Shot as in when I tested them they did not produce any heat at all. I did not hurt my battery but the car would not start even after I ran the block heater. My expereince is they either glow or they do not. These did not.

I suppose it was when the last one failed that it stopped starting!

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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.