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Message: <blockquote data-quote="reaperman" data-source="post: 114399" data-attributes="member: 6675"><p>The fault code 21-03 indicates that the bobcat controller is not getting a voltage signal on wire 8550 telling it that the glow plug relay has triggered on when commanded. The problem could be a broken 8550 wire, or a faulty relay. Check if the glow plug relay is clicking on when the ignition is turned on. Also, check on the rear side of the fusebox to make sure all connections are plugged in. There is a rubber backing on the rear of the fusebox that you can probably "feel" through.</p></blockquote><p></p>