Before purchasing this harness, please confirm the matching model. Try to avoid cars that are too old to avoid short circuits. The red of this harness is the positive pole, and the black is the negative pole. The product comes with installation instructions, please strictly follow the installation instructions for installation. If you have any questions about the product, you can contact us directly.Universal fitting: Compatible with almost made electric start upright engine 49cc 50cc 70cc 80cc 90cc 100cc 110cc 125cc engines. For ATV, Coolster, Quad Bike, Dirt Bike, Pit Bike, Go Kart, Kawasaki KLX, 4 Wheelers, Scooter, Buggy, Motowork, Dune, .Compatible with many brands,such as: Atomik, Pitpro, Hummer, Orion, Xmoto, Lei, DMX, SWD, TDR, DDR, Tommahawk, Monsoon, Grudge, Kazuma, Bull, Trooper, Hunter, Motox, Trojan, Blitz, Crusade, Link, Bigfoot, Kuda, Motoworks, Nitrous, Reign, Fury, Prox, Raider, Zongshen, Loncin, Ducar, Lifan, Thumpster, Thumbstar, Chongqing.This is a complete electric