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Onan Emerald 1 Genset Questions


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  #11  
Old 10-17-2017, 12:27:45 PM
Imlost Imlost is offline
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Default Re: Onan Emerald 1 Genset Questions

Model 4.0 BGE-1R-26101C, S/N H860 835287
As I get older my eyesight gets worse. LOL!

With the genset running I'm getting about 12.5v at the battery and a little over 14v at the ignition coil, so I'm guessing the unit doesn't really keep the battery charged. I'm probably going to wire up a battery maintainer/charger so that when the generator is running it will charge the battery.

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  #12  
Old 10-17-2017, 12:35:06 PM
len k len k is offline
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Default Re: Onan Emerald 1 Genset Questions

Something is wrong, should not be getting higher voltages at spark coil than at bat.

Maybe connections are dirty somewhere, test meter ?? fuse?? .......
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  #13  
Old 10-17-2017, 05:00:33 PM
Imlost Imlost is offline
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Default Re: Onan Emerald 1 Genset Questions

I've cleaned all the connections, new control board w/new fuse, test meters are pretty accurate: Fluke EC73III & Simpson 260.
The Spec plate line for DCV, amps & watts is unstamped (blank). Would that indicate no 12v charge capability?

Unit is low hrs, and doesn't appear to have had any previous owner "modifications". I've already taken all the sheetmetal off and removed all dirt dauber nests, removed the stator/housing to replace the bearing, cleaned/polished the slip rings & brush holder. Haven't seen any cut/spliced/non-factory crimped wires.
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  #14  
Old 10-17-2017, 05:38:12 PM
Kell1961 Kell1961 is offline
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Default Re: Onan Emerald 1 Genset Questions

The Onan emeralds do not have a charging circuit. They are designed to use the coach inverter to charge the house batteries. Some of the older units did have a charge circuit but to many of the OEM builders tried to use the genset charging curcuit to keep the house batteries up under DC loads. A small battery tender or a battery charging assembly off of a commercial mobile will work.
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  #15  
Old 10-17-2017, 05:43:40 PM
len k len k is offline
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Default Re: Onan Emerald 1 Genset Questions

BGE spec a-c SERVICE manual 965-0530 shows a simple bat charging circuit, resistor and single diode . pfd page 7
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  #16  
Old 10-17-2017, 05:51:49 PM
Imlost Imlost is offline
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Default Re: Onan Emerald 1 Genset Questions

OK. I guess I'll pull the resistor out tomorrow and make sure the connections on it are clean.
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  #17  
Old 10-17-2017, 06:26:50 PM
len k len k is offline
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Default Re: Onan Emerald 1 Genset Questions

If your seeing 14V at bat and it's real, not a meter problem, there has to be a charger somewhere. Bat only makes about 12.6-12.8 after it's been ~day or so after it's last been charged.
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  #18  
Old 10-17-2017, 06:37:50 PM
Imlost Imlost is offline
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Default Re: Onan Emerald 1 Genset Questions

With the engine running I'm seeing 12.5V at the battery and a little over 14V at the ignition coil.
So the generator is making 14V, it's just not getting back to the battery
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  #19  
Old 10-17-2017, 06:53:55 PM
len k len k is offline
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Default Re: Onan Emerald 1 Genset Questions

Something is wrong, doesn't sound like bat is being charged. Check that it's wired as per the schematic. Never know how the previous owner modified (screwed up) things.

Only other thing I can think of is charging is applied close to spark coil , and there is resistance between bat and spark coil , so meter is responding to peaks of AC sine wave.
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  #20  
Old 10-25-2017, 01:16:50 AM
Imlost Imlost is offline
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Default Re: Onan Emerald 1 Genset Questions

Couple of more questions.
1. I'm going to be mounting this unit on the deck of a flatbed truck. How high off the deck will it need to be for the cooling air exhaust to work properly without a cutout in the deck?

2. When mounting the unit do you mount it so that the top edge of the drip pan is level, or do you mount it so that the engine/generator is level?
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