Picked up a 1994 cal spa off CL. 8x8, dual pumps, PS 4B pack, no air, cover, fresh cartridge. leveled it, framed it, filled it up. Ran a temp wire (6ga aluminum) just to see if it worked. GFCI works, pumps work, PS4 works. Never got to the heater, the jets weren't coming on. Hit the booster pump...