2002 Dodge Ram headlights/talilights???

I just removed and cleaned the negative battery cable as it was corroded. After I hooked it back up, the head lights come on when ever the key is on or it's running. They never did this before. Also, I can't switch to high beams, the high beam indicator on the dash works but the lights don't change. I have tail lights but the turn signals and brake lights don't work. This next one is a minor thing but the temp/direction overhead console works like it used to except the temperature shows two dashes and no numbers. HELP!!!!