I have made a harness which is without relay and used it with ms-8.
I have an issue of audible popping sound when HU / car is turned on.
I was praising Technic's harness on other thread as I thought it would also help to avoid popping sound.
Waiting to see results of your experiment.
RETROFITS: LCI Conversion - LCI Xenons - LCI Tail lights - Memory heated seats -
Folding mirrors with auto-dip - Rear PDC - CIC with DAB Plus - Combox - 6FL - 6NF
- 6NR - BMW live & Internet
MODS: Eibach Sportsline - AluFelgens CS7 - JBL MS-8 - Gladen components - SWS-8