Bobby V
I have an older 4390 generac and I did not notice it cycle this Sunday. Went out today to find an over crank light on. I tried to start in manually and after about the third attempt it fired up. Well I wanted to reset to timer and I put it back into auto mode and it would not fire up just crank for about a second. Tried the manual mode again and it will not start any longer just crank for a second and then nothing. does this about 8 times so I just flipped it to the off position. I have a good battery 14.2 volts.I have the manual, but do not see any troubleshooting for a over crank light.
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johnc
Bob: You have to do alot or reading between the lines for overcrank. Go to check stator output in the manual. You need a good vom meter. If the ohm readings are close, should be ok. If you find one reading way off, probably bad stator. Page 39, test 7 thru 10 is a good start. Hopefully all readings are good, if so any other repair should be rather cheap.
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scoot
Check the resistance between 0-and 4 from the brushes. Might have to clean the slip rings and change the brushes.
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d11gnccer
Slip rings and wires 0 and 4 only have to do with the power output. If the engine is not starting at all then another problem is to blame.
Edit: I might have jumped to conclusion after reading the post. Does the generator go through its full crank cycles before showing the overcrank light. like 15 seconds on so many seconds off then back on again?
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Bobby V
Yes
The engine tries to start for about a second then does nothing. does this about 15 times then gives the over crank light. I had knee surgery last week so I have not had a chance to do any testing as I can not bend down. Lucky for me it is not hurricane season, yet!!!! Any help would be appreciated. I am going to hook up battery charger the next time I go out to make sure battery is giving the proper boost at start up.
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johnc
Can't recall any other post of this problem, where only 1 second crank then nothing. Certainly sounds electrical. If fuel were the problem, it would crank at least for several seconds before a fault code. Something stopping power from getting to the starter? Can you turn the flywheel?
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Bobby V
I had not had a chance to really check anything because I recently had knee surgery. I think I will get to it this week. I just tried it again yesterday and it would not even attempt to start so I think I am looking at a bad battery. It says 12.7 while it is sitting there so I will have to try a boost start.
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hoghead
make sure there is water in the batt.
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Hotwire
Bobby, sounds like a problem I had with a 25 kw starter. When I put the switch to manual, it would "click" the soleniod, then the starter would barely move and then nothing. Put switch to off, then back to manual, and "click" nothing again. Good voltage, no corrosion on terminals of battery. Pulled off the starter and bench tested it and found the starter was bad. Pulled starter apart and cleaned all the contacts and now is working fine. check your starter, jump it with jumper cables to see if you can make it roll over.
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