9120Powerware batteries I replaced all the batteries (20) and still get the battery disconnected reading.

Check the readings battery are 12.5 V, and the alternator should read 14.5.

Read this on the problem of battery disconnection Battery Disconnect or Replacement Problems

Alternator is not charging, if you got a reman it should be under warranty and if a shop put it in they should be able to test for free

it does not sound like a battery problem from the info provided. It sounds like your battery terminal post is not connecting at the battery. A cable may have a bad connector end on it and the car runs on the alternator once started. Buy a ten dollar volt/ohm meter and check the ohms resistance in the cables by removing the cables from the battery first and then connecting the test leads to the ends of each cable. The meter should read the same as if the leads we're connected to each other. To test the battery change the ohm meter setting to read volts DC in the 20 to 50 volt range and connect red to positive ( + ) side of battery and black lead to negative side ( - ) of battery. Battery must read more than 11 volts for most modern cars to engage the starter circuit, most working batteries will show more than twelve volts. Jump Start the vehicle with the battery connected and with the booster battery disconnected again test the voltage and it should read 14.5 to 15.5 volts. you may need to replace one or both cables or have the ends at the battery replaced. obviously the cables that run the starter are good or a booster battery would not work either. good bluck.

Many batteries may only last around three years. Check battery voltage at rest before starting. Any voltage in the low 12v range may be a sign of a faulty battery.If low voltage present, then perform a parasitic drain test:1) Disconnect battery POSITIVE terminal and connect ammeter in series, between battery positive terminal and positive lead.
DO NOT START THE VEHICLE!!

2) With all vehicle doors closed, alarm off, lights off, radio off, and all other accessories off, wait for around 20 minutes and then read the ammeter. A healthy system should read about 0.03 amps and little more. If reading more, then the vehicle could be suffering a parasitic amp drain, and you will need to locate this issue.


3) Reconnect battery when finished.


If no major parasitic drain present, yet low battery voltage then:


4) With vehicle started, check the voltage charge from the alternator. Connect voltmeter to battery terminals and take reading. A healthy system should be charging in the range of 14volts or down to around 13.5 volts. If reading around 12 volts only, then check and replace alternator.

Ford Excursion, Expedition, Lincoln Navigator 2000-2005
Starter

• REMOVAL & INSTALLATION
• TESTING & TROUBLESHOOTING

Print

Removal & Installation

1. Before servicing the vehicle, refer to the precautions in the beginning of this section.
   
   Negative battery cable
   
2. Raise and safely support the vehicle.
3. Remove or disconnect the following:
   NOTE To disconnect the hard-shell connector from the solenoid S terminal, grasp the plastic shell and pull off; do not pull on the wire. Pull straight off to prevent damage to the connector and S terminal.
   
   
   Starter terminal cover Terminal nut and separate the battery starter cable from the starter motor Solenoid S terminal connector, if equipped with a starter mounted solenoid
   
4. Remove or disconnect the following:
   
   Starter motor retaining bolts Starter motor from the vehicle
   

To install:

1. Install or connect the following:
   
   Starter motor and retaining bolts. Tighten the bolts to 15-20 ft. lbs. (20-27 Nm). Bttery starter cable and a terminal nut to the starter motor. Tighten the terminal nuts to 79 inch lbs. (9 Nm). Slenoid S terminal connector, if equipped with a starter mounted solenoid Sarter solenoid safety cap, if equipped
   
2. Lower the vehicle.
3. Remove or disconnect the following:
   
   Ngative battery cable
   
4. Start the engine several times to check starter motor operation.

1. Before servicing the vehicle, refer to the precautions in the beginning of this section.
2. Remove or disconnect the following:
   
   Negative battery cable
   
3. Raise the front of the truck and install jackstands beneath the frame. Firmly apply the parking brake and place blocks in back of the rear wheels.
4. Remove or disconnect the following:
   
   Wiring from the starter motor terminals Starter motor retaining bolts, loosen Starter retaining bolts while supporting the starter motor Starter from the vehicle
   

To install:

1. The installation is the reverse of removal. Tighten the starter retaining bolts to 15-20 ft. lbs. (20-27 Nm)

4.6L, 5.4L & 6.8L Engines

1. Before servicing the vehicle, refer to the precautions section.
2. Disconnect the negative battery cable.
3. Raise and safely support the vehicle.
4. Remove or disconnect the following:
   NOTE To disconnect the hard-shell connector from the solenoid S terminal, grasp the plastic shell and pull off; do not pull on the wire. Pull straight off to prevent damage to the connector and S terminal.
   
   
   Starter terminal cover Terminal nut and separate the battery starter cable from the starter motor Solenoid S terminal connector, if equipped with a starter mounted solenoid
   
5. Remove or disconnect the following:
   
   Starter motor retaining bolts Starter motor from the vehicle
   

To install:

1. Install or connect the following:
   
   Starter motor and retaining bolts. Tighten the bolts to 15-20 ft. lbs. (20-27 Nm). Battery starter cable and a terminal nut to the starter motor. Tighten the terminal nuts to 79 inch lbs. (9 Nm). Solenoid S terminal connector, if equipped with a starter mounted solenoid Starter solenoid safety cap, if equipped
   
2. Lower the vehicle.
3. Connect the negative battery cable.
4. Start the engine several times to check starter motor operation.

6.0L Diesel Engine

1. Before servicing the vehicle, refer to the precautions section.
2. Disconnect the battery ground cable.
3. Remove starter solenoid protective cap.
4. Disconnect the starter motor electrical connections.
5. Remove the bolts and the starter.

