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Thread: Battery terminal bolt size

  1. #1 Battery terminal bolt size 
    Car Fanatic CF Senior Member
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    Anybody know what size wrench to use on these? I need to do a head unit install in my mom's geo put dont have a wrench set, so I was going to go to sears and pick up the specific wrench I would need to disconnect the negative terminal but I dont know what size wrench to use. Thanks for the help
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    CF apprentice CF Senior Member Pistonhead78's Avatar
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    i would imagine it would be a 10mm, but thats over here and on british cars so may be diffrent
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    NKAWTG CF Admin Alchemist's Avatar
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    have an accurate ruler/tape measure?
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    911? I dial .357! CF Moderator
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    what kind of car? if its the grand am, your lookin at an 8mm.
    side mount terminals, right?
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    Quote Originally Posted by Serpico
    Anybody know what size wrench to use on these? I need to do a head unit install in my mom's geo put dont have a wrench set, so I was going to go to sears and pick up the specific wrench I would need to disconnect the negative terminal but I dont know what size wrench to use. Thanks for the help

    Because of corrosion, battery bolt and nut hexes often "shrink" a half-size or more over time.

    Most tool makers - Snap-On, MAC, Craftsman, etc. - sell "Battery Terminal Pliers" for this application.

    The ONLY time I use a standard wrench on a battery terminal is when I am installing a brand new terminal - or a new bolt in the terminal.

    Otherwise, I find the battery terminal pliers to work better in most cases when removing the terminals.
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    Car Tuner CF Senior Member
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    just see if nayone has a ratchet and socket set you can borrow....or a wrence set in your case
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  7. #7  
    deltaolds
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    don,t bother use regular pliers, it works.
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  8. #8  
    Car Fanatic CF Senior Member
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    I think I will try the pliers and see how that goes. Thanks guys
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  9. #9  
    911? I dial .357! CF Moderator
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    GM side terminal batteries are notorious for leaking battery acid at the terminals. if this is the case, your bolts and terminals may very well be seized in the battery. when you get your new battery, or reinstall this one make sure to use a di-electric grease on the terminals, and felt protectors. each are about 99 cents at autozone.
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