Question about 2000 Toyota Camry

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Brake light on dash is off and on. Brakes are good. Battery tested good. Alternator passed diode and amperage test, but failed the voltage test on the car. Alternator was removed and bench tested at a local auto parts store. The altenator passed all bench test (voltage, amperage, and diode). What could be the problem? Does this car have a charging relay and if so where is it?

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  • 162 Answers

Check your brake fluid level, play with your e-brake handle.

Posted on Oct 21, 2013


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Posted on Jan 02, 2017

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SOURCE: battery dying

No the alternator won't keep it running on a Toyota, the system is wired much different than most cars, found this out the hard way on same type of car. Test the alternator, raise the idle up to 1500 RPM turn on everything in the car, lites on high beam, ac blower on high, everything, voltage at battery should not be less than about 13.5 volts and not more than 14.7 volts, (clean battery cables first) if all that checks out you have a draw in the system, most common source is the glove box lite or trunk lite, on rare occasions a bad isolation diode in the alternator can cause a voltage draw, another test is to pull off the positive battery battery cable at night and lightly touch it to the battery post, if you see any faint spark there is a draw somewhere in the system, these types of issues can be heck to find, but not always, check what I said to. And last but not least clean the battery cables thoroughly, get a battery brush tool from parts store they are cheap, neutralize any acid with a solution of baking soda and warm tap water.

Posted on Sep 11, 2008

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SOURCE: battery not holding a charge


Normally all circuits should be dead when you switch off the ignition.

Only usual live one, is the radiator electric fan.

You should hear this running after you switch off, for only a short while, if you listen you can eliminate this.

Perhaps glove box, or trunk lights are sticking on ? but normally you only get them if side lamps are on, but still worth checking !

You will have to try disconnecting the battery over a weekend, if it is flat on Monday, it must be the battery.

Good Luck

P.S. Don´t forget to give me a rating please !


Posted on Jan 20, 2009

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SOURCE: 1994 Toyota Tercel Starter Problems

sounds to me that you have an igniton problem not a starter problem and or if you have or had an alarm system could be cause if u do give me feedback and i will explain but seems that your starter is fine from what u say but if you think in terms of the elemts to start a vehicle batery gives pwoer to ignition which sends to starter which gives spark etc i would check you ignition system something is causeing a short and not alowing starter to function

Posted on Feb 10, 2009

  • 158 Answers

SOURCE: charging problem 1990 4runner v6

must be voltage regulater

Posted on May 07, 2009

  • 20 Answers

SOURCE: 87 toyota camry new battery wont keep charge,

Generally if charge light is on, alternator has a bad diode in it. This lets the charged battery lose its power by flowing in the reverse direction. It sounds as the alt., is either not connected right or is swtill bad

Posted on Jan 18, 2010

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I have a 2006 dodge Daytona R/T that the dash board will randomly light up and all the electrical will turn off, headlights, radio, AC, heater, and then come back on it does this at random times and can do...


It would be nice to know what three things they are suggesting as potential solutions, and with little detail to go on I can only give you some ideas, all of which should be tested and verified before doing any repairs.

The problem is most likely a ground or harness connector that is loose or corroded.

I would start by having the battery connections cleaned, test the battery and Alternator, not just a voltage test but a load test for amperage and an alternator diode test.

Bad batteries and alternator diode problems cause a lot of computer related issues including false codes and erratic gauge/light operation, just because a battery starts the car doesn't make it good, its not as simple as that anymore!

Look for grounds near the battery and under the dash near the steering column, anything that is bolted directly to the body, frame or engine block is a ground, with the battery disconnected, loosen and re-tighten any grounds you can find even if they look ok and seem tight, do it anyway, especially the ones near the battery and under the dash.

There can also be problems with the "BUS" that is used for communication between the various modules in the car, causing weird things to happen like what you are experiencing.

Good luck!

Robert Grove, ASE World Class Technician
Orange County Mobile Mechanics 714 709 4594

Mar 10, 2014 | 2006 Dodge Charger

1 Answer

I have 86 thunderbird and the bulb on my dash for the alternator does NOT come on have replaced the alternator 3times and battery chks out good could i have a problem with my ignition switch

Instead of trusting the Gauge, test the Alternator Output. You need to test the Diode/Voltage and Amperage.

If this does not test out good, please contact me..

Apr 16, 2013 | Cars & Trucks

1 Answer

My KIA Spectra 2004 battery charging system problem I need step by step help thank U.

The first step is to check all of the battery cables and their connections. Insure that they are CLEAN and TIGHT (visual and physical inspection should ALWAYS be FIRST).

When you are satisfied that there are no problems with corrosion or loose connections, then you must use a battery load tester to load test the battery. On modern batteries, It is also recommended that you use a battery analyzer that can test the battery impednce. Sometimes a battery will show High impedence - even if it can pass a "load" test. Replace the battery if tests indicate it is necessary.

