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03-21-2020, 11:08 PM
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#1
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Junior Member
Brand: Thor Motor Coach
Model: 2017 Vegas 24.1
State: Texas
Posts: 16
THOR #14032
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Genset Voltage Output
Ongoing issue with running Onan Gen., model 4KYFA26100p, not providing enough Volts to engage transfer switch, no house power. Recently had RV into Cummins and they replaced control board with p/n 327-1413. Worked for a couple of weeks but now issue has returned.
How can I check generator voltage with multimeter? Regulator is part of the control board.
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03-21-2020, 11:28 PM
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#2
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Senior Member
Brand: Thor Motor Coach
Model: Hurricane 31S
State: Texas
Posts: 4,173
THOR #6411
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Quote:
Originally Posted by Rich9592
Ongoing issue with running Onan Gen., model 4KYFA26100p, not providing enough Volts to engage transfer switch, no house power. Recently had RV into Cummins and they replaced control board with p/n 327-1413. Worked for a couple of weeks but now issue has returned.
How can I check generator voltage with multimeter? Regulator is part of the control board.
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The easiest way is to pull the top of the transfer switch, set the volt meter to 120 to 240 volts AC, put the voltmeter probes into the electric cable lugs coming from the generator and then start the generator. Please be careful as 120 volts is enough to injure you badly. I would you tape the voltmeter leads to the terminals if you cannot wedge them in-place.
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Jim & Roy Davis
2016 Hurricane 31S
1961 Rampside in tow
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03-21-2020, 11:37 PM
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#3
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Senior Member
Brand: Thor Motor Coach
Model: Forest River Forester 235
State: Indiana
Posts: 4,884
THOR #6826
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You seem to be pursuing the solution to a specific problem. Good luck. I often suggest to my fellow campers the purchase of a Hughes voltmeter:
https://www.amazon.com/dp/B0195J4T2Q...osi&th=1&psc=1
I keep mine plugged into the bathroom outlet all the time. It tells me the interesting real time story of my shore power voltage as well as my generator. It also happens to be a perfectly dandy night lite. Well worth it’s $16 cost.
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03-21-2020, 11:41 PM
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#4
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Senior Member
Brand: Keystone
Model: Sprinter
State: Florida
Posts: 1,422
THOR #15553
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Quote:
Originally Posted by Beau388
The easiest way is to pull the top of the transfer switch, set the volt meter to 120 to 240 volts AC, put the voltmeter probes into the electric cable lugs coming from the generator and then start the generator. Please be careful as 120 volts is enough to injure you badly. I would you tape the voltmeter leads to the terminals if you cannot wedge them in-place.
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Unplug shore power first. Start the gen. No wedging. No tapeing. Set the meter to 200 volt AC scale. Hold a probe in each hand. Put one probe on the neutral (White wire) and leave it there. Move the other probe from one post to the other coming from the gen. Be sure breakers on the gen are on.
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2011 Keystone Sprinter 323BHS. Retired Master Electrician. All Motor Homes are RV's. All RV's are not Motor Homes.
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03-22-2020, 12:42 AM
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#5
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Junior Member
Brand: Thor Motor Coach
Model: 2017 Vegas 24.1
State: Texas
Posts: 16
THOR #14032
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Pulled top to transfer switch and taped meter probes to generator terminals. Surprisingly low volt reading, wonder if I’ve done something wrong. Is there way to test voltage using meter probes on Gen. control board?
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03-22-2020, 12:48 AM
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#6
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Junior Member
Brand: Thor Motor Coach
Model: 2017 Vegas 24.1
State: Texas
Posts: 16
THOR #14032
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Quote:
Originally Posted by cavie
Unplug shore power first. Start the gen. No wedging. No tapeing. Set the meter to 200 volt AC scale. Hold a probe in each hand. Put one probe on the neutral (White wire) and leave it there. Move the other probe from one post to the other coming from the gen. Be sure breakers on the gen are on.
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You reference "breakers" plural. I'm aware of only the Line Circuit Breaker to right side of control switch. Are there others?
