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stand alone voltage control and big 3 upgrade?

Discussion in 'GM Electrical Tech' started by Pikey, Feb 1, 2013.

  1. Pikey

    Pikey Moderator Staff Member 1000 Posts

    I have a 2005 yukon xl and am looking at doing a big 3 upgrade. My question is, there is a box on the negative battery cable of my truck. if I do the big 3, do I need to run the grounds thru this device? I think it is for the Stand alone Voltage Control, that is designed to adjust alternator output as needed and keep the battery charged at 80%. Will running the grounds away from this effect my truck's charging system?
    Last edited: Feb 1, 2013
  2. Jamm3r

    Jamm3r New Member

    A photo might help. Usually there's a red plastic plastic splice box in the positive cable where the cables for the alternator, starter, and battery come together.
  3. Pikey

    Pikey Moderator Staff Member 1000 Posts

    Here it is. On the other side it has GMSAVC written on it along with a part number. From the little research that I have done, it does not look like a good idea to go around it. As you can see there is not much room in the clamp for another wire. Maybe I will just clean the grounds for the battery. Then, install new grounds for the engine to frame and cab to frame. I just noticed in the pic how you can see the salt from the roads creeping from the wheel wells. Looks like it will be time for another engine detail soon!

    IMG_0695.jpg
  4. Pikey

    Pikey Moderator Staff Member 1000 Posts

    anyone have any ideas?
  5. Conlan Rose

    Conlan Rose Super Moderator 1000 Posts

    [MENTION=50075]SurrealOne[/MENTION] might know, his truck is just a year older than yours and he did a major electrical upgrade.
  6. Pikey

    Pikey Moderator Staff Member 1000 Posts

    The 2004 trucks that I looked at did not have it. Maybe his did. Guess we will find out
  7. SurrealOne

    SurrealOne Former Member 1000 Posts

    No box on my negative connection -- just the standard red plastic box on the positive connection.
  8. Toymyster

    Toymyster New Member

    That box does not connect to ground. It is only clamped to the ground cable. GM calls that box the Generator Battery Control Module. From what I gathered, it acts as a voltage regulator. If you are just looking for a ground, anywhere on your engine or chassis will do.
  9. Enkeiavalanche

    Enkeiavalanche Moderator 1000 Posts

    What are you doing that you need the Big 3?
  10. Pikey

    Pikey Moderator Staff Member 1000 Posts

    I never said that it was connected to ground. My post clearly states that it is clamped around the wire. I am concerned that if I run the big three and basically bypass the module then I am not going to have the correct alternator output.

    - - - Updated - - -

    I want to do it because I have some future mods in mind. I also get some severe dimming of lights when I roll the windows up. The battery and alternator are brand new.

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