Did your buddy purchase this rig or used? If the circuit in the garage is not protected by the sink GFI then it needs to be protected by a separate GFI. It's pretty straightforward. The line side on the GFCI is connected to the wire from the breaker. The load side gets connected to the wire from the other outlets.
Once the GFI is installed power must be supplied to reset it. A GFI will not reset if there is no power to it.
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Marshall
2012 Laredo 303 TG
2010 F250 LT Super Cab, long bed, 4X4, 6.4 Turbo Diesel
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