Wiring Problem with towing

[2000F150SAS]

Got the Flat Tow Answers I needed now I have a lighting problem.

I have a standard 4 pin plug from the factory on my 2000 F150.
White=ground
Brown=running lights
Yellow= drivers side blinker/stop
Green=passenger blinker/stop

I bought a magnetic light set for towing and when I put the light on the back and plugged in the connection this is what I get. I just towed a uhaul trailer last month and everything worked fine.

Running lights are bright
Blinker and stop lights are dimmer
When running lights are on I have NO blinker or stop lights

The light brightness should be reverse, bright for blinker/stop and dimmer for running.

HELP!!cratchhe:cratchhe:cratchhe:

THIS SHOULD BE VERY SIMPLE!!! But have been banging my head on the wall.

Thanks, John