12V motor into what truck? I didnt have any problems with the 12V in my 99 F350. I deleted the vacuum pump and used the steering pump off of a 4BT out of P30 bread truck because it was a more compact way to do things, and there already is an electric vacuum pump under the hood for the HVAC controls. I havent had any issues with it since I installed it. A few custom lines are all that it took.