Kohler 30-125REZGT Industrial Generator Sets Wiring Diagrams (tp6936)
These Kohler 30–125REZGT industrial generator sets usually sit in plant rooms or outdoor enclosures, backing up buildings, pumps, or critical loads when the grid drops. This wiring-diagram manual is what I’d pull out when I need to trace circuits, confirm harness routing, or prove a control issue is electrical and not mechanical. For example, if the set won’t transfer or won’t start from a remote signal, these diagrams let me follow the wires from the controller, through each connector, right out to the field terminals and isolate where the signal dies.
Applications & Use Cases
- Verify wire routing and connector pin-outs after replacing or repairing a harness.
- Trace control and sensing circuits to isolate no-start, no-crank, or no-output complaints.
- Continuity-test individual runs so you can separate a bad wire from a bad component.
- Plan and check retrofits like remote start/stop, alarms, or monitoring modules.
- Confirm grounding and shielding paths to reduce nuisance trips and electrical noise.
FAQ
Q: Can I zoom in on individual circuits on a tablet or laptop?
A: Yes, the diagrams are usable digitally; zooming in makes reading connector labels and wire IDs much easier in the field.
Q: Is this worth printing, or should I keep it only on a device?
A: I’d do both—print the key sheets for greasy hands in the enclosure and keep the full file on a device for detailed tracing.
Safety Note
Always de-energize and lock out the generator and related circuits before probing or moving any wiring.
📘 Show Index
Kohler 30-125REZGT Industrial Generator Sets Index:
- ADV-5875
- ADV-8636
- ADV-8637
- ADV-8667
- ADV-8668
- ADV-8701
- ADV-8702
- GM62554
- GM90751
- GM90791
- GM92204
- GM92213
- GM93099
- GM93200
- SB-755
- Controller Description Version 2 Page
Decision-Makerr 3500
Controller with voltage
selector switch
Point-to-Point Wiring
Diagram
Sheet 1 GM92204C–1 43
Sheet 2 GM92204C–2 44
Sheet 3 GM92204C–3 45
Sheet 4 GM92204C–4 46
Schematic Diagram
Sheet 1 ADV-8667C–1 15
Sheet 2 ADV-8667C–2 16
Sheet 3 ADV-8667C–3 17
Sheet 4 ADV-8667C–4 18
RSA III Wiring Diagram
Sheet 1 GM62554K–1 29
Sheet 2 GM62554K–3 30
Sheet 3 GM62554K–4 31
Sheet 4 GM62554K–5 32
Sheet 5 GM62554K–6 33
Sheet 6 GM62554K–7 34
Service Bulletin SB-755
(Referenced on
GM92204/ADV-8667)
SB-755 59
Decision-Makerr 3500
Controller without voltage
selector switch
Point-to-Point Wiring
Diagram
Sheet 1 GM92213B–1 47
Sheet 2 GM92213B–2 48
Sheet 3 GM92213B–3 49
Sheet 4 GM92213B–4 50
Schematic Diagram
Sheet 1 ADV-8668B–1 19
Sheet 2 ADV-8668B–2 20
Sheet 3 ADV-8668B–3 21
RSA III Wiring Diagram
Sheet 1 GM62554K–1 29
Sheet 2 GM62554K–3 30
Sheet 3 GM62554K–4 31
Sheet 4 GM62554K–5 32
Sheet 5 GM62554K–6 33
Sheet 6 GM62554K–7 34
Alternator Reconnections
Sheet 1 ADV-5875U–6 7
125REZGT Wiring Diagrams Reference
Controller Description Version 3 Page
Decision-Makerr 3500
Controller with voltage
selector switch
Point-to-Point Wiring
Diagram
Sheet 1 GM90751F–1 35
Sheet 2 GM90751F–2 36
Sheet 3 GM90751F–3 37
Sheet 4 GM90751F–4 38
Schematic Diagram
Sheet 1 ADV-8636D–1 8
Sheet 2 ADV-8636D–2 9
Sheet 3 ADV-8636D–3 10
Sheet 4 ADV-8636D–4 11
RSA III Wiring Diagram
Sheet 1 GM62554K–1 29
Sheet 2 GM62554K–3 30
Sheet 3 GM62554K–4 31
Sheet 4 GM62554K–5 32
Sheet 5 GM62554K–6 33
Sheet 6 GM62554K–7 34
Service Bulletin SB-755
(Referenced on
GM90751/ADV-8636)
SB-755 59
Decision-Makerr 3500
Controller without voltage
selector switch
Point-to-Point Wiring
Diagram
Sheet 1 GM90791C–1 39
Sheet 2 GM90791C–2 40
Sheet 3 GM90791C–3 41
Sheet 4 GM90791C–4 42
Schematic Diagram
Sheet 1 ADV-8637B–1 12
Sheet 2 ADV-8637B–2 13
Sheet 3 ADV-8637B–3 14
RSA III Wiring Diagram
Sheet 1 GM62554K–1 29
Sheet 2 GM62554K–3 30
Sheet 3 GM62554K–4 31
Sheet 4 GM62554K–5 32
Sheet 5 GM62554K–6 33
Sheet 6 GM62554K–7 34
Alternator Reconnections
Sheet 1 ADV-5875U–6 7
Kohler
