I have 2005 Tc29da hst. Does not like to start when cold below 50 deg F. Glow plug light will not illuminate. When tractor is warm glow plug light works and fires up normal. I have repair manual 87057411 12/04 a little confusing on what relay is what. I replaced glow plug power relay#3. I am looking for glow plug timer relay#7 and glow plug lamp relay#6 from glow plug circuit on page 55-32 . The relay descriptions and location on page 55-29 says relay #7 is pto safety interlock relay. Ignition switch tests ok.