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The third battery should be jumpered to the other two in parallel. The white group cables will go on the negative post and the black on the positive. You may want to check out our Gulf Stream Owners Forum further down the list. If you still have a need for assistance let us know.
Mike, RVIA & RVSA Certified Master RV Technician
Amy, Dr. Assistant - Roxie & Mei Ling, four legs each
2000 Gulf Stream Scenic Cruiser 450 hp & 1330# torque
06 Saturn Vue, 06 Chevy Z71 4x4 & 2014 Corvette Z51 M7