This is a really basic question, but do I need to disconnect my battery before crimping on a new wiring harness for my side marker light?

I got into a fender bender that did some pretty bad damage to the front of my car, including knocking off part of the bumper and side marker. I can't pass my brake and light inspection without fixing the orange side marker on the driver's side bumper (not the one behind the wheel), which fell off ...

I had my rotors and pads replaced a few months ago and just recently heard a metal scratching noise coming from my front driver's side tire. I took both front wheels off and saw that the caliper spring was missing from the front passenger's side. There weren't any scratches inside the tire so I ...