Quote:
Originally Posted by joejoebo
This is the other box
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I zoomed this photo a bit and rotated it, to highlight that a previous repair attempt has been made.
My "OEM" 2006 trailmanor has a single bundle coming up and into the small box - that bundle contains both a flexible 120-VAC grounded cord AND the "12v" wires (there are at least at least two, "hot" and ground), and IIRC, an additional low-power wire or two for my older OEM "batwing" powered radio antenna unit.
Within the small box on my older unit, the ends of the flexible 120-VAC cord (which ends at the box) were connected to the terminating wires of the OEM "Romex" segment which ran inside the upper shell, underneath the bag seal and wood edge of the rear of the front shell - around the corner, and over to the center of the horizontal roof section.
At the ends of that segment, near the AC unit, the outer cable insulation was removed to free up 3 separate "pigtail" wires for the 120-VAC connections into the Air Conditioner unit.
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Although that vertical rear edge of the front shell is supposed to be pretty stiff, some flexing occurs during opening and closing. The 3 wires inside a "Yellow" 10-AWG Romex cable are solid wire (not stranded), and they tend to break off when they have been flexed more than a few times. I will guess that this occurred in your TM, under previous ownership, and their "solution" was to run a new and naked 120VAC cable, completely separate from the existing bundle of lower-voltage DC cables. That problem has occurred in many TMs over the years.
To the extent that a new box may have been added higher up than the existing OEM "other box" (connecting the "new cable" to existing Romex within the shell ceiling), that box is in question. In the case that no such box was used, the new cable was also possibly bent too sharp (creating electrical "issues" within conductors or insulation) before terminating with pigtails for the AC unit, or the cable's internal wires may be too small.
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Please add photos of all "boxes" with the covers taken off, along with the a photo of the shell roof connection to the resulting "pigtails". Please also copy any writing which may still be present on the outside of the added cable, as to size and usage ratings. (Thanks in advance.)
It is quite possible to still measure 120-VAC at wire ends, even when substantial power is being lost by small insulation failures from "hot" into "ground" or "neutral" current paths. We should focus on resistance measurements, more than voltage.