but it is your vehicle, and electrical things usually equal expensive diagnosis. You can kinda see and feel this area from above, but you really need to be underneath. This is the bolt looking thing on the end opposite to the pulley. This bolt is longer than the area the nut sits AND the nut might be a touch loose. The wires that go on that should have an eye-like end that slides over that bolt and will seat on that location. If this connection was not tightened correctly the alternator can not charge the battery. Make sure there is a flat locking washer and a nut on the end of that bolt. Tighten the nut, but don't go crazy. Firm. Then snap on the insulator cap that is attached to that wiring. Push it until both sides snap. If the insulator is not on correctly, it will come loose. The B+ is a pretty warm place and without that insulator it can melt nearby wiring. Makes a bigger mess if it is overlooked.
If you have changed the battery, have it load tested to make sure it is not defective.
A tech can also check the voltage output and regulator. I am assuming you have already had these two check done as well as ECM error codes. The PCM, powertrain control module would be my next component to have checked. A dealership should have the software to check this. I believe that the OEM part runs around $8 to $900.00 dollars. You may be able to get an aftermarket replacement for around $200, but once installed electrical components are not returnable. Do not get stranded somewhere, have a dealship check this problem out!
have your alternator checked it sounds like its putting out low voltage you can do it you have a volt meter just hook it to the battery terminals you will be looking for a range of 13.5 volts to about 14 volts if your under thirteen its not enough voltage for the car to run and charge the battery at the same time.
If the battery was completely dead, then you either have an immense power drain (unlikely) or your battery or alternator are faulty. When you say you replaced the battery. Was that with a brand new one? Assuming your battery is fine and fully charged, then the vehicle should start. If the vehicle starts, then check your instrument cluster for a charge warning indicator.(typical red battery sign). If this is on, then your battery is not being charged. You can also check with a multimeter across your battery terminals when switched off. You are looking for a voltage around 12.6 volts. With the vehicle running, run the same test across the terminals. A healthy alternator should be charging at anywhere around 14Volts. When running, if the battery voltage is constantly dropping, then you have a faulty charging circuit.
SOUND LIKE FUEL PUMP OR STOPPED UP FUEL FILTER.TURN ON THE IGNITION SWITCH LISTEN FOR FUEL PUMP NOISE.IF YOU DONT HEAR FUEL PUMP RUNNING IN FUEL TANK. REPLACE FUEL PUMP FUSE AND RELAY.IF BOTH OKAY.FUEL PUMP MORE LIKELY THE PROBLEM
if your battery died while driving and the car cut off while your driving,, your problem is from your alternator!!!,, on a normal working car, you can start, remove ther battery terminals and the car would still run cause the alternator will be powering the car. In your case the alternator isnt working and the car was working on battery power therefore when the battery went dead the car cut off.. Your alternator need \s to be charging between 13.5 and 14.2 volts.. as little as 10 volts will keep the vehicle running.. I'd suggest you have the alternator replaced.
It sounds like the Alternator is actually bad. One great way to determine this: Recharge the new battery with a trickle charge overnight. Make sure use remove the wires going to the Battery before recharging. Replace the Battery Wires. Get the Vehicle Started. When it has Started: Leave it Running and Disconnect and Remove the Negative side of the Battery. If the Vehicle dies, it is the Alternator that is bad, and needs to be replaced.. The Battery starts that vehicle, and provides nominal power to certain accessories. The Alternator actual Runs the Engine and Recharges the Battery with a low trickled charge.
I assume your vehicle died because the electronic ignition shut off. One possible cause of this is that the alternator is not supplying any or enough voltage to the battery. Obtain a voltmeter set it to
12 v dc and check voltage of battery it should be above 10 volts in order to start vehicle. If it is below charge or replace battery or just jumpstart vehicle and check voltage while vehicle is running it should be around 13 to 14 volts if alternator is working correctly also make sure all connections are clean. If higher voltage is not present from alternator you have a few options cheapest one first There are replacement brushes available for Toyota alternators dealer item only I am afraid. Or replace alternator with OEM alternator from dealer or reputeable auto parts supply store. That should solve your problem if my assumptions about your problem are correct.
well Marie the reason your vehicle is acting this way is because even though you put new battery in you still have to have a viable altenator to run the vehicle. the battery is only used to start the vehicle and run the radio and lights and other accessories. while the vehicle is running the altenator is not only suppose to charge the battery but it is suppose to supply the amprage to energize and coolapse the coil to give the vehicle spark. a bad altenator while driving doesn't charge the battery it drains it . a quick check is to have the vehicle running and then remove the positive battery cable if it dies you know it's the altenator.... please rate this and good luck keep me posted
The easiest thing to do is to check the generator. If you have a voltmeter, check the voltage across the battery terminals while the car is running. You should get a reading of approximately 14.9 volts which means the gererator is working. With the engine off, check the battery voltage, it should be 12 volts. if it reads less (say 9 or 10 volts), the battery is not holding the charge and needs to be replaced. Also make sure you have good CLEAN TIGHT connections between the battery terminals and the leads. Sometimes a loose connection or oxidation between the terminals and the connector causing a poor connection is to blame.