| Author | Message | ||
| Bob MacIsaac (Wildbob24)
Registered Member Username: Wildbob24 Post Number: 105 Registered: 5-2007 Posted From: 184.36.52.85  Rating: N/A |
Calling all Generator Gurus, I have an older Kohler genset, model # 12.5ccopy61. It has a Perkins engine and runs fine, but I have low output from the Gen. I am only seeing 5 volts measured between each output leg and ground. Any ideas what the problem might be and are there any sources for manuals and schematics. TIA, Bob | ||
| Tim Brandt (Timb)
Registered Member Username: Timb Post Number: 561 Registered: 10-2003 Posted From: 99.122.63.218  Rating: N/A |
I'm going to go out on a limb and say it has lost it's field and needs to be reenrgized. I remember seeing it done once with a 12 volt jumper wire but I'm sure someone else here can give the details | ||
| Sean Welsh (Sean)
Registered Member Username: Sean Post Number: 1146 Registered: 1-2003 Posted From: 67.142.130.37  Rating: N/A |
Did this happen suddenly, after the generator was working normally? Or has it been sitting, unused, for a while? If it has been sitting I am going to agree with Tim and say you need to "flash the field." Instructions for flashing the field are often marked on the wiring diagram affixed to the inside of the enclosure. It involves bringing the unit up to rated RPM, then briefly applying +12vdc to the positive lead of the exciter winding and then immediately applying as much of a full load as you can to the unit. Let us know if you need further. -Sean http://OurOdyssey.BlogSpot.com | ||
| Luvrbus (Luvrbus)
Registered Member Username: Luvrbus Post Number: 923 Registered: 8-2006 Posted From: 74.32.80.29 Rating: N/A |
Bob, email Dreamscape he has that generator in his Eagle and I believe he has the manuals,sounds to me like the regulator went bad,I don't think that is brushless model may be a holder stuck. | ||
| Bob MacIsaac (Wildbob24)
Registered Member Username: Wildbob24 Post Number: 106 Registered: 5-2007 Posted From: 74.176.77.180 Rating: N/A |
Thanks for the replies. Yes, it has been sitting for a while so maybe that's all it needs. The problem is there is no diagram affixed to the inside of the enclosure. Thus, I have no idea which lead is the + to the exciter. There are 5 wires running from the Generator head: 3 large ones (2 awg ?) and 2 small ones (14awg). The 3 large ones, of course, are the ground and 2 main output lines. The 2 smaller ones connect to a junction block and then to a large relay device which I presume is the voltage regulator. Is there any way to tell which of these is the + wire to the exciter? I'll give Dreamscape a "shout". A manual would be nice. Bob | ||
| Bob MacIsaac (Wildbob24)
Registered Member Username: Wildbob24 Post Number: 107 Registered: 5-2007 Posted From: 98.92.169.36 Rating: N/A |
Some luck from Dreamscape. His generator is actually an Onan, but he did have some printed instructions for flashing a generator. Now I just need to determine which wire is the + lead to the field. I'll keep searching. Thanks for the help. Bob | ||
| Sean Welsh (Sean)
Registered Member Username: Sean Post Number: 1147 Registered: 1-2003 Posted From: 72.171.0.146 Rating: N/A |
Bob, The wiring diagram for that unit should be available from Kohler. It is drawing number 259498. -Sean http://OurOdyssey.BlogSpot.com | ||
| Bob Wies (Ncbob)
Registered Member Username: Ncbob Post Number: 271 Registered: 2-2006 Posted From: 64.85.179.73 Rating: |
I have the same generator and it's a great unit. It has a voltage regulator for the generator end which should should have 3 leads going to it. Generally speaking the two outside leads are the 120V sensing leads and the center is the lead which sends the excitation (12V) to energize the stator. Be careful about flashing the unit up. If you reverse the polarity on the excitation leads you'll reverse the patth for the voltage regulator. I'll look and see if I have a schematic for the unit but the question in my mind is: would you understand it if I sent it? Sometimes it's best to get a tech. We aren't like firemen..we can't fix everything we can't understand. NCbob | ||
| Bob MacIsaac (Wildbob24)
Registered Member Username: Wildbob24 Post Number: 110 Registered: 5-2007 Posted From: 184.36.50.73 Rating: N/A |
Bob, A schematic would be most helpful. While I'm certainly not on Sean's level, I've got a pretty good handle on electrical repairs. I can usually decipher schematics fairly well. Unfortunately, Kohler was of no help. I did find some info at the Wanderlodge Owner's Group. Apparently this genset was used extensively by Bluebird in the '80s. If you can find that schematic, send it on. BTW, how's that transmission doing? Thanks, Bob (Message edited by wildbob24 on August 24, 2010) |
