70 Mach 1 Turn Signal Indicator light issue,

[70 Mach]

Replaced all cluster lamps with LED's , Rt turn signal lamp not working. I changed the lamp to another LED then back to the incandescent lamp, still not working (Rt turn Signals do work) I have a brand-new circuit board if you can call it that and I traced the entire board which took some time and can't find any issues. Does anyone have any suggestions?

Thanks!

Even with the LED's the gauges aren't that bright, should have replace the plexiglass when it was apart.

 

[Mach1 Driver]

The 70s have a very odd-ball turn signal circuit. The marker lights are in series with 10 other light bulbs.
I know you changed the cluster lights, and two of those lights are the dash turn indicators. I would replace both of those with the original incandescent lights, and see if that fixes your problem.
The only company I'm aware of that has exterior LEDs that work on the 70 is Vintage LEDs. They have lights designed just for your year.

The dim dash backlighting is the result of the indirect lighting. My 69 shares the same dash, and the brightest LEDs I've found for the 8 backlights is:

HyPo Parts 194R-20PS-WM

Choose a warm white around 2700k and they will look just like brighter versions of the incandescent lights, with no need to even change the blue filters.