Low Battery Warning????

Separate the batteries and test them individually with a volt meter. Check all your connections, actually, dont just check them, clean them with steel brush or something similar.

Ya might double check your tensioner/idler too. Turns out half of my battery issues came from a weak tensioner. Found this link http://www.gates.com/tensioner/tensioner_video.html while searching for some answers on google, replaced my tensioner, and... no more squeak, no more low battery problems.

Is the alternator original?

 

I have all the info you need right here, I have to copy and paste the text.

The Battery Supervisor monitors the vehicle battery voltage at all times. The system will activate an audible alarm and a red warning light (LED) for 60 seconds if the battery voltage decreases to the preset level of 12.1 Volts DC or lower. Once the vehicle voltage drops to 12.1 Volts DC or lower and the audible alarm has sounded for 60 seconds, the system will disconnect any accessory circuit connected to the control relay if the engine is not running. After 60 seconds the alarm stops and the warning light (LED) will start flashing until the system is reset. The system is reset automatically when the engine starter is activated. This system is designed to provide adequate voltage for restarting the engine. The control relay doesn't require any voltage to stay open or closed, a voltage pulse is sent to the relay to activate the open or close feature.
The system has a feature that prevents disconnecting accessories while the engine is running. A Normally Closed (N/C) oil pressure switch is used for this purpose.


Trouble shooting


1. Low Battery warning light doesn't turn ON at the preset voltage or below with engine OFF, however all other system functions work as designed.

• Verify the connector (816F) located approximately 6" from the LED is fully mated with the system harness and all other connectors to the system are fully mated.
• Check WHITE wire circuit 11GDC (Pin F on control module connector 815M), using an ohmmeter, verify if the wire has continuity to ground, it must be connected to a reliable chassis ground.
• Disconnect the LED connector (816F) from the main harness. On the LED side of the connector verify the LED is working by using the diode test mode on an appropriate DVOM. If LED doesn't show voltage in one direction and an open circuit in the other, change the LED. If the LED checks OK, verify wires from LED connector (816F) to the control module using a continuity meter. Disconnect connector (815M) from the control module and check for continuity between the LED connector (Pin A) through to the control module (Pin D) and LED connector (Pin B) through the control module (Pin F). If the continuity of all wires is good, change control module.

2. The system doesn't disconnect the accessories when battery is low with the engine OFF, however all other system functions work as designed.

• Verify all system harness connectors are fully mated.
• Make sure the three (3)-pin connector (1255) near the control relay is mated properly.
• Check for constant + 12 volts on the RED wire circuit 14DMH (Pin H) on the control module using a voltmeter. If no voltage, check fuse F10-A in harness, if blown, replace with a 10 amp. fuse. If fuse is good and still no voltage, verify connection of the RED wire circuit 14DAF from Battery Feed pin at the control relay. If not connected or the wire connection is broken, repair appropriately.
• Check WHITE wire circuit 11GDC (Pin F) on the control module connector (815M), using an ohmmeter verify if the wire has continuity to ground, it must be connected to a reliable chassis ground.
• The system has a disabling feature when the engine is running. The wiring from the control module goes through the oil pressure switch (Normally Closed) and then to the control relay. With the engine OFF, using a continuity meter, check the continuity between the control relay BLUE wire circuit 14DMC (Pin C) on connector (1255) and the control module BLUE wire (Pin C) on connector (815M). If no continuity, locate oil pressure switch in the engine compartment and make sure that the oil pressure switch connector (817M) is fully mated with the switch and test the system again. If no continuity, disconnect the pressure switch connector and check the continuity between the Pin C of the control relay and one of the terminals of the pressure switch harness connector (817M). If no continuity, repair wire appropriately. Then check the continuity between the other switch connector terminal and the Pin C of the control module. If no continuity, repair wire appropriately. If all prior tests are good, verify the continuity of the oil pressure switch with an ohmmeter. Connect the two leads from the ohmmeter to the two terminals of the switch; the circuit must be closed. If the circuit is open change the oil pressure switch.

