I read all the post but a test light Is not the tool of choice to check for a draw at battery you use a amp. meter. set meter on Miliamps disconnect one battery lead connect one lead to battery post other to cable make sure key is off check for draw on newer trucks with computers you will see hi current draw for a few minutes until computer goes onto sleep mode than draw will come down the rule of thumb any draw over approx 50 miliamps is to hi l believe that this truck should have approx 13 Milamps in sleep mode.