Question about Electrical Supplies

1 Answer

Engine overspeed light blinking

I see the light, what do I do about it? Generator won't even attempt to crank. Battery is good. Just changed the oil and coolant.

Posted by on

  • nickzick Mar 09, 2009

    Hey there. I have the same problem, although overspeed light is not blinking, just lights up when engine tries to start up.

    It's a Perkins 4008TAG2 engine of an ABB genset. Any ideas?

  • Anonymous May 18, 2009

    I have a 15kw Kohler gerator with an overspeed light on continously and have not a clue how to get it off. Any help appreciated.



1 Answer

  • Level 2:

    An expert who has achieved level 2 by getting 100 points


    An expert that got 10 achievements.


    An expert that got 5 achievements.

    Vice President:

    An expert whose answer got voted for 100 times.

  • Expert
  • 169 Answers

Hi there,
You probably have a broken magnetic pickup.
You'll have to reset the generator controller, usually this is just a matter of turning the switch of the off position. On most of the generators I've worked on a blinking overspeed light as opposed to a solid one means that the control board can't detect any speed input. Speed input can be either a wire that comes from the generator output, or a magnetic pickup mounted so that it can count flywheel teeth. You don't say which generator this is so I can't guess any better than that.

Posted on Feb 23, 2009


1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

A 6ya expert can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
The service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
Good luck!

Posted on Jan 02, 2017


Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

Onan 5500 marque gold turns over but, won't start. fault code is 32 but, batteries ok, air cleaner ok, fuel pumping, oil changed, won't start

Code 32 is a low cranking speed sense. You didn't mention a Spec # which would help. You say batteries are ok, but the generator is not getting enough cranking amps or voltage to maintain the control properly. Check, battery voltage, wiring, any in line isolation solenoids, check generator solenoid, also make sure there is no mechanical binding on the generator, a good way to do that is remove the spark plugs DISCONNECT THE BATTERY to prevent starting, underneath where the air intake is under the alternator is a plastic plug, remove that and you can put a socket I believe 3/4" up onto the alternator shaft and rotate the engine, if it tuns freely there is no binding, if you feel it is hard to move, check the drive train, belts, pulleys underneath (A lot of work, best to take to a dealer if it is mechanically bound)

Sep 13, 2012 | Onan Marquis Gold Quiet Gas Generator 5500...

1 Answer

How to fix the problem of overspeed on desiel generator

Check the mag pickup speend sensor that is screwed in where the flywheel bolts tot he alternator. Sometimes they can pick up chips etc. Unscrew wipe off, screw all the way back in by hand slowly until it makes contact with the flywheel teeth. Then back out 1 turn. Check voltage on sensor wires during cranking, it shoupld be approx 2V AC. If not replace sensor.

Aug 27, 2012 | Taylor Mobile Generator Set 80 kW, 480...

1 Answer

New generator won't start

remove the spark plugs ( if this is a petrol engine ) and crank the engine antill the oil from the plug hole stops coming out make sure the plugs are totally dry from oil before refitting . if diesel engine remove injectors crank engine antill dry from oil

Dec 23, 2017 | Homelite Electrical Supplies

1 Answer

My 18RESL Kohler Propane Generator ran for 8.5 hours and shut down for overspeed. later it started up again and shut down for under frequency. Now it won't even turn over. Where do I start. I checked...

You have to reset it because it locked out on on under frequency. Just pullout the fuse on the control panel and then reinstall it a couple of seconds later. Now it will reset the fault codes. Hope that helps.

Dec 02, 2010 | Kohler 12 kW Emergency Power System -...

1 Answer

Shuts off by itself used only 20 hrs and i did change oil as instructed and the oil is full I was told it may be low oil shut off switch was bad even if it is brand new unit

To be sure that the oil level switch is good or not, try the following:
  • Find the switch terminals;
  • First disconnect one wire (if more than one) and try to crank the motor;
  • If the previous attempt was not successful, connect the wires together (if two wires) or the wire to ground (if one wire). Try cranking again.
If one attempt was successful, then the sensor is bad or wrong connected.
 If no attempt was successful, then the sensor may be good. Than check the fuel supply system.

Jul 01, 2010 | Coleman Powermate Subaru 5000W Portable...

1 Answer

Briggs and straton 18k home generator cranks fine and runs for about 15 seconds and then immediately shuts down. It is hoodked into the house power panel and has worked perfectly for two years. It is on a...

If you're sure it isn't a fuel issue, also check these things:

The engine oil - it could be low on oil and shutting down on low oil pressure

If water cooled, check the coolant level. Same thing - the engine may have a low coolant sensor.

Make sure the unit isn't overloaded.

If it has overspeed control check to see if the engine is running unusually fast when it does run.

Mar 12, 2010 | Electronics - Others

7 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

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

3 Answers

2003 lesabre won,t crank, battery is good

Have you check to see if the ignition fuse is blown?

Sep 07, 2009 | 2003 Buick LeSabre

2 Answers

Generac Guardian 15 kw overspeed fault

Did you remember to set the overspeed shutdown threshold on the control board?

Apr 03, 2009 | Generac 13,000 Watt / 13,000 Watt Home...

Not finding what you are looking for?
Electrical Supplies Logo

Related Topics:

1,102 people viewed this question

Ask a Question

Usually answered in minutes!

Top Electrical Supplies Experts

Craig Butler
Craig Butler

Level 3 Expert

1723 Answers


Level 3 Expert

3289 Answers

Gene Haynes

Level 3 Expert

5245 Answers

Are you an Electrical Supply Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides