Almost got this block heater in place and ready to go for winter.
But I would like the bunk heater to work in case I want to do some winter camping.

This link is for a different unit than mine, but it was the only refrance to my thermostat controller.

See page 9 - Unit 2 (D9W plumbed with an OEM heat exchanger.)

http://www.espar.com/documents/D9W.pdf

Where is the heater relay located? Is that referring to the blower relay that is located under the large plastic case in front of the fuse box?