Question about 1993 Mazda Navajo

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Battery will not stay charged.

I have a 1991 Mazda Navajo. I hooked the battery up to a volt meter to test to see if it was good battery because the battery will not hold a charge. With EVERYTHING turned off, something is drawing a 3 volts then begins slowing recharging. When this happens the voltage does not recharge the full three volts and after a couple of hours the battery will be completely dead. I even swapped the battery for a newer one of the same type to further test this.

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  • NANCYALEMAN3 Apr 27, 2009

    I HAVE ALREADY BOUGHT A NEW BATTERY AND A NEW ALTERNATOR AND BOTH HAVE DONE NOTHING TO MAKE THE PROBLEM BETTER, THE CAR STILL WILL NOT STAY CHARGED....IT WILL RUN AROUND THE BLOCK AND THEN WE CAN COME BACK AND IT WILL BE DEAD AGAIN.

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I would try to read the resistance between the battery cables(plus and minus) with the battery totally disconnected and the key in run position and see if it is <=150 ohms(considered a short).

Posted on Jun 09, 2009

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Hi there.i am checking my dads 1991 ford l8000 dumptruck as its not charging.it has the alternator with the internal regulator.how do i check the out put at the alternator itself?i work on 18 wheelers and...


To check if alternator is charging! Connect a volt meter to the battery and start the vehicle......the volt meter should read above 12 volts, if lower then alternator not charging properly!

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Car battery wont hold charge even while driving


If the volt meter is less than 13 volts the alternator is bad, have it checked at an auto parts store. If it reads 14 volts or more the battery has a bad cell and should be checked for replacement.

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How can i know if my voltage regulator is working, Im not getting any of my lights to work


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Dec 02, 2012 | Cars & Trucks

1 Answer

Battery drains while sitting


Hi Anonymous, perform the following tests:
1. Fill acid type batteries to proper levels.
2. Charge battery overnight at 1-2 amps you need 12.5 volts or better after charging.
3. Hook up battery positive cable, then with your multimeter on the milliamp scale connect one lead to the negative battery post and the other lead to the ground cable. Meter should read 3 milliamps or less, 10 milliamps with a radio, 15 milliamps with radio and CB. If your meter reads higher you need to isolate the circuit by pulling fuses and circuit breakers one at a time and observe meter for drop in aprerage then get out your test light and track down the short in that circuit.
3. Make sure all connections are clean and tight especially the negative cable at "BOTH" ends.
4. Hook up volt meter to battery and start engine, if meter falls below 9.5 v while cranking replace battery.
5. With engine running at 3600 RPM battery should read 14.3-14.7 volts if not continue tests.
6. Unplug voltage regulator from alternator at crankcase by front of primary cover.
7. To test voltage regulator go to: https://www.youtube.com/watch?v=F8EjV0IjW9Q
8. With ohm meter, one lead grounded, touch alternator pin meter should read infinity, if not replace stator.
9. With ohm meter, both leads touching alternator pins meter should read 0.1 to 0.2 ohms on 1989 and later models. 0.2 to 0.4 ohms 1988 and earlier models, if not replace stator.
10. With volt meter set on AC scale, both leads touching alternator pins meter should read
16 to 20 volts AC for every 1000 RPM'S 1989 and later and 19 to 26 volts AC for every 1000 RPMS. If not replace rotor.
17. For a free wiring diagram please visit the website below. Good luck and have nice day.
Harley Davidson Wiring Diagrams and Schematics

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1 Answer

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sounds like an over draw on system
computers need min 10.5 volts to stay alive (working) other wise they shut down
i would start by charging batteries fully and disconect from vehicle for 24 hr
then re check before hooking up if they staied charged batteries are good
then hook up bateries negatives then hook up a voltage meter to performed a parasedict
test other word in series to positive cable on wire and other to battery positive if draw is high
on meter start removing fuses on at a time until voltage on meter drops
you have know located source of draw that is killing batteries know diag that problem
ex . under hood light staies on........glove box stays on.......aftermarket stuff inproperly conected
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1 Answer

Battery keeps losing charge and truck is completely dead. Alternator tested good. Headlights go from bright to regular and then the truck completely dies and battery is dead.


Any altenator can test good and it can be bad
If you have a volt meter do this
Get the engine running first of all
Set the volt meter to the AC mode instead of the DC mode.
Connect the positive probe to the negative side of the battery

Connect the negative probe to the positive side of the battery

If you receive the same volt reading as you did in the DC test as before the Diode inside the alternator is blown
The diode keeps the current flowing one direction making this a direct current flow

When a diode goes bad the current will reverse which causes the AC mode to kick in. The battery will olny charge in the DC mode only

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2 Answers

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1 Answer

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hello there:
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2 Answers

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1 Answer

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