I've been having some problems with my glow plug system for a few months now- It doesnt like the ambient temperatures around 50-70, and the glow plug light wont light up. usually after 30 seconds of cranking, the light would come up. Right now, im kinda stuck, seeing as how the truck wont start up without the glow. Before I totally kill the battery, I recalled t-rusty posting this: I installed a momentary push button so they can't accidentally be left on, and use the seat belt light as a 'timer'. It stays on roughly 8 seconds...which is fine with a cold engine down to 50 degrees or so. Much colder and I let em glow for another 2-5 seconds. You get a feel for it pretty quick. When the engine is even remotely warm I don't bother using the GP's. If you want to do the manual switch just find and trace the little blue wire to the controller at the back of the motor. Cut the little blue wire about 6" away from the controller and pull it back out of the harness. Pull the wire through the firewall somewhere and attach the blue wire to one side of your switch. Attach a ground wire to the other side of the switch. Now when the key is turned to the 'run' position if you push the button the GP's will come on (with the glow light) until you decide they're warm enough...and they won't cycle for the hell of it when the truck is warm. Ok, Right now its dark so i cant see squat. im assuming there is some blue wire somewhere, going back to the glow plug controller. Question is, how is 6" enough to pull back into the cab? Also is there any other way to Track the wire, other than being blue?