It could mean the alt is nearing the end or a loose connection of the alt wiring. TAkeit to auto zone and have the alt. checked
That is the charging system warning light. If it stays on or flickers it means the alternator is not outputting enough voltage to keep the battery charged. With a digital volt meter you should read from 13.5 to 15.5 volts at the battery with the engine running. If not the alternator or the voltage regulator is defective. The voltage regulator is more than likely built into the alternator.
Possible bad alternator.
If the battery light flickers, it's losing voltage. It would be worse when the lights and other accessories are running. It just may not be enough to kill it yet. I would suspect parts in this order. Alternator(if there is a voltage guage, should be around 13-14 volts) discharged battery
That is the charging system warning light. If it stays on or flickers it means the alternator is not outputting enough voltage to keep the battery charged. With a digital volt meter you should read from 13.5 to 15.5 volts at the battery with the engine running. If not the alternator or the voltage regulator is defective. The voltage regulator is more than likely built into the alternator.
what causes the battery light to on a 2005 ford expedition to come on?
Your battery is not being charged because of a problem with the charging system Whether its a problem with the alternator / voltage regulator , the serpentine belt etc . you should have the charging system checked
it takes 1 C type battery <><><> That answer is not really very helpful because the question doesn't say what the voltage of the light bulbs is! This question cannot be answered without knowing at least the voltage of the light bulbs and also the voltage of the battery that is being asked about.
The battery isn't being charged
It is possible you have a bad alternator, or a bad connection at the battery. You can take the car by your local auto parts store and have the altornator checked.
Probably the battery is discharged. It's possible the battery is not charging because the power adapter is dead. Check the power adapter with a voltmeter.
Sounds like battery/alternator problems. Check battery first, it's cheaper to replace.
Take it to auto zone and they will check out the alternator for free.