Question about Toyota Tundra

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Alternator and battery check good but battery not recharging

Truck shuts off while driving with dead battery.

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  • Toyota Master
  • 20,706 Answers

Wow , no year car stated, ouch. nor engine option.
ok (ill assume the battery is good and cable lug clean.)

  • engine rpm at 800 or more all time?
  • alternator belt not slipping or belt missing?
  • the dash charge light off running> (and on, keyon, not running )
  • all wires to alternator good. \
  • all fuse in engine bay box good, the big ones.? 50 amps more more?
  • all dash lamps glow like the they should during self test key on>?
  • headlights work and not dim , running engine?
  • battery cables good, not damaged or corroded lugs at 4 ends.
  • by now you have a handle in it.
if not the alternator gave up the ghost or its ground is bad.

Posted on Feb 19, 2014

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6 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

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  • 206 Answers

SOURCE: good alternator & battery, but battery goes dead just sitting

The regulator could be sticking in the alternator. Unplug the alternator and see if the battery goes dead. I replaced an alternator once and the new regulator was bad.

Posted on Feb 15, 2009

csmock132
  • 4669 Answers

SOURCE: Battery dosn't charge, alternator/voltage adapter test's good.

Did you test the Alternator on or off the truck? It might be a problem with the control system to the Alternator. The regulator need a battery feed to work, It is usually ran through an alternator fuse.

Posted on Mar 11, 2009

  • 54 Answers

SOURCE: 2004 suburban 1500 battery keeps going dead

Something is obviously putting a drain on the battery, if all the things you had checked are good. If you disconnect the negative terminal on the battery touch it back, it should spark a little, but not alot. If it sparks quite a bit you know something is staying on that shouldn't. Possibly a glove box light, or if your truck has a light under the hood the mercury switch in it may have gone bad causing it to stay on. If it's taking 8 days to go dead you'll be looking for something small. I hope this helps.

Posted on May 10, 2009

  • 1 Answer

SOURCE: 98 Jetta...stopped while driving

During this past winter, I was driving my 98 Jetta GL and it suddenly shut down in the middle of the road. It restarted but would only go a little ways before doing the same thing. I got it checked out and it turns out I had to get new fuses. I knew someone who could put them in it was very cheap to fix.

Posted on May 11, 2009

  • 190 Answers

SOURCE: 1999 bmw 528i replaced battery and alternator

Replace your battery when its being tested there not testing it under a heavy enough load. A battery could have a dead cell in it and still show good on the charger. I've had that problem a few times.

Posted on Jul 07, 2009

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Truck starts with a boost but once cables are off battery indicator drops then truck shuts down unless engine is revved.


Check the alternator and the charging system. You may have a weak or failing alternator. If you have a voltmeter, get the battery reading with the engine off. A charged, good battery should show at least 12.6 volts. If you have to boost it, it must be low on charge. Recharge it or have it tested, a dead cell in the battery would not let it charge up.
Now take a reading on the battery with the engine idling, or idling as low as possible without dying. A good alternator and charging system will make the battery now read at least 13.5 volts. If your reading is lower than this, you probably have a weak alternator.

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1993 buick lesabre shut off while driving,battery was dead then bought a new battery drove well for 3 weeks then shut off while driving again had to jumpstart it.


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My engine was running and when i turned on my headlights the entire vehicle died. Now i won't even get dash lights to come on? Is this a fuse that i can't find or a relay that needs to be replaced? 96...


sounds like the alternator went bad. and wasnt charging battery, when headlights demanded power there wasnt enough to supply light and motor , so it shut down, recharge battery check battery connections then have alternater check, good luck. hope this helps.

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Truck dies but engine keeps running. battery or alternator?


You need an alternator....well unless your belt came off or got very loose. The truck continued to drive because the battery had enough juice left to run the ignition system, but after you shut it off there was no where near enough to turn the engine over or possibly even run the starter. The battery will have to be charged and a new alternator installed.
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I believe I can help you. There are a few things to check.

First, are you running the plow a lot when you're having these problems? If so, you MAY need to install a second battery designated for just using the plow with it's own alternator. Hydraulic pumps use a lot of electricity to run.

Second, there may be a short in your electrical system, try installing a battery disconnect and disconnect the battery every time you shut the truck off for extended periods of time (more than a day).

Finally, check the voltage regulator (or have a shop look at it). If it is not working properly, the batteries may not re-charge correctly. The cheapest way to solve the problem is with a battery disconnect, but it may get annoying after a while, especially if you forget to disconnect it and your battery goes dead. Finding a short in an electrical system is a long and tedious process that may not always solve the problem. And installing a second battery and alternator for the plow can get expensive.

I hope I could help you with your problem and good luck.

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