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When did the light bulb socket for the heater control change?

dyeager535

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Mine and my Dad's truck are such a conglomeration of different year trucks that I don't know anymore what came from what year.

In looking for a way to hard wire the '90-91 dash cluster (with the stupid integrated socket bulbs), I happened to notice that on my Dad's heater control, the light bulb socket just pushed in.

On mine, the bulb socket is twist in, like the front side marker sockets.

His is *likely* a 70's model, but again, parts have been swapped extensively. I know mine is '81-91.

Anyone have any idea what year went to what, or can at least comment how theirs is, and what year?
 

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