Will 14 Gauge Wire Fit Inside the Grommets on the etrailer Trailer Wiring Junction Box?  

A sea ghost, a wilderness and two perceptions

Joe, I have used this box to house my seven pin harness wire for my 5th wheel. I think as far as the wiring of the 14 gauge wire you should be fine. The only thing I would be concerned over maybe is were you put it. If you’re putting small boats on and off your trailer if you hit it a couple of times you may crack the housing of it. Mine is in a place it’s not going to get hit. There is a place to screw down the wire harness to keep it from moving or pulling out. I had no issues with wiring mine up. The one hint I could give you is the box cover only goes on one way. I failed to see that till I had mine all wired up, so the name on mine is upside down. I thought the cover would go on either way…..wrong. Other than that it’s a good unit and I like it. Hope this helps.

I purchased the same 99009 junction box to rewire my 16ft utility trailer. It has the 7 pin connector wiring harness which is around 1/2” in diameter and it fit in the grommet with no problem. It is very nice having a junction block to split wiring up. If there is an issue with just one circuit you can get into the box and just change it out. More organized.

I have one of these boxes. Very high quality. I ran 7 way jacketed wire thru one of the grommets to give you an idea of fit. The wire included four 14 gauge wires, two 10 gauge wires, and one 12 gauge wire.