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03-23-2018, 06:51 PM
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#1
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Junior Member
Join Date: Mar 2018
Location: Maumee
Posts: 8
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5th Wheel Gen prep transfer switch wiring
I install a Onan generator on my Jayco with the gen prep factory installed. I have everything setup except the transfer switch has a red, black, white, and ground wires but my Onan gen only has a black, white, and green(ground wire). Why does the transfer switch have a red and black wire in junction box from the transfer switch? Thanks
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03-23-2018, 07:07 PM
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#2
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Senior Member
Join Date: Dec 2014
Location: Akron
Posts: 3,209
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Quote:
Originally Posted by OggieDoggie
I install a Onan generator on my Jayco with the gen prep factory installed. I have everything setup except the transfer switch has a red, black, white, and ground wires but my Onan gen only has a black, white, and green(ground wire). Why does the transfer switch have a red and black wire in junction box from the transfer switch? Thanks
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Is your unit a 50-amp unit with 2 A/C units? Sounds like the wiring from a 30-amp generator going into a 50-amp RV.
__________________
Rob R.
Akron, OH
2014 Seneca 37TS
Toads: 2019 Ford Edge ST or 2013 Ford Focus ST
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03-23-2018, 07:15 PM
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#3
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Junior Member
Join Date: Mar 2018
Location: Maumee
Posts: 8
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It is a 50 amp with 1 AC unit. Can I hookup the white from gen to white at transfer switch and then hookup red and black from transfer switch to the black generator?
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03-23-2018, 07:33 PM
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#4
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Senior Member
Join Date: Dec 2014
Location: Akron
Posts: 3,209
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Quote:
Originally Posted by OggieDoggie
It is a 50 amp with 1 AC unit. Can I hookup the white from gen to white at transfer switch and then hookup red and black from transfer switch to the black generator?
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I am unqualified to make any recommendation, I would strongly suggest you consult with a qualified technician with proficiency in RV electrical systems. They are different than "sticks and bricks" systems in some respects.
What is the rating of the generator you have? Does it have just a single circuit breaker on the generator panel?
__________________
Rob R.
Akron, OH
2014 Seneca 37TS
Toads: 2019 Ford Edge ST or 2013 Ford Focus ST
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03-23-2018, 07:41 PM
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#5
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Senior Member
Join Date: Aug 2016
Location: Villas NJ
Posts: 159
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Sounds like you have a 120 Volt generator and your camper is wired for 220 Volts. You can probably wire the black from generator to the black and red of transfer switch but will not have enough power to run everything in RV.
__________________
2020 Pinnacle 36FBTS 
2016 Chevy 3500HD Duramax
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03-23-2018, 08:05 PM
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#6
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Senior Member
Join Date: Oct 2016
Location: Saint Thomas, PA
Posts: 2,234
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How many breakers and what amps are they on the Onan? Is it a 5500?
Earl
__________________
2017 Eagle 293RKDS, factory ordered, lots of mods and upgrades. More than I can list.
2018 Ram 3500 crew cab long bed SRW diesel 6spd Aisin 4wd Tradesman.
B&W Ram puck 5th wheel
Line-X premium
Mopar wheel to wheel steps
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03-23-2018, 08:12 PM
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#7
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Junior Member
Join Date: Mar 2018
Location: Maumee
Posts: 8
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Onan 2500 lp 1 breaker
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03-23-2018, 08:15 PM
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#8
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Senior Member
Join Date: Dec 2014
Location: Akron
Posts: 3,209
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A very small generator for a 50-amp rig. It has a single "hot" wire where a larger generator would have 2 hot legs.
You will be severely limited in what you can run. It may struggle to start even your one AC, if it will at all.
__________________
Rob R.
Akron, OH
2014 Seneca 37TS
Toads: 2019 Ford Edge ST or 2013 Ford Focus ST
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03-23-2018, 08:17 PM
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#9
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Senior Member
Join Date: Oct 2016
Location: Saint Thomas, PA
Posts: 2,234
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There's the issue. Should be a 5500 Onan with two breakers and two blacks. You will have to pick which side of the load panel you want to power. So Onan black to either the red or black. But I don't know if the transfer switch will pull in. You may have to attach the onan black to both the black and red. You won't power much with a 2500. The trailer is designed for a 5500. The 2500 made for the compartment? The 5500 pulls fresh air and cooling air through the bottom.
Earl
Sent from my XT1254 using Tapatalk
__________________
2017 Eagle 293RKDS, factory ordered, lots of mods and upgrades. More than I can list.
2018 Ram 3500 crew cab long bed SRW diesel 6spd Aisin 4wd Tradesman.
B&W Ram puck 5th wheel
Line-X premium
Mopar wheel to wheel steps
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03-23-2018, 08:32 PM
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#10
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Senior Member
Join Date: Dec 2014
Location: Akron
Posts: 3,209
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Quote:
Originally Posted by OggieDoggie
It is a 50 amp with 1 AC unit.
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Is your single AC unit a 15,000 BTU unit?
__________________
Rob R.
Akron, OH
2014 Seneca 37TS
Toads: 2019 Ford Edge ST or 2013 Ford Focus ST
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03-24-2018, 06:20 AM
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#11
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Senior Member
Join Date: Nov 2011
Location: Where ever the boss says we're going.
Posts: 16,103
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Quote:
Originally Posted by OggieDoggie
Onan 2500 lp 1 breaker
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Definitely too small and trying to make it work is not a good idea.
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