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bigz 08-07-2013 09:42 PM

tool trailer wiring
I have noticed that i cant plug my tool trailer to a circuit with a GFI. My trailer was rigged up with a heavy cord wired to a breaker box with 2 circuits feeding off of it, i recently took the cord out of the panel and put in a park power RV plug wired to the panel. It would not work with a GFI with the old setup or the new setup. any ideas? Thanks

svronthmve 08-07-2013 09:46 PM

Possibly check your grounding / bonding on the trailer. Most likely somewhere your neutral & ground are together.

bigz 08-07-2013 09:50 PM

i forgot to mention that it even trips the GFI with the breakers off too...

bigz 08-07-2013 09:51 PM

ive checked all wires in the panel box and replaced it all when installing the RV plug... do i need to pull recepticals and check all those connections too?

jlsconstruction 08-07-2013 09:57 PM

Is the plug on the end of the wire hitting the test button on the gfci?

svronthmve 08-07-2013 10:13 PM


Originally Posted by bigz (Post 1823792)
ive checked all wires in the panel box and replaced it all when installing the RV plug... do i need to pull recepticals and check all those connections too?

I would. I suspect somewhere in your system there is a connection.

RobertCDF 08-08-2013 06:11 AM

165 Attachment(s)
That's exactly the way I've wired a number of trailers and they've always worked on gfi outlets.

bigz 08-11-2013 01:31 PM

i still cant figure it out... no loose connections or wires touching... it doing it with the breakers in the trailer off too is what puzzles me and i am using another power supply cord than i had before so it cant be that

BCConstruction 08-11-2013 01:35 PM

Have you tried it on a different circuit? maybe its mot your trailer. My ts75 was tripping a GFI the other day. I plugged it into my Bosch radio on a different circuit and it was fine. I guess it was an issue with the GFI

Tinstaafl 08-11-2013 01:51 PM

A GFCI trips when it senses a difference between the amount of current flowing in the hot wire and the neutral wire. Since you say it trips even when all breakers in the trailer are off, that would indicate either faulty wiring before the panel, or some device that's hooked up independently of the panel.

Disconnect the panel completely. If it still trips, disconnect the other end of the wire at your RV connector and try it. If it still trips, replace the connector. If it doesn't, replace or correct the connections on the wire.

bigz 08-11-2013 02:09 PM

yea ive tried several circuits...

bigz 08-11-2013 02:10 PM

its all been swapped. i did have it set up with a cord hooked directly to the breaker box and would plug it in then i took that out and went with the rv plug set up so everything is different all the way to the box... thanks

bigz 08-11-2013 02:12 PM

with my luck i probably got a cord with a bad wire in it or something both times... im going to get a new cord to go to rv plug and if that dont work change the wire from plug to the breaker box again

CanningCustom 08-11-2013 04:40 PM

I had the same issue with a 30amp twist lock plug. I just ended up making a 4' "whip" and that fixed my problem. I just wanted a 100' 10g cord wired in just like a rv, just open the inlet and pull the cord. But apparently I am not smart enough to pull that off. Oh well the whip has been working fine.

[email protected]#e 08-12-2013 11:35 PM

1 Attachment(s)
Sounds like the neutral and ground are bounded together. Usually a screw on the neutral bar that connects to the metal casing or some kind of jumper bar. This is how mines setup. The straight blade is for general power. The twistlock is for the compressor.

bigz 08-13-2013 10:17 AM

i will have to check that... ive seen that bar your talking about on boxes before im not sure if my box in my trailer has that but i will look... thanks

CanningCustom 08-13-2013 11:19 AM

[email protected] where did you get your inlets from

[email protected]#e 08-14-2013 07:21 PM


Originally Posted by CanningCustom
[email protected] where did you get your inlets from

There made by hubbell I got them from Nedco but any electrical supply house will have them. Not cheap though the covers were $60 each and the inlets were $25 for the straight blade and $60 for the twistlock I think. Works good though and nice and clean.

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