If you suspect your glow plug relay is going bad you’ll want to check the voltage to see if you actually have power going to and from the relay. You may hear an audible clicking sound from the relay when the ignition is tuned on and off, but you’ll still need to verify you have power actually going to the glow plugs. If you determine that the relay is in fact good, then it would be safe to say it something further in the engine (injectors, glow plugs etc.).
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