I hacked together a harness for a friend when doing a Mini D2S 3.0 retrofit on his Honda Element and had so many issues with the stock wiring. I even fried an eBay harness on the first lights-on test, so I just got a MotoControl from TRS and all was good. You could probably return your single beam harness and exchange it for the MotoControl, just ask TRS to do the return for you - they're awesome like that.