I will take a stab at it.
question #1. first is the car stick or auto? my guess would be that the emergency brake is grabbing even though you have it off. I would pull off the rotors and inspect/lube/adjust to make sure when it is disengaged that is not grabbing.
question #2. wire connection is broken you will have to do a 12v test at connection and trace.
'You don't buy all that jewellery and stick it on an ugly person.'