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03-22-2020, 12:56 AM
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#7
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Senior Member
Brand: Keystone
Model: Sprinter
State: Florida
Posts: 1,422
THOR #15553
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Quote:
Originally Posted by Rich9592
You reference "breakers" plural. I'm aware of only the Line Circuit Breaker to right side of control switch. Are there others?
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some gens have 1 breaker. Some gens have 2.
__________________
2011 Keystone Sprinter 323BHS. Retired Master Electrician. All Motor Homes are RV's. All RV's are not Motor Homes.
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03-22-2020, 01:19 AM
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#8
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Senior Member
Brand: Keystone
Model: Sprinter
State: Florida
Posts: 1,422
THOR #15553
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Quote:
Originally Posted by Rich9592
You reference "breakers" plural. I'm aware of only the Line Circuit Breaker to right side of control switch. Are there others?
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Can not see where you are measuring from. Too many obstacles. Tape blocking things. What is the loose white neutral wire? Can you take a clearer picture showing all wire connections? Remove the tape and use the probes as I described above.
__________________
2011 Keystone Sprinter 323BHS. Retired Master Electrician. All Motor Homes are RV's. All RV's are not Motor Homes.
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03-22-2020, 01:51 AM
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#9
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Junior Member
Brand: Thor Motor Coach
Model: 2017 Vegas 24.1
State: Texas
Posts: 16
THOR #14032
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Quote:
Originally Posted by cavie
Can not see where you are measuring from. Too many obstacles. Tape blocking things. What is the loose white neutral wire? Can you take a clearer picture showing all wire connections? Remove the tape and use the probes as I described above.
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Loose wire/s are jumpers from ATS to Gen wires, I removed wire nuts and jumpers then taped meter probes to incoming Gen hot/neutral wires. I'll need to work up more courage before holding meter probes to Gen wires.
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03-22-2020, 01:58 AM
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#10
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Site Team
Brand: Thor Motor Coach
Model: ACE 27.1
State: Florida
Posts: 14,305
THOR #7035
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There's your problem!
__________________
Ted & Melinda
2016 ACE 27.1
2016 Chevy Sonic Toad - Selling
2020 Chevy Colorado Z71 Trail Runner Toad
2024 Chevrolet Trax 2RS - Soon 2B TOAD
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03-22-2020, 02:15 AM
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#11
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Member
Brand: Thor Motor Coach
Model: ACE 30.1
State: Florida
Posts: 53
THOR #17950
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I want to start a new post with a different electrical question but don't know how. Who can help me?
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03-22-2020, 02:23 AM
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#12
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Site Team
Brand: Entegra
Model: Accolade 37TS
State: South Dakota
Posts: 8,758
THOR #1469
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Quote:
Originally Posted by richardehrhart
I want to start a new post with a different electrical question but don't know how. Who can help me?
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First go into the area of the forum where the question would be appropriate, for example Maintenance and Repair, or Class C or another area. When you get into that area click on "New Thread" and then submit your new question.
I will suggest that you conduct a search of the forum beforehand to see if the question has already been asked and answered.
__________________
Dave
US Army (Ret)
2020 Entegra Accolade 37TS
2019 Jeep Grand Cherokee Trailhawk (Toad)
FMCA - F432054
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03-28-2020, 07:12 PM
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#13
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Member
Brand: Thor Motor Coach
Model: chateau 23U
State: Florida
Posts: 60
THOR #1241
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circuit breaker on genset panel.
Check the circuit breaker on the generator control panel. It's easy to knock off with your hands. You need to reach around the side of the flange.
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03-28-2020, 11:20 PM
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#14
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Senior Member
Brand: Keystone
Model: Sprinter
State: Florida
Posts: 1,422
THOR #15553
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Quote:
Originally Posted by Rich9592
Loose wire/s are jumpers from ATS to Gen wires, I removed wire nuts and jumpers then taped meter probes to incoming Gen hot/neutral wires. I'll need to work up more courage before holding meter probes to Gen wires.
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If you must use tape on volt meter leads. please stay away from electricity. I will no longer take part in this discussion.
__________________
2011 Keystone Sprinter 323BHS. Retired Master Electrician. All Motor Homes are RV's. All RV's are not Motor Homes.
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