1988 MAZDA MX6 ALTERNATOR NOT CHARGING BATTERY

  • Tiny
  • CARLOSGARZA
  • 1988 Mazda MX6

Electrical problem
1988 Mazda MX6 4 cyl Front Wheel Drive Automatic 180000 miles

MY ALTERNATOR IN NOT CHARGING THE BATTERY WHEN THE CAR IS ON. THE BATTERY VOLTAGE WHEN CAR IS ON IS ABOUTN 12.7V AT IDLE. BUT IF BATTERY CABLES ARE REMOVED WHEN THE CAR IS ON, THE VOLTAGE ON THE CABLES GO UP TO 14V. WHY IS MY ALTERNATOR NOT CHARGING WHEN I CONNECT THE BATTERY BACK AGAIN?

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Thursday, March 4th, 2010 AT 11:56 PM

5 Replies

  • Tiny
  • rasmataz
  • Member

Get the alternator and regulator checked out and inspect wiring.

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Friday, March 5th, 2010 AT 12:04 AM
  • Tiny
  • CARLOSGARZA
  • Member

ALTERNATOR AND WIRING TO FUSE BOX AND WIRING TO
BATTERY ALL CHECKED OUT GOOD

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Friday, March 5th, 2010 AT 12:25 AM
  • Tiny
  • rasmataz
  • Member

Refer to the charge system EWD


http://www.2carpros.com/forum/automotive_pictures/12900_c1_26.jpg




http://www.2carpros.com/forum/automotive_pictures/12900_c2_24.jpg

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Friday, March 5th, 2010 AT 12:32 AM
  • Tiny
  • CARLOSGARZA
  • Member

POWER CABLE FROM ALTERNATOR TO BATTERY HAS BATTERY VOLTAGE, SO DOES THE WHT/GREEN CABLE. AND WHT/BLACK ONLY GET BATTERY VOLTAGE WHEN THE IGNITION IS ON. MY CAR HAS NO ABS. AND WHAT IS 4WS RELAY AND TIMER UNIT?

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Friday, March 5th, 2010 AT 12:46 AM
  • Tiny
  • rasmataz
  • Member

Do the test below:

1. Connect suitable ammeter between B terminal wire and B terminal. Be careful not to ground B terminal.
2. Turn all headlights and accessories on and depress brake pedal.
3. Start engine and check output current at engine speed of 2500-3000 RPM. If output current is 65 amps or more on MX-6 and 626 or 60 amps or more on 323, alternator is satisfactory. If not, proceed to step 4.
4. Turn all electrical loads off and release brake pedal.
5. Check output current at engine speed of 2500-3000 RPM. If output current is 5 amps or greater, proceed to step 6. If not, proceed to step 7.
6. Check output voltage between S terminal and ground at engine speed of 2500-3000 RPM. If voltage is 14.1-14.7 volts, proceed to step 7. If not, there is a poor connection between B terminal and positive battery cable, between negative battery cable and battery or between alternator 2 pin connector and positive battery terminal, or stator coils or diodes are malfunctioning.
7. Turn ignition switch On and check voltage at L terminal. If voltage is 1-5 volts, alternator is satisfactory. If not, IC regulator, brush or field coil is malfunctioning.

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Friday, March 5th, 2010 AT 1:04 AM

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