just bought a 2005 equinox from family friend. has 125k. car wouldn't start when purchased. replaced starter and all was fine. recently did oil change, thermostat, front pads and rotors. This morning i go to start the car and the service engine soon light was on, not oil reminder, not mil. But the SES light. Then later in the day the security light comes on and i have no gauges. Reset battery and gauges come back. still have lights on. now i noticed that my eng main relay clicks and my throttle body opens by itself with engine off???????????????? i am so confused. i am pretty good with cars but this one has me scratching my head. any help would be appreciated. looking forward to being a member of this forum.