I have a John Deere 855D that has progressively gotten harder to start in cold weather. I am guessing it is a glow plug issue. The light on the dash does not come on and it is not a bulb issue as i put a new bulb in it. I checked it with a simple light tester and power is coming to the socket but the bulb does not come on. I have checked the fuse but not sure where the module for the glow plugs is located? Have not removed any glow plugs to check them just trying to be sure it is not an electrical before i remove any. Any help would be much appreciated!
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