If it is humming ONLY when you connect it for charging and does not hum when you have no load on it...it has too much initial load and the humming is caused by an output current overload.
I don't know what you are trying to charge....if you are VERY careful and you can monitor the output current load....you may be able to get a charge....BUT BE VERY CAREFUL!
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How old is the battery? Batteries do ware out. Have you had it tested? You can get it tested at most Sears Auto stores for free. If you can take it out of the vehicle and take it to Sears, then you could save yourself some time and money. I am assuming that your battery charger is working correctly. Do you have it hooked up to the right terminals? When the unit is plugged in, does it make a low level humming noise (indicating that it is working)? Does a value register on the gauge?
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
first of all check for at least 12 volts from the battery and the charger, you can test this using a multimeter, if the battery doesn't show any volts, lift up one side of the blue plastic housing on the top and verify that both the positive and negative wires are plugged in, you can order a new one here www.powerwheelsoutlet.com
If it is out of warranty open it up and check the fuse inside. This has happened to me several times with several brands, and it has always been the fuse. They are usually replaceable at Radio Shack or the Auto Parts Store.