This article is a reference so you can make sure that all of your wires are correctly pinned and hooked up properly.  

HS2000 / HS2800 

Thermostat Wiring Harness connected to the circuit board under the access panel.

Thermostat wiring harness connection to the thermostat. 

Thermostat wiring harness connected to the thermostat with male / male connector

12V wire loom connected to the circuit board 

Motor / solenoid / Overheat sensor

HS2211 

Main harness connected to the unit 

Note: The Brown wire will not be connected. 

Connecting harness inside the blue end cap

Wiring harness connected to the circuit board inside the access panel

Note: The white wire with a red stripe you see at the top of the picture will not be connected. 

12V wire loom connected to the circuit board 

Motor / solenoid / Overheat sensor

Thermostat wiring harness connection to the thermostat.