Hey fellows. I need to find out which relay is the glow plug relay. Their is 2 relays up around the fuel filter to the left facing the truck on my 2001 F-250 powerstroke. Which one is that relay. The one in front higher up or the one behind it lower. Can yall explain the troubleshooting of that relay. I think I trouble shot it right but dont really know for sure. Having a hard time cranking. It will crank and fire but not like it used to. Longer cranking than it used to. thanks for any info. cuttr28