Has everyone read their owner's manual?
Mine says:
If you are charging a remote (non-vehicle) battery, press the tow/haul mode button located at the end of the shift lever. This will boost the vehicle system voltage and properly charge the battery. If the trailer is too light for tow/haul mode, you can turn on the headlamps as a second way to boost the vehicle system and charge the battery.
So sayeth my 2008 GMC Sierra page 4-91 under Heavy-Duty Traile Wiring Harness Package
I do not have a manual for my 2002 Chevy Silverado because it was missing when I bought it used. So I do not know how that one is wired.
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