7.3 IDI glow plug relay keeps failing
 

Ok I have had this issue twice within a week, the relay for the glow plugs will work fine for a day or so then the relay just straight up melts. The only terminal it's effecting is the one for the glow plugs. All other components of the relay are fine, but once it melts it won't get power unless I I make a direct link from one terminal to the other. Anyone have any idea why this happens? A short or just bad luck and got a defective relay? I'm new to owning a diesel so I don't really know what's causing this.