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Auxiliary Camper Battery for 2500HD Silverado

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I intend to install the camper auxiliary battery in my 2017 Silverado 2500HD.  A few of the parts needed are on hand such as a 12135194 isolation relay and some cables. Still need to get appropriate fuses.  The truck does is not equipped with RPO TP2, Battery, Auxiliary Camper option.  A parts list of GM parts for the TP2 Auxiliary Battery would be a big help.

 

I desire to get a layout drawing for the TP2 option harness and schematics.  Most important are;

1.) where best to get the energizing voltage for my isolation relay and

2.) where to best connect with the 30 Amp line going to the trucks existing 7 pin trailer connector and where to interrupt the existing 12 volts from the under hood fuse box.

 

Thanks

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