2000 Toyota Tundra Battery Light On But Alternator Is Charging

1 Make sure the alternator is charging operating properly by measuring the voltage between earth battery negative and the live terminal.

2000 toyota tundra battery light on but alternator is charging. 2 Make sure the regulator is being excited. I am trying to find out why may battery light is on with out spending 10000 for diagnostic. If it is running and the alternator is charging then a diode inside the alternator is the likely culprit.

It should be greater than 13 volts less than 15V. This light illuminates whenever the charging system does not charge the battery with a voltage above approximately 135 volts. The throttle may be dirty enough to drop the idle 50-75-100 rpms below specifications for the alternator field.

When I went to go purchase a new one from. Since you pretty much ruled out the alternator I would make sure to check your fuses. 2000 Toyota Tundra SR5 4x4 with 47L V8.

My next adventure is to attempt testing the alternator. The battery is fine it has no trouble starting or holding a charge. If its the same with the truck off and running then the alternator isnt putting out anything would be my logic.

Next few are always leads to relay box alternator sense etc. It is turned by a serpentine belt. If starts charging theres broken wire or fuse in the charging circuit somewhere in the truck.

With the headlamps on and the HVAC blower turned to Hi position charging. 2000 Toyota Tundra. 4000 Refundable Core Deposit.