Ok, its not the switch.
Battery connected, ignition and light switch off I have 8.5v at both dash turn signal lights (wire #737 & 738 ) keeping those indicator lights on constantly.
Battery connected, ignition off and light switch in parking light position I have power to front turn signals (#725 & 726) but nothing to the taillights or side marker lights which should also turn on.
Battery connected, ignition off and light switch in headlight position I have power to headlights, no tail lights, no brake lights and no flash or turn signals or side marker lights.
I am using LED flushmount tailights (tail, brake & turn). I have used the standard and LED style flash relays during testing.
LED bulbs are wired into #725, 726, 729, 748, 749 & 756.
I pulled the switch off completely and connected the battery to test voltage between the power wire and all of the others in the light circuit present at the switch. Testing between my power feed (728 ) and the following wires at the headlight switch with battery connected resulted in the following:
728-707 = 12.67v
728-729 = .193 (tail/brake lights)
728-727 = 12.67v
728-730 = 12.67v
Does that mean that the ground is poor for the rear lights (728-729)?
With the ignition key forward I also do not have wipers or blower motor operation.
Gauges work, fuel pump works with ignition key forward.
I connected one of the constantly hot dash turn signal wires to the speedo light and the flash relays started cycling which is has not done before even with the turn signal level activated.