High idle mod
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Joined: Feb 2004
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If you could find the wire and value the gas pedal sensor is sending the PCM you could modify that signal. It was built in my 05 F250 I just soldered two wires together to use the BCP idle which was a 1200rpm base and monitored battery charge. It makes the A/C kick a lot harder down here in Texas. My A/C barely trickles cold at idle...
See the discussion links and diagrams in that other "Try This" recalibrate thread in the Engines forum.
MGD
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From: willow glenn
im not really sure where voltage came into the conversation. the only reason you'd need to keep a alternator at a higher RPM as i described would be for amperage output. new alternator or not, no alternator is going to be able to keep up with the demands of a winch and having a second battery is just a really really gay bandaid. Warn's 12.5K winch at maximum load uses around 500-600amps. the goal is to be able to keep the alternator spinning where it makes most electricity so the battery replenishment is at its most efficient level. plus if im in a situation where i need a winch or excessive amounts of lights, fuel consumption is probably going to be last on my list 
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Joined: Jul 2010
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From: Louisville, KY
some accessories you simply cannot overcome the need to tap into the batteries supply, for instance a winch. high torque electric motors demand impossible amounts of electricity. the main goal is to limit how much electricity is being drawn from the battery by keeping your alternator(s) in their peak output range.
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Joined: Nov 2008
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From: willow glenn
some accessories you simply cannot overcome the need to tap into the batteries supply, for instance a winch. high torque electric motors demand impossible amounts of electricity. the main goal is to limit how much electricity is being drawn from the battery by keeping your alternator(s) in their peak output range.
this is what i was told buy a ford service manager.
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Joined: Jul 2000
Posts: 488
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From: MI
Our trucks operate on Voltage control. Current is provided as needed by the alternator. Though at idle, the alternator cannot produce alot of output and is more likely to be in full field if alot of loads are on.