Replacing Instrument Cluster bulbs with LEDs - Illumination Detail Question - 67 Barracuda

I too ran into that issue. Had to put the OE style brake light bulbs back in for the turn signals to work when the headlights were on. This is even using a LED turn signal flasher with the correct black ground wire. Wierd.
Yup!
I gave up on them today.
I disassembled the turn signal housings, cleaned up the lenses, and sprayed the reflective surface Chrome.
I had to dis-and reassemble once more, since I apparently didn't have the bulbs seated all the way, or correctly.
The old bulb receptacles were a PITA to get push in and seated all the way.
And when I went to test the again, I realzed that the housing probably gets a good ground from the screws in the grill support.
(Silly me thinking that becasue there were 2 wires that one was the ground - forgetting about the dual function.)
So a simple screw driver from the housing to the bumper allowed me to test the before reassembling.

I will make a worthy effort to get the tail lights converted to LEDs.
Even with the "newer" matching taillights, the lenses are aged enough to lose significan translucency.

(Ya, I know someone will tell me I should have purchased new lenses. But, all these parts expenses have to end somewhere.)
:realcrazy: