Yes only one wire that goes directly to the battery. On my car it goes to a remote battery connection. "Positive bulk head bought at Deka Battery". My battery is in the trunk an the bulk head is the connection for positive battery under the hood. The first picture the black wire is the only wire needed for alternator. The second picture you can see a solenoid wired in to shut the alternator off. I had to do this because I kept throwing the belt over 8000 RPM's