On the PSD, glow plug timing is controlled by the computer and is not affected by the load on the selenoid. Bad glow plugs will not affect how long they stay on. By the way, the "wait to start" light on the dash has very little relationship to how long the glowplugs actually stay energized.
In the pre-powerstroke diesels, glow plug timing was based on the current drawn by the glow plugs, which would change as the plugs got hot and their resistance increased. With that system, if you lost a glow plug or two, the controller would think they were hotter than they really were and shut them down early, making starting even harder.
Do a search on thedieselstop dot com. There's a generic NAPA relay that's a direct replacement and costs (as I recall) about $30. Don't have the part number off the top of my head.
I have a '99, and am still on the original glow plug relay.
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