John E Davies Posted June 23, 2018 Share Posted June 23, 2018 (edited) EDIT 03/07/21 Here is a rear J Box: ... https://olivertraveltrailers.com/forums/topic/5271-how-to-junction-box-for-the-7-wire-trailer-harness-under-the-front-dinette-seat/ I did this a while back to get a little extra reach, I added an 8 ft harness assembly , cutting off the excess Oliver harness. I will just post pics and if you have any questions I will answer them. It is really straight forward, I liked how I could sit down in comfort and work on the box with it clamped to a milk crate. When completely wired, I just moved it back under the A frame and stuck it down with 3M VHB tape, and secured the cables. The Oliver and Hopkins wire colors matched perfectly on MY trailer, there is no guarantee so you must check the diagram and/or use a meter. https://www.etrailer.com/Wiring/Hopkins/HM20087.html?feed=npn&gclid=Cj0KCQjw37fZBRD3ARIsAJihSr2jOZrEUWhhM8c-BzUk0FIRPKP91TUs7m8NtRYESlC3fWdjnLhiUUsaAtVtEALw_wcB https://www.etrailer.com/Accessories-and-Parts/Pollak/PK52248.html Be very careful cutting away the outer insulation, the wires are laid in a spiral and it would be easy to cut them. Use GREAT care! [attachment file=139739] Here's the placard for inside the J Box cover: [attachment file=Oliver Junction Box wiring placard.docx] I like the ability to troubleshoot the wiring without cutting anything, and I can add extra circuits if I need to, like for my future electric-over-hydraulic brake booster..... Cool. NOTE: the box is weather resistant, not completely water tight, though the lid does have a nice rubber gasket..... I added a couple of small drain holes in case any moisture gets inside. It is important to NOT blast it directly with a pressure washer. John Davies Spokane WA Oliver-Junction-Box-wiring-placard.docx Edited March 8, 2021 by John E Davies 1 "Mouse": 2017 Legacy Elite II NARV (Not An RV) Two Beds, Hull Number 218, See my HOW TO threads: https://olivertraveltrailers.com/topic/john-e-davies-how-to-threads-and-tech-articles-links/ Tow Vehicle: 2013 Land Cruiser 200, 33" LT tires, airbags, Safari snorkel. Link to comment Share on other sites More sharing options...
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