Reply To: Gv125s harness is missing an ecu connection
Yes you can only use a twin plug ecu on a twin harness.
It is a very messy job to mix and match and may fry it altogether
The single plug is just the prototype ecu hyosung used on early batches. So you have a 2017/2018 chassis (no matter if it says 22 plate). ECU supplied on the bike determined its real year.
Twin plug ecu is better. Hyosung isnt making single plugs anymore.
Regards