Question about Generac Electrical Supplies

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Realize my generac 8kw generator is not running, has overcranked message, stopped. changed oil, checked spark plug, and installed a new battery, still getting overcranking message, any suggestions.

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  • Generac Master
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Contact generac

Posted on Jul 20, 2018

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Posted on Jan 02, 2017

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SOURCE: my generac 15kw generator went

It could be either your start capacitor or the contactor-relay. Or you could try cleaning the contacts of the relay with an emery board to see if there is a change.

Posted on Sep 07, 2011

  • 2 Answers

SOURCE: how do i reset overcrank

You turn the unit to the off position, hit enter twice on control board, and put back in manual, this should reset this fault

Posted on Sep 08, 2011

startlight66
  • 80 Answers

SOURCE: generac 20,000kW Standby generator doesn't start shows message STOP ALARM OVERCRANKED

20,000KW is a big power standby generator. For generator that won'r start, the reasons may be various.
1. Air in the fuel system
2. Fuel Line Obstruction
3. Fuel Filter Clogging
4. The Handle Position of Fuel Injection Pump Is Not Correct
5. Fuel Injector Problem - Little fuel injection or fuel injection is not atomized
6. Oil Supply Problem - Oil transfer pump doesn't supply oil or the oil supply is brokenly.
1. Battery Power Shortage
2. Circuit Wiring Error or Poor Contact
More information at this Why Diesel Generator Fail to Start

Posted on Mar 24, 2018

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2 Answers

I have a natural gas generac 8kw it was running fine now it will not run found that out after the last power outage pull the plug looks good found that it will not spark at the plug


How old is it???? Does it have a read out that tells you what's wrong?????When is the last time you did a maintaince tune up on it???? Mine is fueled by propane and I changed the oil and plugs and it's been fine since....Sometimes it's the starter/ignition..I would do a complete tuneup first, then clear codes, then try starting it up manually....If that works put it back on auto..Good Luck

Mar 01, 2015 | Generac 13,000 Watt / 13,000 Watt Home...

1 Answer

How to replace battery in a generac standby 8kw generator


Switch generator to off. Remove 7.5A fuse. Disconnect Negative (-) battery terminal first and then Positive terminal (+). slide battery out the front (may be a tight fit) and install the new battery reversing removal steps. Connect (+) first and (-) last. Reinstall 7.5A fuse and switch to manual to start and test run.

Sep 06, 2013 | Generac Guardian 8kw Standby Generator

2 Answers

Generac 20,000kW Standby generator doesn't start shows message STOP ALARM OVERCRANKED


Overcrank means that it tried to start and couldn't. It will go through 5 crank cycles and then stop with this alarm. Switch to off, hit enter to clear fault and then try to start in manual. Check to make sure you have fuel and pressure is 11 to 14 in WC.

Jun 21, 2012 | Generac 13,000 Watt / 13,000 Watt Home...

8 Answers

Generac 43903 standby Generator overspeed indicator on starting


I have a generator that did the same thing. It would start and then stop within a few seconds. The more expensive generators have an oil level safety switch to prevent the engine from burning up. There is usually a wire connecting to the switch on the outside of the engine near the oil fill hole. Remove this wire and try to start the generator. If it runs without a problem then it is the switch. You need to remove the switch and take it apart carefully and clean it. There is a small float inside the assembly. When the oil runs low the float allows the switch to short to ground which kills the spark to the spark plug. Hope that helps.

Bob Janelli

I’m happy to help further over the phone at https://www.6ya.com/expert/bob_62dfa2f81bb55288

Oct 01, 2009 | Generac 13,000 Watt / 13,000 Watt Home...

2 Answers

Overcrank error message


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

Mar 31, 2009 | Kohler 12 kW Emergency Power System -...

1 Answer

Start runs shutsdown


Typically caused by the fuel line (LP or Natural Gas) having a lot of air in it. Was your generator just installed, or was there any work done to the gas line of the building / generator? Consult local gas contractor / propane dealer / gas company for assistance in purging the fuel line.

A low battery can also cause this as well as the generator is not able to come up to starting speed quick enough. Try placing a stand alone battery charger on the generator and charge the battery. Also check the air filter as well.

OverCrank condition occurs when generator tries to start itself, or be manually started, and the starter spends too much time turning.

This can also indicate failure of the control board. This will need the expertise of generac technician. Call 1-888-GENERAC (1-888-436-3722)
M-F 7am-6pm Central

Mar 29, 2009 | Generac 13,000 Watt / 13,000 Watt Home...

2 Answers

20KW Guardian Generac does not produce 12 volts to run engine


The problem is that the printed circuit board inside the generator draws a little current from the battery even when the generator is not running. Over the course of a few days this can make the battery weak enough to be unable to get recharged by the built in running charger which results in not enough power to run the electronic governor on the generator. Usually the spark plugs will work even with a fairly low battery.

Most of the Generac generators come with a built in trickle charger that runs off of the transfer switch load terminals. If your built in charger isn't doing the job it's either broken or you have the wrong sort of battery installed in the generator.

Regards,
Carl

Jan 11, 2009 | Electrical Supplies

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