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Cooler weather has arrived and my 2000 f250 won't start. Wait to start light is coming on, no power passing through the two relays on top of the engine. Are both of these for glowplugs? My 97 only had one. How do I diagnose relays on this truck? If you cross out the two relays truck fires right off so I know the glowplugs themselves are good.
I'll echo what JLH3 posted above. Go with a stancor. Very sturdy unit comparatively.
Your AIH doesn't react the same way as your GP relay. Plenty of threads in here to search on that so I won't whip a dead horse.
BTW, when was the last time your GP's were replaced regardless of todays performance.
If it's been 5 years, think of replacing them regardless. Think of it as a tuneup on a gasser. Cheap insurance and maintenance minded, a very inexpensive opportunity to avoid pulling a head if they decide to balloon on you.
Did you look at the link that jhL gave you to Guzzle's website? That pretty much tells you everything you need to know on the relay. If you got it to fire up by jumping the lug on it before, it can't be the harness or UVCH, so maybe you got a bad relay from the auto parts store.