Yeah bad grounds will **** up your car and give you more headaches than you can imagine. Do yourself a favor and make yourself some new ones. I made new ones using Rockford Fosgate gold Ring Terminals and some 8AWG Monster Cable and I noticed my electronics run a little stronger (lights look brighter, etc...). Those old stock ones are really nasty and oxidized looking. The ones I made are water and weather proof plus the wire is copper unlike whatever that stock crap is.