I actually used an old time delay relay out of an RV furnace (I have an RV repair business), but you could probably find one at Radio Shack. I think Peninsular Diesel also offers an adjustable time delay relay made specifically for the GM diesel glow plug systems.
Casey
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Project truck: '81 C/20 converted to 6.2L TURBO DIESEL bored .040", gear drive, 6.5L injectors/pump, custom pistons, custom 4" exhaust, 700R4, 4.10's
Daily Driver: '95 K1500 Tahoe, 6.5L TURBO DIESEL, NP241, 4L80E, 3.42's
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