Tail Light electrical issues

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Bloodwater79

Newbie
Joined
May 28, 2020
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Location
St. Louis Missouri, United States
So I have this weird problem.
my truck has the original tail lights and also lights in the rollpan. now I have all of it hooked up, and when I turn on the blinkers (left and right) they flash correctly, the brake lights come on correctly, but when I have the brake pressed and turn the blinkers on (doesn't matter right or left), the rollpan lights blink correctly while the taillights in the bed blink on the wrong side. If I lift my foot off the brake they flash correctly and match the rollpan lights.
I originally thought it to be a ground issue, ground a fresh spot on the frame and grounded it, even went as far as running a 10 gauge wire from the ground on the battery and isolating the grounds for the taillights and pan lights to that wire and they still do the same thing.
So scratching my head here and not sure what to look at next.
 
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