Sounds like you glow controller took a crap on you. It's not very common that both solenoids would stop working at the same time.

Like was stated before, you need to check each component individually but I am guessing you need to have the glow controller rebuilt. It's a common problem.

Spence
1985 Mitsubishi PU 2.3 Turbo Diesel, 13" lift, Watercooled turbo, 4D56 Head, Atlas II,Fox Coilovers, Elockers,

1983 Mitsubishi PU 2.5 Turbo Diesel 4x4, fully restored

2003 G500, sliders, beadlocks, roofrack, ladder etc.