OK below are links to the diagrams and explanation of what each wire does. Let me know how I may assist further and if you have any trouble figuring this out,I am here for you. The heat kit should have a 9 pin plug that plugs directly into the factor plug.
Here is abreakdown of th wires on the 9 pin plug by each pin:
1 is brown low voltage .It wil be going to W2 .AUX on thermostat and coil on sequencer
2 is orange low voltgae and also goes to the coil on the sequencer but basically not used with one stage heat (It would be used with 15KW or higher or 2 stage heat thermostat)
3 is white high voltage from contator and goes to nothing on heat kit
4 is red also high voltage but not going to anything on heat kit
5 is blue high voltage to fan relay and heat kit
6 is Yellow high voltage to fan relay and orange to heat kit
7 is grey low voltgae common from transformer and to sequncer coil
8 is unused
9 is white high voltage power fan and power to heat kit
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