Tom Platten posted:

I picked up a 153 Block Signal at a swap meet to put on my "G" gauge layout hanging from my patio ceiling. Are the two out side terminals supposed to insulated from the base?

Yepper.  The center terminal is common.  The other two outside terminals are to the red and green bulbs.  Typically the green bulb terminal would be connected to a Normally Closed (NC) terminal on your track sensor of choice.  The red bulb would be connected to the Normally Open (NO) terminal. 

If the bulb connections didn't each have an insulated lead terminal, you'd have a dead short at your accessory.

KD

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