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Old 04-21-2010, 11:45 AM   #1
TLightning
Montana Master
 
Join Date: Nov 2007
Location: Kville
Posts: 2,865
M.O.C. #7871
GM's Tow Haul Mode

Read today that in order to properly charge the battery in a towed RV, the T/H must be on...this boosts the truck system's voltage. If the trailer is too light to use the T/H, turning the headlights on will do the same thing.
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