There are two wiring harnesses on carts with factory installed accessories.
The Acessory wiring harness is the same on sepex and series carts, the the control harness is different.
https://shop.ezgo.com/products/Acces...-Medalist.html
https://shop.ezgo.com/products/Contr...roduct_id=3616
The above links will at least give you the part numbers to look for.
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FWIW: Here is the DCS control harness vagabond is probably talking about. Price has gone up.
https://shop.ezgo.com/products/DCS-C...ness-Only.html