Re: Trailer wiring question

From: KenCo (ken@kencofish.com)
Date: Wed Aug 06 2003 - 23:19:16 EDT


Jon wrote:
>
> I have a trailer with the standard 7-way connector, and I'm trying
> to verify that everything is well with the wiring. I haven't hooked
> it up to the truck yet because the 7-way plug on my truck isn't fully
> wired up. So, I have been using a 12v DC power supply and a couple of
> alligator clips to test the various lights on the trailer. So far,
> everything has worked the way I expected it to except for the back-up
> lights.
>

12 o'clock (fat one) = ground (wht)
10 " and 2 are marker and tail (blk and brn)
4 " and 8 are left/right signals (yel and grn)
6 " brake (red)
center = aux (blue), use for backup or charging an aux batt.
for emerg. elec. brakes (the suicide pin/cord setup)
or an elec. tailgate.

HTH :)

> Am I correct in assuming that grounding the proper pin on the 7-way
> connector and appling 12v to the round pin right in the middle should
> light up the trailer's back-up lights? When I do this, the brake lights
> illuminate instead. (The brake lights work just fine when I test them
> individually via the right/brake left/brake pins though, so its not
> something as simple as some crossed wires or having the lenses on the
> wrong bulbs.)
>
> BTW, I don't know if this helps at all, but when I supply power to
> the center pin and the brake lights go on, if I pull one of the
> back up light bulbs, the brake light on that side will go out.
>
> Anyway, unless anyone has a better idea, if someone could confirm
> wether applying 12v to that center pin *should* light up the back-up
> lights, I'll just trace the wiring and re-wire it if I have to to
> make that happen.
>
> Thanks!
>
> --
>
> -Jon-
>
> .---- Jon Steiger ------ jon@dakota-truck.net or jon@jonsteiger.com ------.
> | I'm the: AOPA, DoD, EAA, NMA, NRA, SPA, USUA. Rec & UL Pilot - SEL |
> | 70 Cuda, 90 Dak 'vert, 92 Ram 4x4, 96 Dak, 96 Intruder 1400, 96 FireFly |
> `------------------------------------------ http://www.jonsteiger.com ----'

--
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