The Positive Side of any Alternator or Generator is ALWAYS the sole, Isolated, Insulated Power Connector Wire
(usually colored Red or Orange) attached with an eyelet end via a Fastener threaded onto a Copper Pole for (+) Voltage into the Alternator. There may also be a Secondary Voltage Regulator Signal Wire that will be smaller and is also Red in color... or there will be a 2-3 Wire Connector mating the Alternator Rectifier Circuit to that of the SUV Engine Harness Connector.
The Ground side of this Circuit always the Metal Case or Frame of the Alternator itself... hopefully bolted solidly to the Engine Block. The Negative (-) side of the Battery meets up with the Engine Block via the Heavy Black Grounding Cable bolted solidly along its flank.
All parts of the SUV Body and Frame of the vehicle are likewise behaving as a Common Ground and usually get electrically "Bonded" together; either by Welding or by fastened Braided Copper Wire "Bonding Straps" wherever needed to assure that this remains the case.
For more precise vehicle specific electrical information, download a Service Manual unique to your Year-Make & Model SUV from any Post showing @Mooseman's Signature Line showing the Links and refer to all Electrical Diagrams in the appropriate chapters.