Ok, I need a little help here. There is a red wire with a blue connector next to my starter solonoid that is disconnected. I have looked at the wiring diagram but still don't understand what purpose it serves. Also there are only two wires going to my alt. Since I puchased the car the dash charge gauge has never worked. Today I started the car and used my test light to connect the red wire but the charge gauge never moved? The alt is charging 12.9 volts ( I have test equipment). Any ideas what this wire is for and why my gauge is not working.