1975 Chevrolet K5 Blazer 5.7L V8 4BL. When I turned the key to start the truck(CLICK) that's all it does each time I turn the key (CLICK) just once, it doesn't turn over, no other sounds just 1 click every time I turn key to try and start it up. everything else works all power works the battery is good lights work they are not dim. the only thing that occurs is click!