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No start - glow plug relay?
Everything has run perfectly, but one day won't start (2000 F350). Starter turns, engine turns, but won't kick over at all, not even a little. Acts like no fuel, so replaced fuel filter. Reservoir is full and pressurized.
Daily temp is over 90F here, but was told glow plugs are still in question. Checking glow plug relay: there are two relays next to each other and look very similar, only one is shorter than the other (shorter is towards rear of engine, taller towards front). Which is glow plug relay?
Shorter relay appears to work as expected for glow plug: Battery voltage on one large post, energizes other large post when ignition is turned to On, releases after a minute or two. One small side post is energized with key on, other is not.
Taller relay has Battery voltage on one large post, but other large post does not get voltage when key is On. Both smaller posts have voltage when when key is On. My guess is bad relay, but what does it go to?