Your Ford F53 460ci is stalling due to carbon buildup in the EGR valve disrupting idle air/fuel mixture. Clean the EGR valve and passages thoroughly, or consider an EGR delete with ECU tune for a permanent solution.
Service AdvanceTrac on F53 is a known software issue with a Ford TSB update available. Dealer reprograms the ABS module - typically 30-60 minutes. Safe to drive but cruise control and hill assist are disabled until fixed.
Independent Super C makers include Renegade (REV Group), Phoenix USA, and custom builders. Thor and Berkshire own most major brands. Focus on quality and service over ownership.
A speedometer that jams at 60 km/h on a 1999 Ford F53 is typically caused by a failed stepper motor in the instrument cluster. Since the odometer and cruise control work normally, the speed sensor is functioning properly and the issue is isolated to the gauge itself.
Speedometer stopping at 39 mph with working cruise indicates a stepper motor failure in the cluster. The motor can be replaced for $15-30 with soldering, or send cluster for professional rebuild.
Ford F53 cruise control uses a 3-pin contact ring system. Bent contacts are common and can be straightened. Clean contact surfaces and check continuity while turning the wheel.
Cummins in RVs are diesel engines or Onan generators. Gas chassis use Ford or GM. Cummins diesel and Onan generators need regular maintenance.
Your P0581 code diagnosis is correct - the ECU is detecting high voltage on the cruise control switch circuit. Since you've eliminated external wiring and switches, the PCM likely has an internal fault requiring professional repair or replacement.
The aftermarket trailer brake controller's red wire spliced into your steering column is likely interfering with the cruise control system. You can safely remove this connection, but the brake controller will need a proper 12V power source to continue functioning.
Injector issues cause misfire and rough running. Diagnose by scan codes and swap test. Clean or replace as needed.
Your 50-ohm reading indicates excessive resistance in the brake light circuit, likely caused by corroded connections, damaged wiring, or faulty bulbs. The circuit path runs from the brake switch through the turn signal switch to the rear lights.
Yes, there are aftermarket transmission controllers available for your 2007 E450 that can hold it in Drive gear. The most practical solutions include installing a manual shift valve body kit or an electronic transmission controller.
Engine replacement for Thor Challenger runs 8000-15000 complete. Jasper or Ford reman engines recommended. Get experienced RV shop quotes.
Tow/Haul mode works with cruise control. Use Tow/Haul for all RV driving - better shift points and engine braking.