Quote Originally Posted by Rapidrory View Post
Have you cut the power line to the RX of one of the TZs; You should only ever have one BEC powering an RX, so ideally need to cut the positive wire to the RX from one of them. And the arcing is standard as the caps charge; most people will get this. If it's larger than normal than this is more likely to be a symptom of a problem than a cause.
Oh I understand why it arcs/sparks but it does damage the contacts and should be avoided.

I've tried having the RX powered by one Tz-85A and I've had it so all 3 Tz-85As power the RX, it doesn't seem to affect it. Either way it's only powered off the one at the moment.