Well, I've had conflicting advice from various sources. Full in-line ground loop suppression devices/ferrite rings/nowt... Maybe I'm trusting the one with the outcome I want
Having said that the guy who told me this is the guy who supplied the harness, I've met and ridden with him and he does know a bit about sparky stuff and comms. Although he has an Autocom/Kenwood PMR set-up with the radio powered though the Autocom. Time will tell I guess, I'll let you know next week once I've gotten around to fitting the parts onto the bike and testing them. As you say it may also be dependant on the bike and where you're hooked up to power-wise. Mines a VFR VTEC with power taken from the rear brake light + feed.