20 Most Recent Kohler 12 kW Emergency Power System - 12RES-L Questions & Answers


I finally solved the intermittant starting problem on my Kohler 12 RES by replacing the strater and the starter relay. I was also experiencing the occassional OC indication, red blinking LEDs on the ATS, and intermittent non-starts during the weekly exercises. The problem happened during power outages a couple times also. If I flipped the start switch between auto and run quickly the generator would occasionally start. Once started, the generator runs fine. I ordered a new starter, which included the starter solenoid. By the way, don't worry about the genuine part thing..the old starter was a Delco made overseas. I ordered a new starter online for $85 (6744N) and it was indentical to the genuine Kohler starter. Replaced the starter and it improved the problem but did not totally solve the intermittent starting. Ordered the starter relay (GM49746) replaced it and the problem is solved.

Kohler 12 kW... | Answered on Apr 14, 2019


i used to work at a repair shop for kohler 98 bucks an hour to check it out. and for them to repair who knows?. i would do my best if not in a hurry to figure it out on my own. you can purchsae a service manual and stick with your basics; spark gas, and from there go deeper.

Kohler 12 kW... | Answered on Feb 02, 2018


ask your serviceman if theres a battery in the controller. if so its probably dead and that would make it lose time settings i would think.

Kohler 12 kW... | Answered on Oct 05, 2017


You will likely need to reference your instruction manual for that specific control panel.

Kohler 12 kW... | Answered on Sep 24, 2017


Hi
If the starter battery is not taking a charge, then it may have failed and require replacement. It is not uncommon for a battery that sits on standby for long periods of time to eventual fail. Best approach is to contact Kohler direct or one of their service agencies to get the correct replacement battery for the generator system.
You can contact them here
regards robotek

Kohler 12 kW... | Answered on Jul 26, 2015


Valve seats, valve integrity, intake seals. Perform a leakdown test to further diagnose

Kohler 12 kW... | Answered on Mar 03, 2015


this sure sounds as if the low oil cutoff is activating for some reason , look at switch carefully to see any physical dammage (ck oil level as well)

Kohler 12 kW... | Answered on Jan 30, 2015


this is a common complaint to these , what it boils down to is allways a fuel problem , if its gasolene then its in the carb if it's nat gas then it's in the regulator/vaporizer
you'll have to clean these items to see if that helps . someof those liguid cleaners sometimes works but i find a good dissassembly cleaning to be the best

Kohler 12 kW... | Answered on Jan 30, 2015


OC is over crank failed to start. It will normally try 3 times before giving this error. You need to disconnect the battery and remove the starter motor, make sure it is free to move / spin. Either the starter has seized or the engine has siezed. Make sure the engine is free to rotate also, once you remove the starter you will see the engine flywheel there, removing the spark plugs will make it easier to rotate the engine. I would guess it is more the starter.

Kohler 12 kW... | Answered on Nov 08, 2014


Lowes sells air filters for Kohler engines . As far as the oil a SEA 30 or 10w 30 would be fine.

Kohler 12 kW... | Answered on May 30, 2014


The 'overcrank' error simply means it tried to start but never actually started. It cranked for an extended period. Check the fuel and starting issues you would normally check to start the engine.

If you need further help, I’m available over the phone at https://www.6ya.com/expert/craig_3fa289bf857b1a3c

Kohler 12 kW... | Answered on Mar 13, 2014


check your load wires there probaly reversed. I had the same problem friday. The week before the electrican wired it. did the same cc1 then oc. had a generator company come out it was the wireing. my load and netural were reversed.

Kohler 12 kW... | Answered on Dec 22, 2013

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