I am trying to replace two, non-grounded outlets with GFCI outlets. I have included a (horribly drawn) picture to illustrate the configuration.
One outlet had two wires attached originally while the other had four. Both outlets are on the same circuit. I connected the two wires from the original outlet on the left to the 'load' terminals. For the other outlet, I connected two wires to 'load' and two wires to 'line'. After turning on the circuit breaker, I measured 0 voltage across both outlets. I switched 'load' and 'line' on the the right outlet and had the same issue.
Interestingly, the little green light on the right outlet turns on while it remains off on the left outlet.