I have owned this blazer for 1 month and I have replaced the motor the radiator which is why I had to replace the motor, all brakes rotors calipers ignition module and starter relay now the dash and headlights flicker on and off mostly with acceleration but sometimes intermitly the radio stays on the truck doesn't shut off just the lights. I have had the altenator tested and they said it was good.. sometimes the truck don't want to start and I take out the starter rely and put it back in then it will start I am going crazy with this truck can anyone help me figure this out..

 

UPDATE!! I think I found my problem... I guess it was a wire going to the temp sensor the wire was laying on the valve cover and shorting out I moved the wire not only dis the lights stop flickering the truck has more power... Go figure