| Onan 6kw debugging, was replacing Onan [message #212740] |
Sat, 29 June 2013 13:20  |
Mike Teets
Messages: 299
Registered: January 2004
Location: Dublin, OH
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Previous symptom was that it produced 70 volts instead of 120. Replaced the bridge rectifier. Same symptom. Left the geni running for a bit checking effect of engine speed on voltage. Then the voltage dropped to zero... or actually 0.5 volts. Removed the rectifier and tested with multimeter with diode tester. Still good.
Page 40 of the maintenance manual says I should see 38 ohms between F1 and F2... I see 0. Does this mean a short inside the windings or is that test only valid with the armature removed?
Time for yard work so stopped messing for now.
Mike
Dublin, OH
Mike, GMCing since 2002
77 Palm Beach, 260, 403
Dublin, OH
http://teamteets.com/gmc/
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| Re: [GMCnet] Onan 6kw debugging, was replacing Onan [message #212741 is a reply to message #212740] |
Sat, 29 June 2013 13:39  |
Jim Miller
Messages: 501
Registered: March 2008
Karma: 10
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On Jun 29, 2013, at 2:20 PM, Mike Teets wrote:
> Page 40 of the maintenance manual says I should see 38 ohms between F1 and F2... I see 0. Does this mean a short inside the windings or is that test only valid with the armature removed?
Are you sure its 0 ohms and not infinity?
--Jim Miller
1977 Eleganza II
1977 Royale
Hamilton, OH
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Jim Miller
1977 Eleganza II
1977 Royale
Hamilton, OH
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| Re: [GMCnet] Onan 6kw debugging, was replacing Onan [message #212744 is a reply to message #212741] |
Sat, 29 June 2013 13:53 |
Mike Teets
Messages: 299
Registered: January 2004
Location: Dublin, OH
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Not sure... new meter to me. It reads 0 on the digital readout. Same as if I touch the probes together.
| Quote: |
On Jun 29, 2013, at 2:20 PM, Mike Teets wrote:
> Page 40 of the maintenance manual says I should see 38 ohms between F1 and F2... I see 0. Does this mean a short inside the windings or is that test only valid with the armature removed?
Are you sure its 0 ohms and not infinity?
--Jim Miller
1977 Eleganza II
1977 Royale
Hamilton, OH
|
Mike, GMCing since 2002
77 Palm Beach, 260, 403
Dublin, OH
http://teamteets.com/gmc/
[Updated on: Sat, 29 June 2013 13:53] Report message to a moderator |
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| Re: [GMCnet] Onan 6kw debugging, was replacing Onan [message #212745 is a reply to message #212744] |
Sat, 29 June 2013 14:03 |
Jim Miller
Messages: 501
Registered: March 2008
Karma: 10
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On Jun 29, 2013, at 2:53 PM, Mike Teets wrote:
> No sure... new meter to me. It reads 0 on the digital readout. Same as if I touch the probes together.
That's 0. Indicates a dead short in the field winding which seems very, very unlikely. Are you doing this with F1 and F2 still attached to the bridge? They need to be disconnected to do the test.
--Jim Miller
1977 Eleganza II
1977 Royale
Hamilton, OH
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Jim Miller
1977 Eleganza II
1977 Royale
Hamilton, OH
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| Re: [GMCnet] Onan 6kw debugging, was replacing Onan [message #212747 is a reply to message #212745] |
Sat, 29 June 2013 14:20 |
Mike Teets
Messages: 299
Registered: January 2004
Location: Dublin, OH
Karma: 0
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Senior Member |
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Bridge disconnected. Tested across the plastic bridge connector wires.
| Quote: |
> No sure... new meter to me. It reads 0 on the digital readout. Same as if I touch the probes together.
That's 0. Indicates a dead short in the field winding which seems very, very unlikely. Are you doing this with F1 and F2 still attached to the bridge? They need to be disconnected to do the test.
--Jim Miller
1977 Eleganza II
1977 Royale
Hamilton, OH
|
Mike, GMCing since 2002
77 Palm Beach, 260, 403
Dublin, OH
http://teamteets.com/gmc/
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| Re: [GMCnet] Onan 6kw debugging, was replacing Onan [message #212774 is a reply to message #212747] |
Sat, 29 June 2013 19:00 |
Mike Teets
Messages: 299
Registered: January 2004
Location: Dublin, OH
Karma: 0
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Senior Member |
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I am going to get engine hoist from my father tomorrow and pull the generator so I can clean things up and see what is going on. There is a lot of gunk and grime inside the area. Could be that is causing the shorting.
| Quote: |
Bridge disconnected. Tested across the plastic bridge connector wires.
Quote:
> No sure... new meter to me. It reads 0 on the digital readout. Same as if I touch the probes together.
That's 0. Indicates a dead short in the field winding which seems very, very unlikely. Are you doing this with F1 and F2 still attached to the bridge? They need to be disconnected to do the test.
--Jim Miller
1977 Eleganza II
1977 Royale
Hamilton, OH
|
Mike, GMCing since 2002
77 Palm Beach, 260, 403
Dublin, OH
http://teamteets.com/gmc/
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