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Old 06-22-2021, 08:53 AM   #1
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Question Onan Gen not getting 12v

2003 Minnie Winnie
Onan generator had fuel pump changed and a few other things.
We disconnected the 12V to start the project, and it was getting power before we started.
Now no power! Batteries are new and 13+ volts. What could have happened?
Is there possibly a switch somewhere that went out? Something like related to parking brake being set to operate the slides?
I am at a loss. It appears everything in coach that is 12V is fine.
Appreciate any help.
Charmon
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Old 06-22-2021, 09:31 AM   #2
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Some have a seperate generator cable. Look around the batteries for one laying loose, or on the negetive post.

There will Also be a circuit breaker near the batteries on the generator cable. Some have a button to switch off and a little lever to reset. Just bumping into the button can switch them off.
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Old 06-22-2021, 09:42 AM   #3
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Quote:
Originally Posted by twinboat View Post
Some have a separate generator cable. Look around the batteries for one laying loose, or on the negative post.

There will Also be a circuit breaker near the batteries on the generator cable. Some have a button to switch off and a little lever to reset. Just bumping into the button can switch them off.


Follow the positive cable from the battery, a circuit breaker should be within the first 3' .
Might look like this .
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Old 06-22-2021, 10:44 PM   #4
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There are generally 3 or 4 (12vdc) circuit breakers within 18-inches of the coach battery, and one of these goes to the GEN Starter circuit; find it and attempt reset? Mine under step w/ battery, beside the battery switch
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Old 06-22-2021, 11:24 PM   #5
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Lots of speculation about extra breakers, extra cables, etc., but none correct. This is wired just like my '07 View was wired.

Power to the generator comes off the battery relay in the relay box in the inboard of the forward RH storage compartment forward of the steps. The battery charge relay (silver) and the battery relay itself (black) are located behind the white button circuit breakers.

https://www.winnebago.com/Files/File...ire_142755.pdf

There are three different Minnie Winnie models that year, but this wiring will all be the same, I picked the Model 427P. If you go to page 5 of the link you will see the two relays the wire to the generator is the Green taped wire on the far right. This same terminal supplies current to the 40 amp breaker in the panel covering it, which supplies the 12 volt fuse panel inside the coach. If you have 12 v at the fuse panel in the coach, you have 12 volt at the generator. Did you have the generator out of the coach? did you have cables at the genny disconnected?

Charles
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Old 06-24-2021, 08:04 PM   #6
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Battery Switch or 12v Circuit Breaker near Battery? Mine (I think) has 100a, 60a, 40A AND 25 beakers in battery compartment, believe 100A= GEN, 60aA= Slides, 40a= Converter/ distribution and 25a= Steps
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Old 06-25-2021, 10:30 AM   #7
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UPDATE

[QUOTE=Charmon2233;5801373]2003 Minnie Winnie
Onan generator had fuel pump changed and a few other things.
We disconnected the 12V to start the project, and it was getting power before we started.
Now no power! Batteries are new and 13+ volts. What could have happened?
Is there possibly a switch somewhere that went out? Something like related to parking brake being set to operate the slides?
I am at a loss.
Appreciate any help.


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UPDATE: I do have 12V at my fuse panel. I found this in a compartment to the right of my coach batteries. I don't see anything labeled generator. Could it be the black relay? And by the way how do I check all these, for future reference?
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Old 06-25-2021, 06:57 PM   #8
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There is also a circuit breaker ON the Generator. If tripped you can't start the unit. Look just below the ON/OFF switch ON the Generator.
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Old 06-26-2021, 01:05 AM   #9
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[QUOTE=Charmon2233;5805935]
Quote:
Originally Posted by Charmon2233 View Post
UPDATE: I do have 12V at my fuse panel. I found this in a compartment to the right of my coach batteries. I don't see anything labeled generator. Could it be the black relay? And by the way how do I check all these, for future reference?
Charmon
The black relay is the main battery relay that is operated by the "salesmans switch" at the coach door. The silver relay is the boost relay that operates every time the engine starts or any time you press the boost switch on the dash. This relay in particular is bad about the contacts burning up, and your batteries will not charge from the engine when that happens, replace it with a Cole-Hersee 24213. I guarantee it is bad. However it will not stop the generator from starting or cranking.

On the black relay, terminal opposite side from the silver relay, there should be a wire, probably black, with green tape wrapped around it, that is the power going to the generator.

Someone mentioned the white toggle circuit breaker on the generator itself. This is a 120v AC circuit breaker for the generator output and should not keep the genny from cranking. There is a fuse near it, 5 amp, that is the 12v control circuit fuse.

Generator does not crank over with the switch on the generator either????

Charles
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Old 06-26-2021, 08:27 PM   #10
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EDIT: I need to clarify, the black relay is a large one, hard mounted, located behind that row of circuit breakers. The one you have pulled out that has wires attached to it is most likely the Slide out relay, though the diagram linked to above shows it in the forward part of the box.

Charles
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Old 06-26-2021, 11:21 PM   #11
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Within 18" of coach battery, you will find a group of various 12vdc CIRCUIT BREAKERS; (one to Converter, 1 to GEN Starter, 1 to Boost, 1 to STEP?... This one to GEN is either tripped, or defective, I suspect.
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Old 06-29-2021, 08:29 PM   #12
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SWAG on your cube relay, is that it is used for SLIDEOUT safety circuits, such as Parking Brake, Seat Switch or Neutral or IGN Switch to prevent slide operation; if you have TWO slides, you may have Two cube relays. (Mine if IGN=ON, Slides= INOP LUCK
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Old 06-30-2021, 09:25 PM   #13
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Quote:
Originally Posted by Stevegd007 View Post
There is also a circuit breaker ON the Generator. If tripped you can't start the unit. Look just below the ON/OFF switch ON the Generator.
Sorry, but wrong, many complain NO Power w/ GEN running, then find Breaker on GEN tripped, but it is true that if GEN stops PRODUCING (SUCH AS BAD VOLTAGE REGULATOR) internally, the control relay on circuit board drop out and fuel pump shuts off. Hope this helps
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