I'm working on installing an amateur radio (Yaesu FT-857D) in my 2017 Volt. I was planning on connecting the power for the radio to the screw terminals, which is fine, but I noticed what appears to be an unused connection coming off the battery. Does anyone know what type of connectors the blue, brown and purple connectors are? They appear to be some kind of quick disconnect terminals. It might be nicer to attach to that unused "gray" one, if I can buy whatever connector that is.