I have a b20 engine in my 94 civic hatchback, most of my wiring is mangled from the previous owners and from sitting in a field, it’s a miracle that it has worked as is, but it is starting to have problems. Power isn’t being delivered to the main relay so in turn my fuel pump isn’t turning on. I’m wanting to replace the harness so I can start fresh but I’m not quite sure what harness I need and what I already have if it’s some kind of adapter or something because I thought b20s are obd2 engines. It has a Hondata s300 chipped p28 ecu. Any help would be appreciated.