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Old 12-29-2013, 02:03 PM   #1
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Troubleshoot Generator ONAN BGE

My generator on my 1988 HR Alumalite is an ONAN Emerald Lite 4K BGE. It cranks and runs fine but it has all of a sudden started putting out too much voltage. When I turn on an inside light they are super bright and it blew a bulb. I checked voltage at the panel where the fuses are mounted and I read 12.72** volts. Does that mean the regulator is bad?
Thanks,
Zoom45

Voltage reading changed from 23**
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Old 12-29-2013, 02:27 PM   #2
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Quote:
Originally Posted by Zoom45 View Post
My generator on my 1988 HR Alumalite is an ONAN Emerald Lite 4K BGE. It cranks and runs fine but it has all of a sudden started putting out too much voltage. When I turn on an inside light they are super bright and it blew a bulb. I checked voltage at the panel where the fuses are mounted and I read 23 volts. Does that mean the regulator is bad?
Thanks,
Zoom45
Zoom45
Are you saying your DC voltage is 23V?
When I had a "high generator voltage" problem on my coach it did not affect the 12VDC electrical system.

My "high generator AC voltage", (140V+), was caused by "sticking" generator linkage, (which caused my Onan 6.3 kw BGE to run too fast).
Cleaning and lubricating the linkage with WD-40 cured the problem.

BTW, Flight Systems has an excellent generator trouble shooting pdf online.
Here's a link:
http://www.google.com/url?sa=t&rct=j...58187178,d.aWc

Mel
'96 Safari
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Old 12-29-2013, 02:37 PM   #3
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What does voltage read at same place with generator off?
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Old 12-29-2013, 05:26 PM   #4
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Using an A/C voltmeter, crank the RPM down until you get a bit closer to 120 VAC; and then use a Kill-a-Watt meter to adjust the no-load rpm to about 62/63 Hz.

Kill-A-Watt Electricity Monitor-P4400 at The Home Depot
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Old 12-30-2013, 06:22 AM   #5
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Yes DC volts was 23 at the fuse panel. I haven't checked the ac yet. The engine does sound like it runs pretty fast.
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Old 12-30-2013, 06:24 AM   #6
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I checked it with the shore power connected and generator not running and the reading was 12.72 at the fuse panel.
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Old 01-13-2014, 02:01 PM   #7
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Found my problem. It was too much rpms. It was reading 186 ac and 23 dc and 90.86 HZ. I found the idle speed screw was screwed down too much and had the rpms real high. I backed it off and got the ac to 122-125, the dc is 12.72 and the HZ was 60. The governor adjusting nut was about 1/4" from the end and loose. I can't tell any difference adjusting it. Does that only affect the max speed?
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Old 01-14-2014, 12:45 PM   #8
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Troubleshoot Generator ONAN BGE

You don't want to use the idle speed screw for setting engine RPM. You need to adjust the governor for proper voltage. That nut on the governor arm is the point of adjustment. Back out your idle speed screw until you are at 50 Hz at no load. With no load on the genset adjust the governor nut until you read 62-63 Hz. There should also be a governor sensitivity adjustment that you adjust to keep droop, the voltage drop when load is applied to within 2 - 4 Hz. After you have adjustments made, with a full load on the genset adjust your idle mixture screw under the fuel bowl in until the Hz starts to drop and then back out until Hz starts to drop again. Adjust until you find the highest setting and then turn the idle mixture screw out 1/4 turn.

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