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I just did some checking. The m1009 used 2 12v alternators 1 for each battery. The ground would be likely from the engine block to the battery (not both batteries!) or somewhere along that route. If you use 2 sets of jumper cables 1 to front batteries and the other to the back batteries. This...

The starter should be grounded to the frame. If this wire gets loose it can cause the truck not to start or to turn over slowly like the batteries are dead even when they are fully charged. It would usually give other symptoms as it goes bad like when you hit the start button it just clicks...