My '04 Grand Marquis appears to have a potential electrical issue?

You have a short somewhere between the steering column and the relays. Inspect the wires brackets and wires to see if there is a loose contact.

First, check the wiring harness to the wiper motor. There's a plug held onto the firewall by a bracket. Mine was burned up, and I think it's common, since it's exposed to so much weather. The Ford dealer tried to say they didn't stock them anymore, but I looked online myself and found it; it will have a pigtail with connectors, but it's easy to replace. I think that was my problem, though we also replaced the wiper motor, and the 'multi-function turn switch' on the steering column.

The turning gives me a clue, There's some brushes and contacts under the wheel. One needs to pull the air bag and the wheel. Could this be it? Usually only cruise control and steering wheel buttons affected, but the turning makes me think.That multifuncion turn switch could be it, also.