I think that as long as the wires are intact it should work as designed, to dissipate heat. It does look a little crusty, as some of the ceramic material has chipped off.
Maybe wire it up on the bench and test it.


Kevin
1951 Chevy 3100 work truck
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1929 Ford pickup restored from the ground up. | 1929 Ford Special Coupe (First car)
Busting rust since the mid-60's
If you're smart enough to take it apart, you darn well better be smart enough to put it back together.