I see with some regularity on 1969 cars what appears to be a ballast resistor on the firewall. I've circled it in the pictures below I took from ebay. I don't see any illustrations of it in the AIM and my 69 does not have it.
What is it's function? Is it an owner addition or original, a model year change, or based on an option?
John
What is it's function? Is it an owner addition or original, a model year change, or based on an option?

John
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