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Old 10-26-2006, 01:27 AM   #1
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My 12.5kw Onan goes through the pre-start "clicking" routine but then nothing else and I get a code #32 indicating low battery. A check shows 13.6VDC at the terminals.
Any ideas?
Thanks,
John, 2005 4502 Essex, now in Chattanooa
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Old 10-26-2006, 01:27 AM   #2
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My 12.5kw Onan goes through the pre-start "clicking" routine but then nothing else and I get a code #32 indicating low battery. A check shows 13.6VDC at the terminals.
Any ideas?
Thanks,
John, 2005 4502 Essex, now in Chattanooa
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Old 10-26-2006, 03:11 AM   #3
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When you say the voltage check shows 13.6VDC at the terminals, are you referring to the battery's terminals? Check the voltage at the stud on the generator starter or generator starter relay, whichever your generator has. The voltage may be fine at the cable end of the wire coming from the main battery but due to corrosion, or a loose connection the generator may see something less. Do this check with a meter while someone trys to start the generator. Or just tighten the connector and see if it starts. It could also be a loose connection anywhere the main wire has a connection, i.e. not just at the generator but where ever this wire comes from.
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Old 10-26-2006, 05:28 AM   #4
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Bob's suggestion of checking at the generator starter is a good idea. Also, try checking the battery voltage at the starter stud while trying to start the generator.

Bad connections often read full voltage until a current load is applied. The current causes the voltage to drop across the resistance of the bad connection.
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Old 10-26-2006, 07:58 AM   #5
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<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by racer0624:
My 12.5kw Onan goes through the pre-start "clicking" routine but then nothing else and I get a code #32 indicating low battery. A check shows 13.6VDC at the terminals.
Any ideas?
Thanks,
John, 2005 4502 Essex, now in Chattanooa </div></BLOCKQUOTE>

Try flicking the battery bypass switch a few times. Sometimes the contacts get carboned up and don't make a good connection. I was jump starting my genny on one trip until I figured this out. Had the contacts repaced when I got back.
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Old 10-26-2006, 09:21 AM   #6
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Check your ground posts both at batteries and on frame from both Gen and batt.
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Old 10-26-2006, 10:10 AM   #7
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First things first: either measure the terminal voltage while you crank the generator or schlepp the battery to the nearest AdvancedO'Reilly'sAutoZoneCarQuest (they're all along Hwy 98) and have it tested there.
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Old 10-27-2006, 01:46 AM   #8
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Thanks for the suggestions. I've tried to start the unit from both the dash and remote switches and neither get it started. I also found 13.6VDC on the Onan battery terminals while my wife tried to start it.
When it stops raining I'll try jump starting it off my car battery.

John, 4502 Essex in Chattanooga heading to the Moonshine Festival this weekend.
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Old 10-27-2006, 06:39 AM   #9
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If you have a battery charger that has a start position, try connecting that to the generator to see if the generator still gives you the same code. I know that a bad coach battery did stop my Onan from starting and was tested the way I suggested by a dealer.
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Old 10-27-2006, 10:11 AM   #10
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About a month ago I tried starting my Onan and it would not start. It turned out that the manufacturer did not leave any slack in the battery cable and it cracked at the post on the Onan positive post. I went and bought a 6 inch battery wire and replaced the bad end of the old battery cable and put a bolt and nut to attach old cable to new 6 inch cable then attached the new end to the Onan generator. This gives enough slak that when the Onan runs it wont yank the battery cable loose.
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Old 10-27-2006, 10:57 AM   #11
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It wouldn't jump start either. The weather's lousy, I've given up and made an appointment with Cummins South in Atlanta early next week. I'll report the findings. Thanks again for all the suggestions.

John, 2005 4502 Essex now in Calhoun, Ga.
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Old 10-28-2006, 05:24 AM   #12
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you guys are referring to the "Onan battery". Exactly what battery(ies) powers the Onan starter? Coach, house or other?
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Old 10-28-2006, 11:13 AM   #13
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usually generators are wired to start off the house battery bank. If they are too low then the battery boost switch can be activated to connnect it to the chassis battery as well.
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