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Message: [QUOTE="Cody, post: 171103, member: 68"] I read about this mod along time ago but today jogged my mind of it as I was letting my truck warm up after work and I watched one of my coworkers try and start his new to him 7.3 as soon as he hopped in with no luck after about 30 seconds of cranking.. waited 5 seconds and tried again :morons: After watching him do this 2 or 3 times i felt bad enough for his starter so i walked over and asked if he needed a hand. He told me his "glow plugs must be junk." I told him to try and start it again for the heck of it. His "Wait to Start Light" stayed on for about 7 seconds, went off, and he proceeded to crank. We then had a lengthy conversation on how the WTS light was simply an idiot light and the GPs could stay active for up to 2 minutes. I had him cycle the key count to 15 and try again, magically his truck fired. He asked me how he was supposed to know when the GP cycle was over, Suddenly the relay light popped into my head. I told him it would cost him a sausage egg mcmuffin from Mcdonalds and about 12 dollars. (for both of us of course) After we went to McDonalds we went to the local auto parts store to buy our supplies and get started. [ATTACH=full]73018[/ATTACH] What you will need: 1.10-15ft 12-14g wire 2. 2 sealed eyelet connections 3. 2 butt connectors 4. A 12v led light (many different options) 5. Drill and bit for led (5/16" for the one i got) 6. Wire strippers/crimpers 7. 10mm Socket with Wrench Once we got back to the shop I had him pop his hood and located the GPR (farthest one back passenger side of the motor) after a quick "google" and a second with the test light to make sure i figured out what each post does on the GPR [ATTACH=full]73019[/ATTACH] I than ran a wire from the "pink" post which is the output to the glow plugs to the cab where i wanted to mount the LED. You will need a 10mm socket to get the nut loose and an eyelet connection [ATTACH=full]73020[/ATTACH] I chose the a pillar for both his truck and mine as we have gauge pods. I simply fallowed the boost line with a few loose zip ties. [ATTACH=full]73021[/ATTACH] I then drilled a 5/16" hole in the pod, connected the wire off the GPR to the positive side of the LED and ran a ground right behind the a pillar on a bolt, pushed the LED in place, threw the gauge pod back up and tested it. [ATTACH=full]73022[/ATTACH] With the truck sitting for about a half hour his WTS light went off in 5-10 seconds but his relay stayed on for nearly 50 seconds. This is a very easy Mod, i did both of our trucks in about an hour and 15 minutes including getting breakfast, parts, driving out to the shop from town, taking pictures while doing my truck and cleaning up... if you have any questions feel free to pm me Hopefully this will help with cold start issues and trying to diagnose the gp system [/QUOTE]