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  1. #1
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    Battery Lug Size

    Just took possession of a 2021 Reflection 31 MB and getting ready to install a true battery shut off switch. Need to confirm the lug size on the positive cable, and the rig is elsewhere. Can anyone confirm proper lug size for positive cable? 5/16? 3/8? Also, that the cables are 6 gauge? Thanks you will save me a trip!

  2. #2
    Site Team Second Chance's Avatar
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    Most automotive/marine/RV battery terminal bolts are 5/16". Cable gauge depends on the length of the run and the amp-hour rating of the system. I checked the GD parts lookup site for your rig and that cable isn't listed. You could give GD Customer Service a call tomorrow with your VIN.

    Rob
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    2012 F350 DRW CC LB Lariat PS 6.7
    2020 Solitude 310GK-R, MORryde IS, disc brakes,
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    (Previously in a Reflection 337RLS)
    Full time since 08/2015

  3. #3
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    Cool, thanks. Thanks kind of what I thought. Alll I need for now. Much appreciated.
    2021 Reflection 31 MB
    2021 Ford F-250 6.7 Turbo Diesel
    B & W Companion Slider

  4. #4
    Big Traveler Wicked ace's Avatar
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    The two deep cycle lead acid batteries I have 1/4" threaded and automotive cable posts. I got some 1/4" SS wing nuts awhile back I use to affix the cable lugs.
    2018 F150 XLT 301a, Screw, 4x4, HDPP, Max tow, Andersen Ultimate w/ Curt Double Lock hitch.
    2019 Grand Design Reflection 150 series 260RD.

  5. #5
    Site Sponsor Jerryr's Avatar
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    Quote Originally Posted by ckramer1000 View Post
    Just took possession of a 2021 Reflection 31 MB and getting ready to install a true battery shut off switch. Need to confirm the lug size on the positive cable, and the rig is elsewhere. Can anyone confirm proper lug size for positive cable? 5/16? 3/8? Also, that the cables are 6 gauge? Thanks you will save me a trip!
    These are the cables I bought and the marine shut off switch I bought and installed on my 2017 Reflection 337RLS. 4AWG wires and the switch has Stud Size: 3/8" - 16.
    https://www.amazon.com/gp/product/B07BXXNMBJ/

    https://www.amazon.com/gp/product/B000MMC914/

    There are less expensive shut oof switches but this one is a highly rated beast.
    Last edited by Jerryr; 02-24-2021 at 04:29 PM.
    Jerry & Linda
    With Cleopatra our Jack Russell & and JR our Amazon Parrot
    2017 Reflection 337RLS, Build Date 01/2017, Titan Disk Brakes, Goodyear G614s 235/85/16 G Rated tires
    2020 F-350 Lariat Ultimate 4x4 PSD SRW Short Bed, 3483 lb Payload, Factory 5th Wheel Prep, Bedrug Bedliner, Andersen Ultimate II Aluminum 5th wheel hitch
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  6. #6
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    You can always buy 5/16 lugs and when you need a 3/8 lug. Just drill out the lug hole with a 3/8 drill bit.

    Gary
    2019 Ford F350 Dually
    2020 GD Solitude 375RES-R

  7. #7
    Seasoned Camper huntindog's Avatar
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    Quote Originally Posted by FOWLERGK View Post
    You can always buy 5/16 lugs and when you need a 3/8 lug. Just drill out the lug hole with a 3/8 drill bit.

    Gary
    Be careful on this "fix"
    It can reduce the amperage the lug can handle. IOW, I would only do this as a temporary fix until the proper lug can be obtained, and know that the amp load needs to be reduced until then.
    2021 398M
    2020 Silverado High Country 3500 dually crewcab Duramax Allison

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