E2 heating error on Dual Extrusion

#1
I'm having heating issue as discussed in gCreate's "Heating Failed" post today.
They suggest to check connections
I've checked physical connections, but be sure they are in the correct place. A coworker set up this gMax 1.5 Dual Extrusion a long time ago. He is no longer with company.
I really need to see a wiring diagram / installation manual to check if everything is connected correctly.

I need to know which power wires go for which head? circled in red
Green/White for head?
Red/Black for head?

I need all of the details about the circuit board. circled in green.

On the resources page "Dual Extruder Installation" has no link to info.

Can anyone help?
 

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