need help with glow plug relay going bad every other month

Are all your Glow Plugs good? Is the relay hooked up propper so its not getting Constant current and burning up? How long you cycle your plugs? Do you cycle everystart?
 
all glows are new the relay is in right cycle time is however long the wate to start light is on and i do wate the whole cycle every time i do not start it and shut it off every time i stop it stays running
 
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