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Thanks for the replies. I guess now what I need is a definitive answer on what specifically triggers the relay to close and send power onto the glow plugs?
I am trying to make sure that the relay itself is bad as opposed to whatever may trigger the relay to close. As of now, for all I know the relay may be good and the problem may be that it's getting a signal to close when it shouldn't be getting such a signal. Would I be correct that if the violet wire is still supplying voltage once the engine has been running for a few minutes, this is bad? What specifically powers the violet wire and what opens to stop the voltage from flowing through the violet wire?
My issue is that the GPs and relay work as they should at initial start up, but after turning off, they re energize. I have confirmed this through my after market voltage gage that I have on the dash. When I go to the glow cycle voltage drops and stays down for about 40 seconds (even though the dash light only stays on a short fraction of that time), the relay opens with a "click" after the 40 seconds and the voltage goes back up. Car starts beautifully, but after a few seconds the relay closes again. What first tipped me off to this was the GP dash light illuminating while I drive. At first it would flicker on once in a while. Now it flicker off once in a while. Yesterday when I got home following a 30 minute highway drive the GP dash light was still on. I popped the hood and checked with a volt meter confirming that the GPs themselves were indeed all getting power.
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