Make sure the battery cable connectors are clean and tight, bad connections can keep the alternator from charging the battery. also be sure that the belt tensionor is set right if it is bad replace it. You may have an electrical problem, Check all your fuses. If you have a short or an "open" wire touching the body or any other metal area it could slowly drain your battery as well. Had a similar problem(s)...and these were the two answers. a) The trunk light has a mercury switch and when it malfunctions, the light stays on, in the morning the battery would be dead. The switch is attached to the trunk lid opening cables (looks like a black cylinder. It may need to be repositioned ( so the light turns off )or replaced if malfunctioning. b) You may have to take your vehicle out on the highway for an hour in order to give the battery a good charge. City driving does not cut it.
test the voltage on the battery first, then on the alternator. If its good then it could just be the diode in the alternator. I would suggest you replace it becuase eventually your alternator will die and the battery will not get charged leaving you stranded somewhere. It is possible to just be a battery but you wont know unless you have the battery tested. check the voltage on the battery and the alternator before you do anything else.
I would say probably not, the reason your battery is weak is I reckon due to a fault with your alternator. It is obviously not producing sufficient power (electricity ) to keep the battery charged. The whining noise is probably caused by worn-out bearings. A replacement or re-conditioned alternator should cure the problem .
battery light on 2000 f250 will blink if battery is not properly charged. an example is if you have been sitting all day with stereo olaying and engine not running, you have run battery down some. after starting engine and driving, the battery light will blink while alternator charges until battery is fully charged i have only experienced this at night when lights are on creating extra load for alternator ,after running battery down with stereo all day
Battery light usually means alternator not charging. Most common solutions would be be a bad alternator, bad connection, or loose alternator belt. If the battery and alt test ok than check the connections to the alternator and battery. You may also have a battery drain (something that is staying on and killing the battery)
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