Kohler 20-60REOZJC, 80-275REOZJE, 125REOZJF, 300REOZJ Industrial Generator Sets Wiring Diagrams (tp6697)

These Kohler industrial generator sets usually sit in plant rooms, hospitals, data centers, and pump stations, taking over when the utility drops out. This wiring diagram packet is what I’d pull out when I need to trace control circuits, verify harness routing, or sort out a no-start or no-charge complaint. For example, if the set won’t transfer or the panel is dead after a harness repair, this is how I’d confirm each wire is on the right terminal and the correct connector.

Applications & Use Cases

• Trace control and sensing circuits from the generator to the controller to isolate a dead input or false alarm.
• Verify wire routing and connector pin-outs after replacing or rebuilding a damaged harness.
• Confirm continuity and grounds when chasing intermittent shutdowns, nuisance trips, or random fault codes.
• Plan and check retrofits, like adding remote start/stop or monitoring, without back-feeding or miswiring existing circuits.
• Identify correct conductors when multiple models share a cabinet but use slightly different harness layouts.

FAQ

Q: Can I zoom in on these diagrams on a tablet or laptop at the unit?

A: Yes, they’re well-suited to digital use; zooming helps you read pin labels and follow wire numbers in tight panels.

Q: Is it worth printing sections of this, or should I keep it digital only?

A: Many techs print the specific sheets for their model and laminate them, then keep the full set digital for quick searching.

Safety Note

Always de-energize and lock out the generator and connected circuits before probing, disconnecting, or rerouting any wiring.

Kohler 20-60REOZJC, 80-275REOZJE, 125REOZJF, 300REOZJ Industrial Generator Sets Index:

Generator Set Model No. Hz Generator Set Spec No. Wiring Diagram Version No.
20REOZJC 60 GM73381-GA5 1
30REOZJC 60 GM73381-GA6 1
40REOZJC 60 GM73381-GA3 2
50REOZJC 60 GM73381-GA4 2
60REOZJC 60 GM57153-GA15, GM73381-GA2 2
80REOZJE 60 GM66069-GA1,-GA2 3
100REOZJE 60 GM66069-GA3,-GA4 4
125REOZJF 60 GM72460-GA1,-GA2 5
150REOZJE 60 GM70529-GA3,-GA4 6
180REOZJE 60 GM70801-GA2 7
200REOZJE 60 GM70801-GA1 8
230REOZJE 60 GM66100-GA4 9-1, 9-2, or 9-3
250REOZJE 60 GM66100-GA5 9-1, 9-2, or 9-3
275REOZJE 60 GM66100-GA6 9-1, 9-2, or 9-3
300REOZJ 60 GM66100-GA7 9-2 or 9-3

Kohler