Coalfire wrote:Yeah the actuator, looks like a starter relay. behind the fuel filter, under the little plastic powerstroke cover. Your valve cover gaskets could be bad, they house the wires for the glow plugs. If you could find someone with an amp clamp, you could check how much the plugs are drawing, or ohm check the plugs that will tell you if one is open.
It can be other things - glow plug controller, valve cover gasket connections/under valve cover wiring or the relay, or the switch or a bad wire, or weak batteries. A weak battery(s) will not be readily apparent, it will turn the truck over fine, usually a bit slow, but still fire and run - untill it gets cold. Typically it's either the relay (1st thing to throw a part at) and if not then a battery or under valve cover wiring - esp. on high milage vehicle. I'm not sure about the pre-1999 powerstrokes, but on the later ones, pulling the valve cover to replace harnesses, glow plugs, or the gasket itself is a very easy straightforward process - if that's the problem.http://www.rockauto.com/catalog/raframecatalog.php?ck