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The polarity independent flasher did solve the problem.

Is there a specific motor flush that works well with Nailheads (I've previously used Motor Medic) or should I avoid them all together?
Also, I have always found good value in the BG products that...

I think I have answered my own question.
A polarity independent flasher should hopefully do the trick.
I will update once I have it installed.

Here is the item on Amazon.
...

Has anyone converted over to LED for their turn signals and/or brake lights for a mid 60's model?
If so, was a grounded electronic flasher enough or did you have to install resistors at every bulb?...

It's got the 401.

Nice to be joining you here!
I've owned classic cars and trucks for almost 2 decades, and I've recently aquired a 1966 Buick Electra 225!
I joined this forum to better take advantage of the wealth...