Old soldier there should be one battery ground to the frame and all loads use that frame as a "common" ground. Losing the ground from one load would only affect that load. Losing the battery ground will affect everything as there would be no return path to the battery.
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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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