I'd like this question answered too. I'd like to tap into the lighting system as well to run some driving lights, etc. There are previous posts about turn signal faults being driven by incorrect software loads. So, no relays, but perhaps square waves generated by the computer module?...I imagine?... You may indeed be able to have the "square wave" drive a small relay that connects the proper 12v to the aftermarket LED. Would be nice to know the proper impedance to allow matching of the relay coil to the circuit. Not sure I would be connecting items without compatibility test and evaluation results from the vendor.