Question about 1993 Toyota Tercel
I have a new alternator, new starter, and a new battery
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Posted on Jan 02, 2017
Hello! I too am PA St Insp Mechanic.
Here are some suggestions:
Note that the Fuel injection computer starts to cease to work properly at 10.5 VDC. This leads me to a voltage issue. You mentioning that the veh has bright headlamps may be consuming more power than the alt can deliver, with the heater, the lights and the other "normal" draws.
Test the alt output with a voltmeter, plus to plus, minus to minus, at the battery. You should read 14 + volts with all of the above mentioned accessories on, at idle. 11-12 volts = bad alternator, unless the belt is real slipping bad. 14.4 is the spec.
Also, the Voltage Regulator in inside the alternator.
Glad to provide assistance to you; please rate my help with a FixYa, I would be very grateful.
Posted on Jan 22, 2009
SOURCE: Car is dead but battery is good
You should YES check all Grounds Around Battery B U T Also there are AUX Power Cables that go to the Battery Chase them to see that they have NO corrosion or Breaks. It Sounds as though you have a SIMPLE No Power to Accessories type problem.
Posted on Jan 19, 2009
Sounds like you have a power drain, have you installed any new electrical items recently, lift off your Neg batt connection, as you touch it back, is there a spark, if so,this shows a power drain somewhere. Does your battery go flat when car left to stand, or does it go flat regardless of if you run the engine?
Posted on Sep 28, 2009
You need to get someone who knows how to use a Multimeter. It is a device that registers how much voltage, is present at your battery when your alternator is charging. Anyone can use one of these tools and they are cheap to buy, just add some AA batteries. Put the negative lead on the negative battery terminal and the positive lead on the positibe battery terminal, set the device to read Voltage and read the display that tells you how much voltage is present when the car is off, then on, and when you turn on different accessories like head lights, AC, etc. your alternator should produce more Voltage with each new thing you turn on. You will see this voltage go up as you read the multimeter on the battery terminals. If you don't see the Voltage go up the alternator is bad.
Now, likely a new alternator should be good, and you said you had the batter tested, hopefully they knew what they were doing. Lastly, I would unhook the aftermarket stereo for a week or two and see if that solves the problem. Also you should check all connections to the battery and to the alternator to make sure there isn't anything loose, that was the problem on my car, the alternator conector was loose and wiggeling and caused the battery light to come on intermittently. Hope this helps you out!!!
Posted on Oct 17, 2009
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