I would like to know how to make this old signal work again after about 80 years. It was my fathers. I made sure the bulb was good. I suspect that the thin wire gizmo with the distributer like contact might be the problem and I am not sure it's wired correctly. If I need to replace the gizmo (knowing the correct name for this component would be appreciated), Were can I get one?

Ed 

Original Post

Somewhere in my search for answers and info about this item it was referred to, perhaps incorrectly, as a block signal but it does, as you noted, say, on three sides, "Caution Drive Slowly" so I'm confident that we are referencing the same item. It's my understanding that it is supposed to flash intermittently.  Thanks,

 

Ed

I did try filing the contact but still no luck. Yeah, I thought the assembly was upside down in the picture. It had me thinking I had to flip it in mine. I'm going to have another go at fiddling with the wires before trying to find another thermal assembly. It does have a good bulb that I borrowed from another accessory.

Thanks,

Ed

 

 

 

 

There is no indication yet from the responses that the bi-metalic switch is bad.  If the bulb is dark, the problem could be just about anything.  If the bulb is on but not flashing, the problem is the bi-metalic switch or it's wiring.  Is the bulb on or not flashing ?

Steve

Ed W posted:

The bulb is dark, not doing anything.

This accessory is heavy reworked.  I would start by just trying to get the bulb to light.  As shown below there is supposed to be one wire that goes to the bulb.  The other connection is to the chassis.  Verify you can get the bulb to light.  Connect one power lead to the chassis and the other power lead to the wire going to the bulb and the light should illuminate.

 

Picture 12 of 12

Steve

I have had problems with these signals. Sometimes the problem is oxidation between the base and middle center casting. Or the bulb socket casting. As a experiment with your test leads, try one lead to the binding post on the wire going up to the bulb. Then with your other lead, scrape the inside center casting. This is to check if there is a problem with continuity between the castings. It won't flash, but should light. What Shorling said.

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