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New GMC Sierra 2500HD, Need more detailed information


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Just bought new GMC Sierra 2500HD CC Z71 4.10 SLE with SLT package, 6.0 gas burner and have read through the manuals and find they aren't very detailed. It even has a Engine Block heater option " never seen that ". before

 

Wanting to install AUX Battery and couldn't find an information covering the "Relay " that some have, Wanting to run Power Wires for Commercial radios / Ham Radios and need to see if this can be done on the inside of cab or through the firewall. Looked at GM Upfitter pdf and didn't much I could use.

 

So any links for 2015 models for technical electrical, pics of radio installs, etc, service manuals...are appreciated.

 

Thank you

 

Ken

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There is a rubber grommet in the drivers side firewall for running electrical equipment to the cab, remove plug and drill out a hole big enough to run wires, reinstall plug and silicone hole in plug.

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