Please note that the rest of the charging system cannot be properly tested until the battery and the cables are all in good working condition.
Any attempts to check the alternator and its circuits with bad cables or battery are going to be, at the very best, inaccurate

Once the battery connections and battery are in good working order, then the alternator output must be tested. It should be tested for voltage output both at idle and at high RPM with a load applied. It should be tested for maximum amperage output to see if it coinsides with the alternator's amperage rating. It should also be tested for AC current or "ripple", indicating shorted diodes.

If the alternator fails any of the tests, then either the alternator should be replaced or the alternator control and output circuits must be diagnosed and repaired (it depends on WHICH test or tests it fails).

Apr 21, 2012 | 2004 Kia Spectra

2 Answers

New battery keeps going dead.i exchanged later it went dead had alternator checked and it is ok

WEll, something is causing the issue.... First, fully charge the battery, then disconnect the negative and put a volt meter or test light in series (between the terminal and the cable). Disable interior lights, and test for draw of current.
Essentially, if the light lights, too much current is being drawn out of the battery. So, you disconnect fuses, and other items until the light goes out. This should help you find the offending component.

IF no light lighting, perhaps the battery itself has issues. Leave it disconnected overnight, and see if it is discharged...If yes, the battery would be suspect.

There are diodes in the alternator that fail and can cause voltage to be drained. Some tests to the alternator fail to reveal the fault. the best test is an Scope, but you can isolate diodes and test with continuity tester.

Feb 04, 2011 | 1999 Ford Escort

1 Answer

1999 dodge intrepid w/ 2.7 L engine and 280,000 miles. the dashboard battery light came on. i replaced the positive terminal at the battery due to corrosion. the dash light is still on. had both the...

did you have the alternator tested on the car? the alternator may be good but the wiring to it may have a fault, have some one do a charging test on the car, if it still shows that the it is charging have them do an AC current test it could be that the diode is out in the alternator which would cause the light to come on and also the battery to drain when the engine is off. If it is not charging on the car suspect the plug end on the alternator ( we see them fail alot ). there is also a charge fuse might check it. The charging is controlled by the BCM ( body control module). If no charge and plug and wiring are good , fuse is good , suspect BCM......GOOD LUCK

Dec 01, 2010 | 1999 Dodge Intrepid

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Car battery is loseing its charge when left for 48 hours. Alternator chargeing ok at 13.6 amps. No battrey drain indicated when checked with a DMM . Does this indicate alternator diode problem ?

You shouldn't check the amps - they vary according to the status of the battery, you should check the voltage and 13.6 V is way too low - the battery is practically never charged and this is why it fails just by sitting.
Check the alternator and replace it if in doubt.

Jun 15, 2010 | 2001 Ford Focus

2 Answers

Battery light on tested bat and alt both good light still on

If the light is on and the alternator is good then you either have a short to ground in the wire that runs the charge light or there is a diode in the alternator that is bad.The alternator will test good with a bad diode if it is only tested for the voltage it reaches but if you were to check the amperage output it would be down from it's output rating.

Jan 29, 2010 | 2000 Pontiac Grand Prix

1 Answer

New battery when i turn on the heat. my battery light came on? why

The alternator should be tested for its operational value in this case. There may be some issues with the charge rate.

Testing the amperage output of the alternator is good for measuring the amount (not the level) of voltage the alternator can produce. This test can be tricky because if the alternator is weak it can still show it as producing amperage. Which is good, but if the voltage is low, it will still allow the battery to go dead. To check the amperage output of an alternator an amp meter is needed. Once the meter is connected start the engine. Next turn on all electrical accessories and raise the engine idle to about 1200 RPM. The alternator should output the max amperage it was designed to produce. Example: a 90 amp alternator should output about 88 amps. Note: An alternator cannot sustain maximum output for long periods of time. If the alternator is forced to operate at maximum output it will overheat and fail. An alternator is designed to operate at max amperage output only for a reasonable amount of time.

((Connect the voltage meter lead the same way you would in a battery static voltage check, Start engine (do not drive) at engine idle the voltage should be between 13.6 to 14.3 volts. If not the alternator may need replacing.)))

Oct 08, 2009 | 1999 Ford Contour

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My 2000 Mercury Cougar starts ok then after a few minutes the dash gages drop to zero then starts to struggle to keep running then dies and will not restart unless I charge the battery. I was told maybe...

check fuses alternator fuse ,charge fuse.also if that checks out look at the harness for back of alternator is it in bad shape? is there a large wire by it self bolted on the alternator? if so take a wire ,same size,and bolt it on with that wire and run it directley to the positive battery post this will charge battery for now on,but if u dont have a large wire bolted on alternator ,the larger wire that is pluged into the alternator is the same wire ,tie into this wire really good and do the same (run to battery positive post) make sure this plug in is good ,if not u can purchase this at the zone

Jul 04, 2009 | 2000 Mercury Cougar

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