found a little jewel for you guys.

[hzhardy]

Here is a link to many gm up fitter manuals. I just downloaded one and it is over 600 pages of wireing diagrams and connector locations and identifications for everything. It even has oin outs and descriptions of wires purpose. They already have the 2014 manual up. If you want to know how to add an option it is all in here. Enjoy includes all gm vehicles

http://gmupfitter.com/pages/body-builder-manuals

[Chris]

What years are covered?

[hzhardy]

99+

[hzhardy]

Select the "view light duty" or go heavy if you have a top kick or similar and it list the 2011 to current and a selection for 2011 older.

[Chris]

I will have to look at this

[hzhardy]

I know it probally should go over to the tech forum but i felt this is just to good of info and this forum here gets alot of traffic.

[geektoad]

Nice find! thanks for posting.

[mzodarg]

Thanks, I downloaded a couple of manuals. One thing I noticed is that the TSB link on the page is not by VIN, there was only 2 list for a 14 Silverado.

[newdude]

Interesting note. Those looking for wheel offset from the factory its in these guides.

[hzhardy]

These have everything you could think of include truck boxes, police lights, pto, snow plows basicly any utility mod you could imagine plus wiring for all systems

[hzhardy]

Even shows you how to build your own fog loght harness

[LOCALOUTLAW]

Wow...great information.

Thanks hzhardy!