Need help with front signals, and tail lights...

[BrwnDevil]

Hello,
I have a 71 GMC C15. I recently switched all my lighting over to LED.
I have installed two LED flashers, both are grounded...
My issue is that my front marker lights with led bulbs don't come on, when I switch back over to the normal filament style bulb they are very dim.
When I use the turn signal the LED bulb with flash once....if I wait a couple seconds and try it again I get the same result, with old style they work properly, but stay extremely dim.

The brake light/tail lights work properly until I turn the lights on then they do not blink, they just light up and stay bright, no flashing.

I have done my best to take a look at all the grounds, everything looks good.

I have read many many many previous posts about dim lights and lights not working correctly, but no one has seemed to have the issue I have.

Any help would be appreciated, thank you in advance.

-Shaf