Main Harness

The interactive diagram below shows all active wiring in the Rush SR main harness (Gen2 drive-by-wire). Click any wire for details, or use the circuit toggles to isolate individual systems. Click “Wire Reference Table” on the dash panel for a complete wire list.

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Power Distribution

Wire colors use the Suzuki convention: first letter is the base color, after the slash is the stripe. For example, R/W means a red wire with white stripes.

The main 30A fuse supplies power via a red (R) wire to the dash panel On/Off switch. From there, power is distributed through two main circuits:

W/Y (Ignition circuit) — powers the ECU and feeds the Run switch. The Run switch outputs W/R wires to ignition coils, starter button, and fuel switch.
W/G (Signal circuit) — powers the shift harness, AiM data logger, brake light relay, and other auxiliary systems.

The fuel switch controls the fuel pump relay. When energized, the relay outputs R/W power to the fuel pump and all four injectors. The ECU controls each injector and coil individually via ground-side switching.

Battery voltage

The normal operating range for system (battery) voltage is roughly 11.4 V to 13.6 V. Expect a sag of up to about 1.5 V while the rear radiator fans are on. The sag is larger on an AGM battery and much smaller on lithium, which also runs slightly higher voltage.

This is normal, not a charging-system fault. A reading in this range — including a 12.25 V dip when fans or compressor kick on — does not mean the regulator/rectifier, battery, or main power connections are failing. Diagnose the charging system only when voltage stays below the normal range with no load, or sags far beyond ~1.5 V with loads on. There is no documented dash voltage alarm threshold.

Reference Diagrams

📥 Download: main harness wiring diagram.png Original annotated Suzuki schematic showing removed OEM components (crossed out) and Rush SR modifications.