Battery Red Light
#1
Battery Red Light
My battery light on 2003 Discovery recently has been coming when I start up engine. However, it usually turns off after I rev up the engine to about 3500 rpm's.
So the light goes away as soon as I drive.
I took her to AZ (Autozone) to check the battery and the alternator and both are good. Or at least that is what they said.
Any Ideas...?
So the light goes away as soon as I drive.
I took her to AZ (Autozone) to check the battery and the alternator and both are good. Or at least that is what they said.
Any Ideas...?
#2
Do you live in a cold environment, and how old is the battery?
I'm asking because I had a battery with a bad cell that tested fine when warm, but had low voltage when cold, around 0 deg. Celsius.
With the alternator running, even at idle unless the battery was really depleted, voltage should be around 14 volts. With a full charge, without the engine running, and with the battery unhooked, it should read at least 13 volts. A bad battery's voltage will drop significantly as soon as a load is applied, even a small load like the AC fan.
In cold climates like here, a car battery is expected to last around four years.
Also smart chargers are relatively inexpensive nowadays, and they have nice features such as desulfating and testing.
I'm asking because I had a battery with a bad cell that tested fine when warm, but had low voltage when cold, around 0 deg. Celsius.
With the alternator running, even at idle unless the battery was really depleted, voltage should be around 14 volts. With a full charge, without the engine running, and with the battery unhooked, it should read at least 13 volts. A bad battery's voltage will drop significantly as soon as a load is applied, even a small load like the AC fan.
In cold climates like here, a car battery is expected to last around four years.
Also smart chargers are relatively inexpensive nowadays, and they have nice features such as desulfating and testing.
#4
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