I didn't know that, as would never use a weber ecu myself, but of course if they do as you say(have a diode) they will as you say need to be correct.
These feed the pulsed earth from ecu pin 34, I think, must admit I have never seen one with a diode symbol, not that I use one anyway, mine perfect without it.
Good point out there, thanks, might have saved him some damage, sorry about that.
tabetha