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Message: [QUOTE="justinlogue5_0, post: 1569193, member: 7635"] I think you may me on to something about the extra draw while glow plugs are on. Here is an update, checked head light wiring and there is a relay of sorts for the headlight "kit". The relay is grounded to the body ground and the power wire goes straight to the DS battery and the wiring splits off and goes over to the PS headlight ballast. Then as described the factory headlight pig tail plugs into the ballast and then from there to the bulb. So it looks like the head light pigtail is the trigger wire turning on the relay to the ballast and then the ballast feeds the head light bulb. New headlight switch came in day early BUT was wrong one so back to waiting on the correct one but I don't think that is the issue since I was able to see this when I cranked it this morning, which was I left the lights off and cranked the truck "11.7v" and holding. Once the dome light got brighter and I started to see the Volts climb I knew the glow plugs were done so I flipped on the head lights and the motor never missed a beat! Couple days ago I got in the truck (weather was in the low 70's so not hot) drove about 5 mins up the road and shut it off for about 15 mins to run an errand. Cranked the truck turned on the lights and as expected it killed the truck BUT if the oil wasn't warm enough the glow plugs might have been on still and I didn't realize that was what was going on, I will have to watch this closer now. Remind me again, don't the glow plugs keep working until the truck sees 130* (+/-) oil temp then the truck doesn't turn on the glow plugs anymore? If this is the case I just learned something new! I knew if the batteries were weak and the motor could turn at least 500 to 600 rpms the truck would never crank but I didn't know the low power would straight up kill the truck. Anyways I will pay closer attention to the volts as I turn on the lights. I like how bright they are but I may change them out. This could be annoying at times. [/QUOTE]