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Onan 4000 not charging battery - Onan Electrical Supplies

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  • Onan Expert
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Some Onan 4KW do not have auxiliary battery charge windings and rectifier. Are you sure you have one? If not you will need and external charger

Posted on Feb 19, 2015

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Posted on Jan 02, 2017

erickg
  • 116 Answers

SOURCE: Oil type for Onan 4000 generator

SAE 15W-40 is what i used to use
synthetic? not sure about that one there may be oil pres switch that could give you a problem.

Posted on Apr 17, 2009

mamicheddy
  • 79 Answers

SOURCE: ONAN 4000 RUNS FOR ONE HOUR AND DIES--ANY IDEAS WHY?

Try to restart to see what happens. However, make sure to have a volt meter to check output voltage. You may be loosing voltage and therefore it shuts down. Check oil pressure switch, rings, brushes. Replace brushes if they are less than 1/2" short and clean rings with emory cloth until copper is noticable.

Posted on May 10, 2009

  • 691 Answers

SOURCE: Onan 4000 generator will not start. Charged

check the oil pressure switch, if it does not register it will also give a code and will not start.

Posted on Jul 17, 2009

  • 77 Answers

SOURCE: onan 4000 start good runs only ten minutsand shuts down,starts up

First locate the oil pressure switch and see if you can bypass it,then see if it runs. If not check the fuel filter and fuel pump,make sure solonoid for fuel pump is kicking on.

Posted on Aug 10, 2009

  • 6 Answers

SOURCE: Onan MicroQuiet 4000 Generator

Remove the air cleaner and inside near the throat of the carb is two bolts holding the carb to the intake remove these. Unhook the fuel line and twist the carb to allow the linkages to remove.

Posted on Sep 28, 2009

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1 Answer

Onan 4000 won't turn over


check for bad battery, loose terminals ,dirty terminals , faulty starter relay
if it is not starting check for oil level is correct ( low oil level sensor turns off ), diesel -air in system

Jun 11, 2016 | Onan Microquiet 3600 & 4000 Generator

1 Answer

How to get gas to the inside of my carburetor on an older onan genset 4000


Could be or the fuel pump gummed up. Pull off fuel line to carb, unplug fuel pump and conenct direct to battery, see if fuel comes out the line (catch in a container) make sure when you conenct to battery no sparks near the open fuel line. If no fuel replace pump, if fuel pull car apart

Sep 30, 2014 | Watts Onan Portable Generator - 4000 ,...

1 Answer

My generator runs fine but puts out no voltage and I checked fuse it's fine?


In what position is the switch under the voltmeter and does it read some voltage, may be very low? 
Is the main switch in run position?
Is there a charged battery connected to it?

Jun 05, 2010 | Watts Onan Portable Generator - 4000 ,...

1 Answer

The onan generator will not start 4000 KY----looks


If it is clicking it may not be bad, Sight unseen. Your problem is a low battery.

R/
David

Jan 04, 2010 | Watts Onan Portable Generator - 4000 ,...

2 Answers

Onan MicroQuiet 4000 Generator


Remove the air cleaner and inside near the throat of the carb is two bolts holding the carb to the intake remove these. Unhook the fuel line and twist the carb to allow the linkages to remove.

Sep 14, 2009 | Watts Onan Portable Generator - 4000 ,...

1 Answer

Onan genset worked fine a week ago


is it an electric start?...if so check battery and/or look for loose battery cable..Ground?...vibration during use could have loosened the cables...the make ready people sometimes do not tighten properly

Jul 21, 2009 | Watts Onan Portable Generator - 4000 ,...

1 Answer

Onan 4000 start good runs only ten minutsand shuts down,starts up


First locate the oil pressure switch and see if you can bypass it,then see if it runs. If not check the fuel filter and fuel pump,make sure solonoid for fuel pump is kicking on.

Jun 07, 2009 | Watts Onan Portable Generator - 4000 ,...

1 Answer

Oil type for Onan 4000 generator


SAE 15W-40 is what i used to use
synthetic? not sure about that one there may be oil pres switch that could give you a problem.

Apr 04, 2009 | Watts Onan Portable Generator - 4000 ,...

1 Answer

ONAN 4000 RUNS FOR ONE HOUR AND DIES--ANY IDEAS WHY?


Try to restart to see what happens. However, make sure to have a volt meter to check output voltage. You may be loosing voltage and therefore it shuts down. Check oil pressure switch, rings, brushes. Replace brushes if they are less than 1/2" short and clean rings with emory cloth until copper is noticable.

Jan 21, 2009 | Watts Onan Portable Generator - 4000 ,...

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