Page 7, Figure 5A of the attached IOM is the wiring diagram. FYI, the water heater gas valve 161109 is the older valve that was used from serial numbers 9534 (34th week of 1995) - 1646 (46th week of 2016). Since the 46th week of 2016 Thetford has been using the gas valve part # 161255 as their current part.
If you need the 161255 it is not currently on our site, but we can get it. If you need this one, let me know and I will get you pricing. https://www.rvupgradestore.com/v/vspfiles/assets/pdf/SuburbanWaterHeaterOperati