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1.4 PMU Power Distribution

Engine bay power distribution handled by ECUMaster PMU24, a programmable power management unit with 24 outputs replacing traditional relay/fuse panels.

Location: Engine bay

Power Connections

Connection Source Wire Gauge Protection Notes
Main Power START battery+ 2/0 AWG 250A CB Optimized for 220A max load with proper protection coordination - See Circuit Breakers
Ground START battery- 2/0 AWG N/A Matches power wire gauge for 220A max load - See Grounding Architecture
Ignition Sense ECM Ignition Relay output 18 AWG N/A Dedicated wire; relay driven by PMU OUT24 - see PMU Inputs and Keyless Ignition
CAN Bus Cummins ECM J1939 18-20 AWG twisted pair N/A Stub tap - see PMU Inputs

System Components

  • 1.4.1 - Overview - Product specifications, capacity analysis, features, mounting
  • 1.4.2 - Inputs - Digital/analog inputs, CAN bus integration, ignition distribution
  • 1.4.3 - Outputs - 24-output configuration, load analysis, combined outputs
  • 1.4.4 - Programming - Logic examples, sequential startup, configuration, outstanding items