Blinker flashing rev lights

[MikeMikeMike]

Sorting out electrical gremlins now...
When I turn on my left blinker (with the light switch in the OFF position) all lights function normally but I get a very dim blink from the reverse lights.
When I turn my light switch to either of the ON positions, the reverse lights blink much brighter.
The reverse lights blink ON when the signal light blinks OFF.
The condition does not occur for the right hand blinkers.

I have disconnected all the bulk head  and kick panel connections, inspected and applied dielectric grease and reassembled.
I have all new M&H wiring harnesses
The dash wiring was professionally redone.

Is this a problem any one else is familiar with?
Thanks
Mike

[Rich G.]

Weird light problems are usually a ground issue. Trying running a ground wire to the housing and see if the problem goes away.

[anlauto]

The dash wiring was professionally redone.

I hate chasing this type of electrical gremlins, but this is where I'd start....I've used customer supplied "professionally restored" wire harnesses before that had wires all crossed and mixed up...get out the FSM and start checking the orientation and wire colours at each switch.

[MikeMikeMike]

Thanks guys. Will do.

[Cuda Cody]

Sounds like a ground / short issue.

[blown motor]

The left blinker need new fluid.