My truck wont start and when I turn the key off from trying to start it, I keep hearing a clicking sound, and had to take a battery cable off to make it stop. Is that a bad connection or is something else wrong. It did start one time while I was fooling around with the cables and fuses. I'm not sure what caused it to start the one time but I shut it off and tried to start again immediately and it wouldn't start and done the clicking again.