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Message: [QUOTE="cowboy_dan, post: 130141, member: 258"] Keep in mind that idle speed will also affect the voltage. I have a program that idles less than a hundred RPM faster than the others. Can't hear the difference, and can't tell the difference on the tach, but the voltage is slightly higher in that tune than the others. Between the HO alternator and a tad faster idle, that could be what is letting the voltage come up high enough to cause this. So you might want to stick AE on it and see where it is idling, then call your tuner and see if 1) that is the correct idle speed, and 2) can they lower the idle or raise the kick-off voltage. You might want to see if you can adjust the regulator down a touch, though. If the glow plugs get too hot, you could damage them. Higher system voltage for same resistance = higher current = hotter plugs. How much current does that take? I dunno. Figure EGTs can be sustained in the 1000-1200 deg range, and I haven't seen anybody claim that is bad for the glow plugs. Then again, the temp is the cylinder is cyclic with the (relatively) cool intake air coming in, then the compression and power strokes creating heat, then the exhaust stroke relieving some of that heat. So maybe the GP tips don't get as hot with the engine running and pulling hard as they do sitting there preheating on a cold morning. It would be an interesting heat transfer study. Looking at the attached chart, I'd say that 1000-1200 deg is about the standard temp for a glow plug. [/QUOTE]

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