I'm having some problems getting my 1715 started after splitting and doing a clutch repair. Since getting the tractor used, several years ago, I've always needed to use the glow plug warming for the first start no matter what the outdoor temp. Now that doesn't even work. I had to use ether to fire it up. Can anyone instruct me how to troubleshoot the glow plug warming circuit? Second question -- Is it abnormal to need the glow plug warmer on a warm day and if so what should I check. Thanks!