Rachelle,
I seem to remember you saying you had changed the glow plugs to the pencil type. If I am correct, did you add a relay or install a "fast glow" kit?
I don't think your car had a relay originally and the filiment (in the salt shaker)only glowed after the loop type glow plugs got current in a series system.
I believe you had to change the entire wiring to use pencil type glow plugs and should have changed the filiment.
If you used the fast glow kit they should have sent you a relay for the wiring and a light bulb to replace the filiment with.
If you installed a relay and made up your own pencil type system then you should have designed a different way to power the filliment.
I may be confused but I think you have something wired incorrectly.

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Ncnetman
1978 300cd fresh paint
1965 Mustang
1968 Torino GT fastback
2015 VW Passat TDI
1969 Ranchero- project
1974 240d 4-speed -for sale
1976 240d - for sale
1990 6.2 Suburban 194k-getting a 6.5 turbo
2008 Duramax Silverado-totaled
1959 Chev 3100 Fleetside - sold