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Spliced my third brake light into my left brake light the other day. Appeared all worked correctly till my wife told me that it was not working. After some troubleshooting it only works when my lights or parking lights are off. Turn the parking lights on and no third brake light when the brake is depressed. Any ideas what I got wrong?
 

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Is it possible that the tail lights simply don't get enough juice to light up the third brake light when it is also supplying juice to the parking lights?
 

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I installed a switch under the back seat and tapped into the 3rd brake light wiring that runs through the channel under the rear door. That allows me to switch between the cab 3rd brake light and cargo light and the cap.
switch.pdf
 
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