Low Beams dead, Hi Beam Fine?

"has to be that floor switch or the wire leaving the floor switch." not necessarily, it could be the bulkhead connector where the wire passes through the firewall into the engine compartment.
That would be where I start IF you are getting 12 volts out of both hi & lo output side of Beam Selector Switch, AND yet not getting 12 volts to the lo beam relay.

"I do not have lo beam power at the lo beam relay" by this, do you mean you are not getting 12v. at the trigger side of the relay-(relay terminal 86) check your hi/lo switch and bulkhead connections.
OR
Do you mean, No power at the side of the relay where power comes from the battery -(Terminal 30). Are these relays fused independently from the battery, (if so, check the low beam fuse) OR do they share 1 fuse? if they share, then fuse is not the problem because the highs work.

Terminal 85 should go to a good ground
Terminal 87 is the LOAD -(your headlights)