When hooking up new battery, something starts humming when i hook up the second post

SOURCE: Battery Posts

If you're talking about the posts on the battery itself, I'm pretty sure your only option is to get a new battery. You could try using some material to complete the connection, but I would have to reccomend against that in the strongest language possible.

SOURCE: My 1994 4Runner will not start. Was fine two days

If the truck is just making a heavy clicking noise then you likely need a set of solenoid contacts put in the starter solenoid switch.Remove the starter and then you will see three 8mm bolts holding the cover down on the top of the solenoid portion of the starter.Remove these and then pull the plunger out of the solenoid[careful of the spring].You will see that the copper contacts are no longer the same thickness,if this is the case replace them.You should be able to buy these at a starter repair shop or the dealer,one goes in easily the other is pressed together but you can remove it by setting it on a 14mm wrench and then set the wrench on a socket and hit the post [with the nut put back on it]with a hammer.Separate the post from the contact and then put the new contact on it and set the post into the square end of an upright deep 3/8 socket and hammer it in place with a large punch.Assemble the solenoid,put on the truck and you will be good to go.

SOURCE: Can I hook a battery

If you have jump start posts on your battery you can use them ok.Just make sure you put black(neg)(-) to the Neg post on the car and the red(pos)(+) to the postive post.Depending on how low your battery is you may want to just let your car sit and reve the engine up on the good car for a few minutes to make sure you get enough voltage into the bad battery before you try and start it.