Question about Kohler 12 kW Emergency Power System - 12RES-L

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Kohler 12k a few yrs old, will not crank, i hear a short click but then cc1...oc error...new starter and selonoid...all fuses ok

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Hello. As these age, there is a tendency for a nonconductive layer to form on the connections between battery and starter, battery and ground etc. Disconnect these cables and clean then with emery cloth. Clean the battery posts. Reconnect all making sure the connections are tight. Spend extra time where the ground wire connects to the side of the unit. Scrub it clean and connect it tightly. Then REcharge the battery and crank it over. It should take off.

Posted on Jul 09, 2010

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Posted on Jan 02, 2017

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Kohler 12 RES - Unit fails to start occasionally. Attempting a manual start by placing switch in run position, cause a loud click, but no cranking. The panel says CC. This morning I put a jump start...


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are you sure the engine isn't locked up can you manually turn engine??
try hitting the starter it may have a bad connections from a worn brush if by
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Have Kohler 12RES. Gives a CC1 code thenan OC code. Have checked out the starter, it's OK, have cleaned all ground cables and connections and had the battery tested it's OK. Where do I go next?


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.

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U need to make sure that the relay driving ur auto start stay closed all thru the crank cycle.

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When I try to start my generator the code oc comes


Check battery volatge while you are cranking engine if voltage drops below 9 vdc you have a bad battery. If it doesn't you probable have a bad starting solenoid or a bad ground at the starting solenoid.

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Hello, I have a Kohler Marine Generator that says OC on the menu when I try to start it. Any ideas?


OC stands for Over Crank. How long does it take before the genset starts?

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