OK I'm confused. Tail lights should only work when the headlights are turned on. Do the brake lights work when the pedal is depressed or the blinkers/hazards are engaged? The terminal location labeled battery should provide constant 12V from the battery, but I don't think that is what you need/want.
I have the Digi-Tails 1100167R - Sequential LED Tail Light Panel Kit on my 68 Camaro. This kit requires a dedicated 12 vdc battery supplied voltage to each light assembly to operate. I had to run a new wire from the tail lights to the fuse box and plug it into the BAT terminal. I tested the lights using a lawn mower battery positioned in the trunk. If that new additional wire is not used and connected to battery power (fuse box BAT terminal), lights do not work properly.
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