The battery is definitely tired. Should I replace both the alternator and battery?
The hum is probably the alternator on its way out and is not charging the battery but check ur belt and make sure not to loose if u drive to one of the local auto stores most of them [like advanced auto-auto zone ]can do a free test on both and advise if replacement or repair needed
SOURCE: Replaced the battery one week ago, car won't start
Might be strange but it sounds like the alternator might have died.
SOURCE: battery not keeping charge - replaced
best and easiest way to test the alternator is to take it to an auto parts store... they will test the battery and charging system for free so that they can try to sell you parts
Sears will charge like $30 but give you that money back towards the price of the repair
without a load tester there is not much you can do to test the charging system correctly
SOURCE: For weeks the car had to be jumped to start, I
You may check for corrosion on your battery terminals, if corrosion is present then disconnect the cables and clean the corrosion. If thats not the case then just check to make sure that your terminal is connected tightly to the battery post. I recently had this trouble on my brothers spyder and no matter how tight i got the terminal it still would move when i pulled on it so I just went to the parts store and bought a new terminal for $6.99 and had it running again in 10 minutes.
SOURCE: 2001 Mirage 1.8. Battery
Sounds like you have a bad ground for your brakes lights. I would start by checking the light terminals in the back for damage, corrosion, or even burn marks. If you do find some they those terminals need to be replaced. There will also be a ground wire with a nut or bolt in the area around the light make sure it is also clean and free of corrosion and verify it is tight.
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