3. The system disconnects the accessories when battery is low, however, no warning light and warning buzzer turn on.
Warning Light

• To test the warning light circuitry, see Step 1 above.

Warning Buzzer

• Verify that all system harness connectors are fully mated.
• Verify the RED wire circuit 14DMG (Pin 3) at the warning buzzer connector (201M) for + 12 Volts using a voltmeter. If no voltage, verify the constant power feed source for broken wire. The power feed comes from the RED wire from the Battery Feed on the Control Relay and through F10-A fuse. Repair appropriately.
• Using an ohmmeter, check for continuity between the BLACK wire circuit 14DME (Pin A) at the control module connector (815M) and the BLACK wire (Pin 1) at the buzzer connector (201M). If no continuity, repair wire appropriately.
• On the warning buzzer connector (201M), using a wire jumper, apply ground to Pin 1. The warning buzzer should function. If not, change warning buzzer. If warning buzzer functioned, change the control module.

4. System doesn't reconnect the accessories when engine is started.

• Make sure the control relay connector (1255) is fully mated with the module harness.
• Using a voltmeter, check on the control module connector (815M) Pin E, you must have +12 volts only when the vehicle engine is being started. If no voltage, verify that the PINK wire circuit 17DSK is connected to the start feed. If connected, verify continuity of the PINK wire between the start feed and the control module (Pin E). If no continuity, repair wire appropriately. If continuity, verify continuity of the GREEN wire from the relay connector (1255) Pin A and the RED wire circuit 14DMB from the control module connector (815M) Pin B. If no continuity, repair wire appropriately. If you have continuity, change control module.

5. The system disconnects the accessories when the engine is running.

• ENGINE RUNNING: Locate the oil pressure switch in the engine compartment. Unplug harness connector from the oil pressure switch. Using an ohmmeter connect the two leads from the ohmmeter to the two terminals of the oil pressure switch, with the engine running the circuit must be open, if the circuit is closed change the oil pressure switch.
• The system disconnect feature has a disabling feature while the engine is running. The wiring from the control module goes through the oil pressure switch (Normally Closed - Engine OFF) to the control relay.
• ENGINE OFF: Using an ohmmeter, check the continuity between the control relay connector (1255) BLUE wire circuit 14DMC (Pin C) and the control module connector (815M) BLUE wire circuit 14DMD (Pin C). If you have continuity with the engine off and did not have continuity with the engine running the switch is working properly and the control module should be changed.

6. With the engine running, the low battery light and the buzzer turn on. After one minute, the low battery light starts flashing, the buzzer stops, however the system doesn't shut down any accessory.

• If the above condition occurs when driving, the battery supervisor is working as designed, however most likely one of these following vehicle problems has occurred:
  • A faulty charging circuit.
  • The alternator doesn't put out enough current to keep up with the actual current draw of the vehicle.
  • A broken wire on the alternator input or output.

7. How to verify the oil pressure switch disabling feature.

• With the engine OFF , locate oil pressure switch in the engine compartment. Disconnect the switch connector (817M) from the oil pressure switch. Using an ohmmeter, connect the two leads from the ohmmeter to the two terminals of the switch; the circuit must be closed (showing continuity), if the circuit is open (no continuity) change the oil pressure switch. If the switch is good, go to next step.
• Make sure that the oil pressure switch harness connector (817M) is re-connected and fully mated with the switch and check the continuity between the control relay BLUE wire (Pin C) and the control module BLUE wire (Pin C). If no continuity, disconnect the switch connector and check the continuity between the Pin C of the relay and one of the terminals of the switch connector. If no continuity, repair wire appropriately. If you have continuity, then check the continuity between the other switch connector terminal and the Pin C of the control module. If no continuity, repair wire appropriately.

 

Here are component locations.