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Old 05-15-2009, 06:22 PM   #1
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Making Generator Adapter

Hi
How do I wire a male 20 amp 4 wire (red, black, green, white) plug to a 30 amp 3 wire RV female recepticle? Thanks in advance for any help
James
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Old 05-15-2009, 06:25 PM   #2
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Are you talking 240 volts?
120 would use black, white, and green.
Black gets hot (+)
white does Not (- or neutral)
Green grass grows on the Ground
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Old 05-15-2009, 06:34 PM   #3
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Thanks, my generator has a 4 prong 120/240 volt AC/CA twist lock plug.
and I have a female RV receptical to plug RV into. I have the plug already wired but don't know how to wire the RV plug.
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Old 05-15-2009, 08:29 PM   #4
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Any electricians out there? Wife want AC at the beach this weekend.
Here is a photo of what I have, wires from male 4 prong to wire to the standard 30 amp RV recepticle.
thanks
James
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Old 05-15-2009, 08:29 PM   #5
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Quote:
Originally Posted by The Flintstones View Post
Thanks, my generator has a 4 prong 120/240 volt AC/CA twist lock plug.
and I have a female RV receptical to plug RV into. I have the plug already wired but don't know how to wire the RV plug.
The 3 wires should be configured as I posted above, the little references are to help people remember polarity when working on it. Black is positive (or hot), white is neutral, and green is the ground wire.
If you have a volt meter, check to make sure you have 120 or so volts across the black and white wires.
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Old 05-15-2009, 08:36 PM   #6
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Thanks Overlander
Its that I have four wires not three that is confusing me.
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Old 05-15-2009, 08:57 PM   #7
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Hope this helps!

RV Wiring
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Old 05-15-2009, 09:20 PM   #8
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Thanks Overlander
Its that I have four wires not three that is confusing me.
You don't connect the red wire from your generator to the 30 amp RV plug at all. It is a second 'hot' wire which is not used for 125 Volt, 30 Amp service that your RV plug provides.

You need to insulate the terminal on the red wire very carefully since it is a hot wire it must not come into contact with any of the other wires, or any other conductor, or any person.

I would suggest that you wrap it completely in several layers of electrical tape so that no metal is visible.

If this doesn't make sense to you, I suggest you get some help with this project since if you wire this incorrectly you could fry all of the electrical devices in the trailer, or yourself.
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Old 05-15-2009, 09:22 PM   #9
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Thanks Xstream
Except now I'm really confused maybe this can't be done but there are 20 amp to 30 amp adapters available so I figured it can be. If anyone can see my above posted photo to see what I have (red, black, green and white) I under stand that white and green are neutral and ground but how do I wire the red and black from generator to plug.
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Old 05-15-2009, 09:25 PM   #10
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you're adapting 220 to 110. the second 110 wire is not used as stated above. the trailer is 110.
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Old 05-15-2009, 09:27 PM   #11
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thanks you guys for all the help as I really appreciate it!!!! I get it now.
James
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Old 05-15-2009, 09:40 PM   #12
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You're limited right now to 20 amps. That's just enough to run the AC. You need to wire either the red or black wire to the hot tap on the RV receptacle.

I know your generator is rated at 5000 watts, but thats based on 2 - 20 amp legs split phase. You can only get the full power if you have a four wire system in your trailer, which you don't.

The only alternative would be to put in a separate L14-20R inlet on your trailer (definitely not standard), and you could run one 20 amp leg to the AC, and the other leg to all the other 120v circuits. Not something you can do by Sunday, and I would definitely recommend you have a qualified electrician do this.

If you connect both the red and black wire to the RV recepacle, you will have 240v everywhere and you burn out everything.
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Old 05-16-2009, 10:06 PM   #13
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This is almost identical to what you need:

RV Generator Adapter 240V to 30amp plug at RVToyOutlet.com

Except instead of the L14-30R, you have the L14-20R

Refer to this for the difference:

RV Wiring

Note that the "X" (Red) wire is not connected

Good Luck
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Old 05-17-2009, 06:42 PM   #14
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I found what I needed online but I did not have the time to order and still go on trip, (poor planning, I know) but I also did not want to spend the $$ if I could make the same thing for less.
Thanks for all the advice, itsvery helpful and greatly appreciated.
James
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