To install:

1. Installation is the reverse of the removal procedure. Tighten the starter bolts to 18 ft. lbs. (25 Nm)

7.3L Engine

1. Before servicing the vehicle, refer to the precautions section.
2. Remove or disconnect the following:
   
   Negative battery cable
   
3. Raise the front of the truck and install jackstands beneath the frame. Firmly apply the parking brake and place blocks in back of the rear wheels.
4. Remove or disconnect the following:
   
   Wiring from the starter motor terminals Starter motor retaining bolts, loosen Starter retaining bolts while supporting the starter motor Starter from the vehicle
   

To install:

1. The installation is the reverse of removal. Tighten the starter retaining bolts to 15-20 ft. lbs. (20-27 Nm)

Testing & Troubleshooting

Feed Circuit Test

1. Make sure the battery is fully charged.
2. Disconnect the Inertia Fuel Shutoff (IFS) switch.
3. Connect a remote starter switch between the starter solenoid S-terminal and the battery positive (+) terminal.
4. Connect the Rotunda 73 Digital Multimeter positive lead to the battery positive (+) post. Connect negative lead to the starter solenoid M-terminal.
   
   

   Fig. Motor feed circuit-S-terminal (1), remote starter switch (2), battery (3), Rotunda 73 digital multimeter (4), B-terminal (5), M-terminal (6)
   

5. Engage the remote starter switch. Read and record the voltage. The voltage reading should be 0.5 volt or less.
6. If the voltage reading is 0.5 volt or less, go to the Motor Ground Circuit Component Test.
7. If the voltage reading is greater than 0.5 volt, indicating excessive resistance, move the Rotunda 73 Digital Multimeter negative lead to the starter solenoid B-terminal and repeat the test. If the voltage reading at the B-terminal is lower than 0.5 volt, the concern is either in the connections at the starter solenoid or in the solenoid contacts.
8. Remove the cables from solenoid B-, S- and M-terminals. Clean the cables and connections and reinstall the cables to the correct terminals. Repeat Steps 3 through 6. If the voltage drop reading is still greater than 0.5 volt when checked at the M-terminal or less than 0.5 volt when checked at the B-terminal, the concern is in the solenoid contacts. Install a new starter motor.
9. If the voltage reading taken at the solenoid B-terminal is still greater than 0.5 volt after cleaning the cables and connections at the solenoid, the concern is either in the positive (+) battery cable connection or in the positive battery cable itself.
10. By moving the Rotunda 73 Digital Multimeter negative lead toward the battery and checking each mechanical connection point, the excessive voltage drop can be located. When the high reading disappears, the last mechanical point that was checked is the concern. Repair or install a new connection as required.

Ground Circuit Test
A slow cranking condition can be caused by resistance in the ground or return portion of the cranking circuit. Check the voltage drop in the ground circuit as follows:

1. Disconnect the inertia fuel shutoff switch.
2. Connect a remote starter switch between the starter solenoid S-terminal and the battery positive (+) terminal.
3. Connect the Rotunda 73 Digital Multimeter positive lead to the starter motor housing (the connection must be clean and free of rust or grease). Connect the negative lead to the negative (-) battery terminal.
   
   

   Fig. Motor ground circuit-Rotunda 73 digital multimeter (1), battery (2), S-terminal (3), M-terminal (4), B-terminal (5), remote starter switch (6)
   

4. Engage the remote starter switch and crank the engine. Read and record the voltage reading. The reading should be 0.2 volt or less.
5. If the voltage drop is more than 0.2 volt, clean the negative cable connections at the battery and body connections, and retest.
6. If the voltage drop is greater than 0.2 volt, determine which way the current is flowing in the cable.
7. Connect the Rotunda 73 Digital Multimeter positive lead to the end of the cable nearest battery positive.
8. Connect the multimeter negative lead to the terminal at the other end of the cable.
9. Crank the engine and observe the voltage reading. The voltage reading should be 0.2 volt or lower. If the voltage drop is too high, clean the terminal ends. Retest, and if still high, install a new cable. If the voltage reading is less than 0.2 volt and the engine still cranks slowly, install a new starter motor.

Voltage Drop Test

WARNING When servicing the starter motor or performing other underhood work in the vicinity of the starter motor, be aware that the heavy gauge battery input lead at the starter solenoid is "electrically hot" at all times.

WARNING A protective cap or boot is provided over the battery input terminal on all vehicle lines and must be installed after servicing. Be sure to disconnect the battery ground cable before servicing the starter motor.
Always make the Rotunda 73 Digital Multimeter connections at the component terminal rather than at the wiring end connector. Making a connection at the wiring end connector could result in false readings because the meter will not pick up a high resistance between the wiring connector and the component.

How old is the battery? Is there any aftermarket alarms or stereos installed? And are the cables clean and tight? If the battery is new and the cables are tight you have a parasitic drain. you need a DMM, disconnect negative terminal and place one lead on cable, one on post. Set DMM to amps and compare reading to man. specs usually between 20 to 50 milliamps. If out of spec disconnect one fuse at a time looking for a fall in the reading and that will tell you what circuit has the issue

The green light on your charger indicates a full charge but you know thats not right since you didn't charge the batteries when they were in storage they have dropped so low the charger cannot detect them and provide a charge. The batteries will need to be replaced with new ones. Charge before use and charge for at least 20 days to get them operating at 100% now you will have to use it for those 20 days to get the batteries used to charging charge every night when you go to bed and unplug when you get up in the morning. If you do have to leave the chair for a week or so put up fully charged and charge once a week overnight. If you put the chair in storage again disconnect the batteries from the chair and store with a full charge. Hope this helps you

The light will stay on until about 20 starts. Once that 20th start is made, light should shut off. If not, it can be shut off by diagnostic scanner.