The cruise hasn't always not worked at 70MPH... It did work when I first installed the amplifier (for maybe 2 or 3 wk). While driving today I had it cut out at 69mph, resetting instantly (by 'resuming' with the selector arm), accelerates fine with the 'accel' function, holds fine on level ground, but right at the bottom of the hill during the transition from downhill (or level) road to uphill or just slightly up the hill it cuts out every time.
I personally don't think it's speed sensor related... Maybe the higher-current draw which occurs during the transition from light throttle to accelerating is causing this? How come not during uphill sections below this speed (which requires identical or greater amounts of throttle input, often being completely 'floored') without failure. This is the reason I'm stumped. 
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Erik deVries
ASE Certified
Automation Engineer
1985 Mercedes 300SD 375,xxx miles, Euro-headlamps, Bosch HID, Boston/Alpine audio
1982 Mercedes 300D 358,000 miles Boston audio, FOR SALE
1997 Dodge 2500 4x4 long bed ext cab Cummins 5.9L, BFAF, ATS trans, billet converter, #0 torque plate full-forward, star wheel full forward, (~295HP & ~680lb/ft G-tech), 5-inch turbo-back exhaust, VIAIR on-board air, LOUD Nathan K5 TRAIN HORNS  , 35-inch; BFG Mud Terrain, 2006 Ram 2500 17-inch Aluminum wheels.
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