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You should be able to do the high idle mod that idles the truck up for PTO use. I did it on my F250 back in 06 when I got it. I don't know if the F550 was any different. It is just a matter of connecting a couple of wires to a switch. I used one of my upfitter switches. Unfortunately it was so long ago i cannot remember which wires are which, but the truck should already be wired for it.
A bigger alternator is a got change even without the pump. I have a 200 amp Quickstart large frame alternator. The older style large frame alternators will bolt on without any changes to the truck.
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2006 F250 Lariat Supercrew, ESOF 4x4, 18" tires, FX 4, HD Alt., block heater, Integrated Trailer Brake Controller, Upfitters, power rear window, cab lights - delivered 10/25/05
Ford Remote Start; High idle mod; Timbren load levelers, Scangauge II, Blue Spring upgrade, Quick Start 200 amp large frame alternator replacement, 2 batteries; GPCM replace October 2011; 2 EGR valves; EGR Cooler replaced 12/30/11; Performance Machine & Mfg. coolant filter added 1/2/12; Rotella T6 5W40 oil; turned rotors and replaced brake pads for 1st time 1/7/12 101K miles; GPCM, both subharnesses and all 8 glowplugs replaced 1/5/13 at 118,000 miles; 2 Ford batteries replaced under battery warranty.
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