How long were the jumper cables they tried to use? 6 inches? It's only about a foot from the passenger side battery positive terminal to the small terminal on the starter relay. Or it's about 2 inches from the hot terminal on the relay over to the small terminal.
It sounds to me as if it wasn't exactly clear to the OP exactly from where to where he was supposed to jump. Maybe he was trying to jump from the battery terminal down to the starter, and the cables weren't long enough, or possibly there wasn't clearance and the battery cable terminals couldn't fit into where he was trying to put them. Maybe with a clearer explanation he can understand exactly from where to where he is supposed to jump.
2001 F350 XLT 4X4 crew cab, dual rear wheels, long bed, black, 7.3l turbo diesel, automatic transmission, 4.10, shift on the fly, running boards, sliding rear window, 38 gal fuel tank, Odyssey extreme 65-PC1750T batteries, Michelin LTX-MS2 rear tires, Sumitomo Encounter front tires, Shell Rotella Ultra elc, 11,500 gvwr, 20,000 gcwr, 7500 gvw, completely stock, 114,000 miles when purchased, now has 250,000 miles, repairs so far: two starters, batteries, cps, brakes, tires, alternator, ball joints, locking hub, wheel hub, AC compressor, serpentine belt, power steering pump, driver's side window, ignition switch, o-ring, Spectra premium radiator, water pump, fan clutch, fan blades, thermostat, thermostat housing, tensioner. Stolen twice so far, but recovered both times with major damage.
2005 Nomad Rampage toyhauler made by Skyline. 11,500lb gvwr.