Glow plug light on means you have a short circuit at one or more of the glow plugs this conditioneans none of your glow plugs will assist with starting. When you installed the connection wires on your engine they must be printed down if not when the intake manifold is nstalled the manifold will cause shorts.

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92 e300d2.5t
01 e320
05 cdi
85 chev c10