Kohler 25REZG, 150REZG, 80REZGB, 100REZGB, 80RZGB, 100RZGB Industrial Generator Sets Wiring Diagrams (tp6712)

These Kohler industrial generator sets usually sit in plant rooms, hospitals, data centers, or outside in enclosures, kicking in when the main power drops. This wiring-diagram manual is what I’d grab when I need to trace circuits, confirm connector pin-outs, or verify a harness repair on these specific REZG/REZGB/RZGB units. If, for example, the set won’t transfer load and you suspect a control‑panel signal or a mis-routed retrofit wire, this document lets you follow the wiring path instead of guessing.

Applications & Use Cases

• Trace control and sensing circuits from the controller to relays, CTs, and sensors to isolate no-start or no-output issues.
• Verify connector logic and pin positions after replacing a harness or swapping a control module.
• Continuity-test suspect wires end-to-end, using the diagram to know exactly which terminals should talk to each other.
• Check wire routing when adding accessories or doing field retrofits, so new runs don’t conflict with OEM circuits.
• Confirm grounding and shielding paths to track down nuisance trips or electrical noise problems.

FAQ

Q: Can I keep this wiring diagram open on a tablet while working on the set?

A: Yes, it’s practical to zoom in on connector details on a tablet; just protect the device from dust and moisture.

Q: Is it worth printing sections of this manual for a job?

A: Many techs print the relevant pages, slip them in plastic sleeves, and mark test points directly while troubleshooting.

Safety Note

Always isolate all power sources and verify zero voltage before opening panels or handling any wiring.

Kohler 25REZG, 150REZG, 80REZGB, 100REZGB, 80RZGB, 100RZGB Industrial Generator Sets Index:

Wiring Diagram Cross-Reference
Generator Set Model No. Hz Generator Set Spec No. Wiring Diagram Version No.
25REZG 50/60 GM69415-GA1,3,5 1
30REZG 50/60 GM69415-GA2,4,6 1
40REZG 50/60 GM66092-GA1,3,5 2
45REZG 50/60 GM66092-GA2,4,6 2
50REZG 50/60 GM66910-GA1,2,3 3
60REZG 50/60 GM66911-GA1,2,3 3
80REZG 50/60 GM66590-GA1,3,9 3
80REZGB 60 GM71610-GA1 4
80RZGB 50/60 GM71610-GA11 4
100REZG 50/60 GM66590-GA2,4,10 5
100REZGB 60 GM71610-GA2,9 6
100RZGB 50/60 GM71610-GA12,15 6
125REZG 50/60 GM65362-GA1,2,5 5
150REZG 50/60 GM64060-GA1 5

Kohler