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Thread: Stud #1 - Stud #2 Fuse Box Question

  1. #1
    Join Date
    Jan 2002
    Location
    La Selva Beach, California
    Posts
    678

    Post

    What is the difference between the Stud #1 and Stud #2
    locations in the fuse/relay block? Do they work independently
    or is there some commonality between them.

    Stud #1 Accessory Power/Trailer Wiring Feed..............takes a 40 amp fuse
    Stud #2 Accessory Power/Trailer Wiring Brake Feed....takes a 30 amp fuse

    I put the 30 amp fuse in Stud #2 when I had the Lance camper harness installed.
    Now I just purchased an electric brake controller to install for our new
    trailer and I will need to put the 40 amp fuse in Stud #1 to make it work.

    What do each of them do?
    Can one of our electrical guru's simplify this for us........I'm confused

    Thanks
    02 Chevy 3500HD, D/A, 4x4, Lucerix Mirrors, Fumoto valve, Amsoil air filter, <br />Kaydenco mudflaps, Hadley Air Horns, Lund Hood Protector, Prodigy,<br />2 micron Racor Post OEM fuel filter install photos:<br /><a href=\"http://community.webshots.com/album/66562661oghYok\" target=\"_blank\">http://community.webshots.com/album/66562661oghYok</a>

  2. #2
    Join Date
    Nov 2002
    Location
    Tulsa
    Posts
    74

    Question

    I believe it's something like this:

    Stud #1 charges your camper battery.

    Stud #2 powers electric trailer brakes.
    2003 Sierra 2500HD SLE EC 2WD Short Box D/A

  3. #3
    Join Date
    Jan 2002
    Location
    La Selva Beach, California
    Posts
    678

    Post

    NoMo,

    I think you have it reversed????
    02 Chevy 3500HD, D/A, 4x4, Lucerix Mirrors, Fumoto valve, Amsoil air filter, <br />Kaydenco mudflaps, Hadley Air Horns, Lund Hood Protector, Prodigy,<br />2 micron Racor Post OEM fuel filter install photos:<br /><a href=\"http://community.webshots.com/album/66562661oghYok\" target=\"_blank\">http://community.webshots.com/album/66562661oghYok</a>

  4. #4
    Join Date
    Jul 2000
    Location
    Washington
    Posts
    145

    Post

    56Nomad,

    I think NoMo is correct, at least on my 2003 3500 he is correct.
    The data you posted suggests that also...

    "Stud #1 Accessory Power/Trailer Wiring Feed..............takes a 40 amp fuse"
    "Stud #2 Accessory Power/Trailer Wiring Brake Feed....takes a 30 amp fuse"

    Don
    2003 GMC 3500 SLE, D/A, EC, LB, 2WD, White/Pewter, DeeZee boards, 5th wheel

  5. #5
    Join Date
    Jul 2001
    Location
    Aurora, CO
    Posts
    118

    Cool

    NoMo and Don are correct.

    The 40amp fuse that is located in Stud #1 powers your 12 volt constant. When you have a fuse in there, it sends 12 volts to your plug by the receiver and in the bed (if you have that option)

    The 30amp fuse located in Stud #2 is what powers the brake controller harness for your brake controller to work.

    This is the case for the 03's.

    Bob
    2003 GMC 2500HD 4x4 CC SLT D/A, fully loaded!!<br />Upgrade\'s so far:<br />265x75 R16 Pathfinder ATR\'s, Westin CPS Nerf Bars, GM Mud Flaps, 3M Clear Bra, Line-X, Reese 20K Hitch, Prodigy Controller<p><a href=\"http://www.webphotos.com/list_photos.asp?mi=3&smi=1&a=97210\" target=\"_blank\"> My Truck</a><br /><a href=\"http://www.webphotos.com/list_photos.asp?mi=3&smi=1&a=93738\" target=\"_blank\">Our Fifth Wheel</a>

  6. #6
    Join Date
    Jan 2002
    Location
    La Selva Beach, California
    Posts
    678

    Post

    Thanks for that info.....

    This must be the reason that the 2003's were a little
    more expensive than the 2002's

    I wonder why they would switch the positions on
    Stud #1 and Stud #2
    02 Chevy 3500HD, D/A, 4x4, Lucerix Mirrors, Fumoto valve, Amsoil air filter, <br />Kaydenco mudflaps, Hadley Air Horns, Lund Hood Protector, Prodigy,<br />2 micron Racor Post OEM fuel filter install photos:<br /><a href=\"http://community.webshots.com/album/66562661oghYok\" target=\"_blank\">http://community.webshots.com/album/66562661oghYok</a>

  7. #7
    Join Date
    Nov 2000
    Location
    Oklahoma City,Ok,USA
    Posts
    141

    Post

    Same reason the switched the *#&%$ Trailer controller connection
    82 6.2 1/2 ton Energizer Version 359,000 Miles and Counting!
    99 GMC 2500LD 6.0 That wants to be a D-Max when it grows up!

  8. #8
    Join Date
    Nov 2002
    Location
    Tulsa
    Posts
    74

    Smile

    I was just going off the descriptions you gave for each fuse position. I haven't checked for myself to see which one powers the battery and the brakes. [img]smile.gif[/img]
    2003 Sierra 2500HD SLE EC 2WD Short Box D/A

  9. #9
    Join Date
    Jun 2002
    Location
    Albuquerque, NM
    Posts
    105

    Post

    The puzzle for me, and this was with both my '01 and '03 is that the truck comes with the fuse already installed for the brake controller. I know of at least one person (who shall remain anonymous [img]smile.gif[/img] ) that blew the fuse while mucking around wiring up his brake controller. He thought the fuse included with the wiring harness was to provide power to the brake circuit. NOPE, that fuse goes into STUD 1 position (both '01 and '03) and provides +12 volt power to the trailer connector. ALL trucks ordered with the trailering option do not come with the B+ fuse installed.

    Weird???
    2003 Silverado 2500HD EC SB 4x4 D/A, Jordan 2020 Brake Controller,<br />Transfer Flow 45 Gal., Reese 16k FW hitch, 2001 Sunnybrook 27RKFS FW

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