Kinda strange setup....I've got a 4g wiring harness rewired for obd1 (5g p28 ecu), but I have an obd2 alternator. I know just the plugs are different..so I'll just have to solder the obd2 plug on the 4g harness. I dont think the obd1 conversion has any bearing on the wiring since i didnt have to change any alternator stuff when i did the obd1 conversion. Does anyone know the color matchup for going from a 4g harness to obd2 plug? All the colors and functions match except 1 wire...which is C (charging system light i believe)...which is strange because on the obd0 schematic L looks to be the light.... Who's done it? Thanks.