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86 GMC Sierra Classic 2500 questions
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11-02-2014, 09:59 AM
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dfrank
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Join Date: Aug 2014
Location: Pittsburgh, PA
Posts: 627
Re: What was this for?
Quote:
Originally Posted by
gmcnoob
Good morning. Can anyone tell me what this little black box is/was for on the left side of four-wheel-drive?
Maybe a trailer brake controller?
dfrank
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