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Old 08-02-2011, 10:29 PM   #15
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I only have two neutral wires coming into my transfer switch from the genny, I wonder what the third one is for?

The generator neutral wires should have continuity to ground, usually the connection is made at the generator wiring box. You may want to open that one up and inspect it.

You definitely should be able to rule out the transfer switch by verifying no continuity across the neutral contacts with the neutral wires disconnected. This way you will have isolated it to the wiring.

I think you're almost there, just have to keep the state bird at bay.
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Old 08-02-2011, 10:38 PM   #16
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Originally Posted by Luv2go View Post
I only have two neutral wires coming into my transfer switch from the genny, I wonder what the third one is for?

I have a black, a white, a red, and a ground coming from the gen to the transfer switch...The wires i am referring to are where they come out of the gen and into a junction box located in the generator compartment. Then it's hard wired back to the transfer switch.


The generator neutral wires should have continuity to ground, usually the connection is made at the generator wiring box. You may want to open that one up and inspect it.

See above statement.

You definitely should be able to rule out the transfer switch by verifying no continuity across the neutral contacts with the neutral wires disconnected. This way you will have isolated it to the wiring.

I will jump on that in the morning.

I think you're almost there, just have to keep the state bird at bay.
Well you guys have pointed me in the right direction....again THANK YOU!!!!
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Old 08-03-2011, 07:25 PM   #17
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OK..Now I'm really beating my head against the wall..
I went out and did what you said by pulling the white (neutral) wires off the transfer switch and checked continuity on the contacts. It was and open SO I thought I ruled out the transfer switches. I hooked up the white wires to the transfer switch with the exception of the white wire coming from the generator thinking that was where the problem is. I go to plug the shore power in and BAM the GFI trips again!!! SO I start from square one again by removing all the white (neutral) wires from the transfer switch with the exception of the white (neutral) wire coming in from the shoreline plug. STILL trip the GFI, SO I leave the line side (shoreline power) connected at the transfer switch and disconnect the load side of the transfer switch and I am still tripping the GFI.....I am TOTALLY lost as to what is happening here. Ive even replaced the GFI thinking it was going bad...still tripping it.
CLUELESS!!
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Old 08-04-2011, 02:19 AM   #18
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Originally Posted by nopes67 View Post
OK..Now I'm really beating my head against the wall..
I went out and did what you said by pulling the white (neutral) wires off the transfer switch and checked continuity on the contacts. It was and open SO I thought I ruled out the transfer switches. I hooked up the white wires to the transfer switch with the exception of the white wire coming from the generator thinking that was where the problem is. I go to plug the shore power in and BAM the GFI trips again!!! SO I start from square one again by removing all the white (neutral) wires from the transfer switch with the exception of the white (neutral) wire coming in from the shoreline plug. STILL trip the GFI, SO I leave the line side (shoreline power) connected at the transfer switch and disconnect the load side of the transfer switch and I am still tripping the GFI.....I am TOTALLY lost as to what is happening here. Ive even replaced the GFI thinking it was going bad...still tripping it.
CLUELESS!!
maybe this will help. i have more reference material if this doesn't help.

Electrical Tutorial

http://www.phrannie.org/phredex.html
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Old 08-04-2011, 05:55 AM   #19
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Earlier, when you removed both lines and neutral shore power wires you got no trip but when you have line hooked up and neutral unhooked you get a trip. Did you leave the ground hooked up when you removed the lines and neutral?

Sounds like the shore cord is bad now! Does the shore cord go right into the transfer switch or does it have other junction boxes, cord reels, etc that cold be where the problems is?

One other thought. I assume the coach is 50A (at least the transfer switch pic I posted is 50A). Have you replaced the adapters you are using to plug into the 20A outlet? Sometimes they do go bad.

The last thing I can suggest is fabricating a temporary shore power cord (does not have to be the right gauge, etc, is this is for troubleshooting only), wiring would be: two wires from the line connection of a 120V 15A plug, one to L1 of the transfer sw (or where the black wire from the shore cord would connect to), another to L2 of the transfer sw (or where the red wire from the shore cord would connect to), this is so both lines are in parallel which is the way the 30A-50A adapter works, neutral connection of the 120V 15A plug to the neutral connection of the transfer switch (white wire), and ground to ground of the switch (green wire). This will eliminate the shore power cord and adapters so you can determine whether those are bad.
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Old 08-04-2011, 04:14 PM   #20
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Earlier, when you removed both lines and neutral shore power wires you got no trip but when you have line hooked up and neutral unhooked you get a trip. Did you leave the ground hooked up when you removed the lines and neutral?

Yes I did leave the ground hooked up.

Sounds like the shore cord is bad now! Does the shore cord go right into the transfer switch or does it have other junction boxes, cord reels, etc that cold be where the problems is?

Shore cord goes right into the transfer switch.

One other thought. I assume the coach is 50A (at least the transfer switch pic I posted is 50A). Have you replaced the adapters you are using to plug into the 20A outlet? Sometimes they do go bad.

Yes it is 50A. I have not replaced the adapters, however I have wiggled, and bent them while they were unplugged from the MH..No trip on the GFI.

The last thing I can suggest is fabricating a temporary shore power cord (does not have to be the right gauge, etc, is this is for troubleshooting only), wiring would be: two wires from the line connection of a 120V 15A plug, one to L1 of the transfer sw (or where the black wire from the shore cord would connect to), another to L2 of the transfer sw (or where the red wire from the shore cord would connect to), this is so both lines are in parallel which is the way the 30A-50A adapter works, neutral connection of the 120V 15A plug to the neutral connection of the transfer switch (white wire), and ground to ground of the switch (green wire). This will eliminate the shore power cord and adapters so you can determine whether those are bad.
I will do that this weekend. In the meantime I did a little more troubleshooting and with everything connected with the exception of the white (neutral) wires at the generator junction box, the GFI does NOT trip after WAITING a period of time..its almost like something has to de-energize or reset before I can plug the shore power back in without tripping the GFI. I will dig into it a little more AGAIN once I have a chance to review what Dan has posted.
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