"I have had as many issues with the wires connector as with the bulb to flex board area. "
Yes exactly. The tongue of plastic you fold the flex circuit over squeezes out from the heat generated there. So you wind up cutting off the connector and soldering the harness wires directly to the flex board.
I hated to do this, because it meant I couldn't easily remove the tail lamp assembly to the workbench to mess with it. Here on Brickboard, the long time member Tony Hoffman made some ingenious circuit boards to lick that problem. Made them a long time ago. The connector is a standard card-edge connector, just like you find up at the rear of the speedometer.
Aside from being a new connection surface, the glass epoxy substrate doesn't deform like the thermoplastic, if heat were to develop.

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Art Benstein near Baltimore
The dead batteries were given out free of charge.
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