Spent all afternoon yesterday wiring up the new Hopkins 7-way molded plug/cable to the Spectro 7-place wiring junction box. To get the length needed to extend the plug 2-ft past the coupler (needed to reach the receptacles on both my trucks), and to run the 8-ft cable (needed the 11-ft version, not at Northern!) inside my single-drawbar tongue to the cross member where I had mounted the wiring box under the trailer, I had to splice in 2 feet of 4-way (ground, right-turn, left-turn, and tail) wiring cord to match the different color coding on the 7-way (made a diagram so I wouldn't repeat the earlier errors). Then, for the remaining three wires (brake, backup, and 12v accessory), I used some leftover 14ga cable (I marked each wire as to function, on both ends) and used weatherproof(shrink tube-type) butt connectors , then
more shrink tubing overall, and secured them in place in the drawbar. Then, I crimped ring terminals on all the 7 wires, and ran them to the corresponding terminal inside the Spectro box (marked as to function by the manufacturer). I ran another white 12ga wire from the box to the crossmember, and used a self-drilling screw to secure it, as a ground. Finally, I tied in the existing 4-way trailer lighting wires using new connectors and more ring terminals. Then, I used another leftover 14ga cable to extend the wiring from the Dexter brake wires, again using the shrinkable butt connectors, and
more shrink tubing over them. As it was now dark outside, and I was at a stopping point, I put the new axle in the garage (I had left it in the bed of my truck overnight, as it was a convenient workbench of sorts), intending to install it today. If it stops raining, that is! I do have to comment on using the Spectro junction box...easy to install, and why didn''t I use one before? I intend to re-wire my carhauler (from a 6-way plug to a 7-way), before I next use it, and this box will make it easy.
Update: added pics after finished wiring

- box open, before brake cable added
- Photo20140413_164613.jpg (88.43 KiB) Viewed 985 times
and

- closed, with brake wiring added
- Photo20140413_164613a.jpg (76.4 KiB) Viewed 985 times