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Generators In this forum we will try to answer any of your questions about the different model generators that can be found on Blue Bird coach's.

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  #11  
Old 05-30-2011
john wheeler john wheeler is offline
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Tom
you are right it is 11 pin.

Guardian Electric
cont 12a res 240ac
1510 series
coil 120v 50-60hz
a410-366186-151
The one you linked in Grainger looks to be the same but now I'm not sure what the problem is with no ac power?
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  #12  
Old 05-30-2011
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Quote:
Originally Posted by john wheeler View Post

Tom
you are right it is 11 pin.

Guardian Electric
cont 12a res 240ac
1510 series
coil 120v 50-60hz
a410-366186-151
The one you linked in Grainger looks to be the same but now I'm not sure what the problem is with no ac power?
Hi TOM......I mean John

Broken brushes, broken brush wires and worn slip rings are fairly common on these generators.

As mentioned before if the generator does not put out AC voltage the engine won't keep running. On my 84 ½ PT-36 with the Kohler/Perkins 12.5 kW generator I had a brush wire break because of a worn slip ring (egg shaped). I repaired the slip ring and replaced the brushes.

The brushes and slip rings were inside the cover on the end of the generator that was back under the bus. As usual be very careful when working under the bus and behind the generator!
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Last edited by Dieselbird01; 05-30-2011 at 12:12 PM. Reason: spelling
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  #13  
Old 05-30-2011
john wheeler john wheeler is offline
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John
That was good, sorry about that my tiny brain is overloaded right now. I bet i stared at that for five minutes thinking now why would he do that.
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  #14  
Old 05-30-2011
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I agree with John. Take a real good look at those brushes, small wires to the brushes and the condition of the slip rings. I actually replaced a brush once only to have the wire break again, before I realized the slip ring was egg shaped! I know of at least 4 other coaches that have had the uneven worn slip ring problem!
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Westchester Sandblast
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  #15  
Old 05-30-2011
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I too have had the out of round slip rings and broken brushes. The 8 amp fuse you asked about is an inline fuse and just looks like a black wire with a bulge in it.
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  #16  
Old 05-30-2011
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John,

The fuse may be located just below the regulator. It's been a while since I had to replace it. The original fuse was coated in brown paper. I replace with a 10amp glass fuse. I don't think 8 amp glass fuses are easily available.

Bill
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  #17  
Old 06-01-2011
john wheeler john wheeler is offline
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I found and replaced the 8amp fuse on back, started genny and still will not stay running but now the volt meter in the bus is pegged. If i switch to shore power it reads 123 volts. I pulled the back of genny off, brushes and slip rings look new and cannot find any bad wires. I removed and bench tested the coil relay with 120 and it seemed to work fine as far as actuating the contacts. Removed and tested the 4 wire harness from control box to regulator seems good. anything else i should check or do before putting back plate on?

MAN IS THIS GETTING OLD.
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  #18  
Old 06-01-2011
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John,I have never worked on the Kohler with a Yanmar engine,just the Kohler with the Perkins engine.
I'm guessing they are the same except for the engines.
If the thing is making power and the power is going into the 11 pin ice cube and if the ice cube is working it should allow 12vdc power to go to the fuel solenoid.

So,taking it one step at a time.
Tie the fuel solenoid so the engine runs,then check AC voltage at the ice cube relay.
Then check to see if you have 12VDC going to the ice cube,and with the genny running check to see if the 12VDC is going through the ice cube.

I had a weird problem like this a few months ago,someone else had worked on it and a wire or 2 were in the wrong places.
I had to trace every wire to figure it out,usinf the drawings from here on WOG (thanks guys!).

The advantage you have is nobody else has been working on it.

Stop and think about how it works.
When you start the engine the starter solenoid sends power to the fuel solenoid.
When the genny starts and is making power the ice cube relay is engaged and 12vdc power goes through it to the fuel solenoid.
Thats what keeps it running.
The ice cube may do other stuff,i never looked,all i needed was to keep my engine running,as do you.

So,the engine will run,and it makes AC voltage.
If the AC gets to the ice cube and makes the relay that part is OK.
Now you need to check to see if 12VDC is getting to the ice cube.
And if the 12VDC is going through the ice cube when the engines running.

I don't remember where the 12VDC comes from that goes to the ice cube.

Wheres Tom Warner?
I bet he knows!

ALSO,WE LEFT OUT THE CIRCUIT WHERE THE ENGINE SAFETY STUFF CAN SHUT THE ENGINE DOWN.
Maybe thats the problem?
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  #19  
Old 06-09-2011
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If I knew what the ice cube was I could tell you what the problem is???

Actually I am about to go to the macy fergusen dealer to pick up a new solenoid. That is what is wrong with my perkins.

Actually the control box controls everything (I guess that makes sense doesnt it>) except the control coming from the S terminal of the solenoid what the starter starts turning over, and that signal pulls in the fuel solenoid to allow fuel into the injector pump to start the engine. At that point considering that the low oil sensor puts out the correct signal to the control box and the high temp senser does the same thing (the two sensers are connected in parallel), the engine starts and at that point if the generator puts out 240VAC the control box senses it and keeps running.
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  #20  
Old 06-09-2011
john wheeler john wheeler is offline
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The best i could find was that now i was only getting 3 volts ac to the "ice cube" or coil relay. The bird currently resides at Valley Power Systems in Fresno, not looking forward to the bill. I will post results when i get it back. Thank you to every one that tried to help me
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