The first half of your story sounds like a connector was bypassed in the smaller battery positive wire. Being a mechanical connection, it is prone to corrosion and arcing. It is perfectly fine to bypass that and leave it that way.
The second part of your description sounds unrelated to the two-year-old problem, but it doesn't make sense.
"when I try to crank the car it gets power but when I turn the key nothing"
"Nothing" is not helpful. You turn the ignition switch to crank the engine, and when you turn the ignition switch, "it" gets power, but you get "nothing". Do see my confusion? Please give me specific symptoms and observations.
What happens to the brightness of the interior lights when you try to crank the engine? Do you hear any noises at all from under the hood, like a faint single click each time you turn the ignition switch to "crank"? How about a rather loud clunk? Do the dash lights turn on like normal?
Flickering head lights is usually caused by a defective head light switch, but there are other potential causes.
Monday, September 21st, 2015 AT 9:40 PM