Dim Lights

So I've had some problems with my lights on my 71 Swinger being super dim. I fixed the problem with my headlights being too dim by chaining to LEDs. Thinking I could just switch to LEDs in the back and "solve" that problem I don't even have enough power to get the reverse light LEDs to kick on and the brake/parking lights are SUPER dim. Anyone else have a similar problem and a way to fix it?