cold starting issue

[steve]

My 2018 1526 with 300 hours has cold starting issues at times. Spoke to dealer and he said there were some glow plug controller issues, so he checked for a recall but none available for my tractor. I am going to check bussbar connection, but he mentioned if controller was bad installing a separate switch, instead of purchasing a new expensive controller. Has anyone had the same issue, and have any recommendations?
Thanks
Steve