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    Quote Originally Posted by tbplus10 View Post
    Pikey if you've got an owners manual look in it for a section on charging, I'm not sure when GM changed the system but newer trucks have a variable charging system that only produces the amount of volts the engine/charging system requires, thats what shows on the gauge. I'm not sure it was in use for 05 models but it could be. You cant test your alternator in the conventional way, you take a chance of damaging it doing this because it doesnt know what amperage it's supposed to be at.

    Alex your truck definately has this system, if they arent already turn you lights on auto setting and then watch the gauge next time your driving during the day and go through shadows dark enough to turn on the headlights, the gauge registers the amperage change almost instantly. Check your owners manual and it will explan the system much better than I can.
    Wow, great info, Thanks. I will check the manual. There is some weird box on the negative battery cable. I wonder if that box is for that new fancy charging system you speak of. I have not had a truck with that box before. Today I noticed that it drops to 12.3 on the freeway. Then after leaving the freeway it stays at the 12.3. I did try putting all of the windows up, turning my brights on, both blowers on high, and dvd player on, the voltage went up when I did this on the freeway. If I shut it off and restart it, then it goes back up to 14 and stays there until I get on the freeway again.
    Last edited by Pikey; 08-02-2012 at 10:44 AM.

    1995 Silverado 4x4
    6" BDS Suspension Lift-3" Body Lift-Add A Leaf in rear -Trailmaster SSV Shocks-Duel Steering Stabilizer Kit -AirAid Cold air intake-
    4.56 Gears with Detroit Auburn Locker-Pro-Comp Traction Bars with duel shocks-Aluminum Skid Plate Kit-38.5" x 16.5" Mickey Thompson Baja Claws-Constant Dropping fuel gauge

    2005 Yukon XL Jet Power Programmer, Bilstein Shocks, Bilstein rear springs, Helwig Anti-sway bars, EGR Window Visors, EGR Hood Shield, Denali Headlights, Headlight harness upgrade, GE NightHawk Bulbs, White Night Rear lighting system, Russell Braided SS brake lines, PowerStop Brake pads, PowerStop cross drilled and Slotted Rotors, http://www.gmtruckclub.com/forum/sho...5-GMC-Yukon-XL
    2002 Silverado ext cab 2wd (Sold)
    2003 Yukon XL (Totaled)

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