Sorry fo rthe delay on responding but I've been away. I don't know why you'd need to use a diode in your set-up unless somehow you will be sharing power sources. Did you want to wire the halos to work as 3 pairs?
The 300SRT rims - do you know if they are awd? I am having difficulty installing them. Members say to use 3mm hubcentric spacer. Can you provide insight.