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The relay is activated by a 12 volt source, but switches the 24/12 volts to the glow plugs. Disconnect the contact portion of the relay and see if it still chatters. If it still chatters, then remove the relay and hook the coil of the relay up to the battery with a good cable and see if it...

If you end up needing a GP controller, I suspect you could buy one from antennaclimber. I wouldn't think shipping would be that bad, and his prices are excellent. Also, they are new, not refurbished.

My guess is that it is the glow plug module or the glow plug relay. Try pulling the module and looking for fried components. Also clean the contacts on the board edge. Just use a pencil erasser to shine them up.