Brown should be the tail lights.
SOURCE: 1999 chevy tahoe 5 wire trailer wires, what does each color do?
Yellow is the left turn signal, White is ground, Dark Green is the right turn signal, Brown is the running lights and brake light, the others are for the electric brake set up for the trailer.
SOURCE: trailer light problem
Check it with a test light. White-ground, Yellow-left turn, Green-right turn, Brown-tailights. Check it on the truck first. There are seperate fuses for just the trailer wiring in the fuse box under the hood. The Blue and Red wires are for Trailer brakes, don't worry about those.
SOURCE: Towing light problem on wiring them up.
It looks like there could be a service bulletin to fix this.
TO: ALL TOYOTA DEALER PRINCIPALS,
SERVICE MANAGERS, PARTS MANAGERS
SUBJECT: SPECIAL SERVICE CAMPAIGN 10H
(2000 TUNDRA AND 1999 - 2000 TACOMA TRAILER TOWING WIRE HARNESS
CONVERTER REPLACEMENT)
Toyota will initiate a Special Service Campaign to replace the Toyota Trailer Towing Wire Harness
Converter (converter) on certain 2000 model year Tundra and 1999 - 2000 model year Tacoma
vehicles equipped with a genuine Toyota Trailer Towing Hitch or Bumper Hitch. This accessory
is included in the Towing Hitch Kit installed at ports (PIO) and by dealers (***); it is also sold by
dealers as an over-the-counter or service part.
An electrical short or open circuit can cause a fault in the genuine Toyota Trailer Towing Wire Harness
Converter (converter). This can cause a failure of the converter, and if a trailer is being towed at the time,
non-operation of the trailer lights. In limited cases, the converter housing could become heat-deformed.
In the case of the Tundra, the circuitry utilized in the converter was inadequate to properly manage
vehicle and/or trailer-side voltage spikes. If the converter is exposed to a voltage spike it may cause an
electrical short or open circuit within the converter.
As for the Tacoma, due to deficient waterproofing and improper installation location of the converter,
which is mounted in the lower portion of the taillight cavity of the vehicle, an electrical short circuit will
occur if water enters the converter housing.
The following vital information is provided to inform you and your staff of the campaign notification
schedule and your degree of involvement.
1. Owner Notification Letter Mailing Date
The owner notification will be conducted in two phases:
• The first phase will be launched in late August and involve vehicles equipped with port
installed (PIO) genuine Toyota Towing Hitch Kits.
• The remaining vehicle owners, whose vehicles may be equipped with a dealer installed (***)
genuine Toyota Trailer Towing Wire Harness Converter, will be notified in the second phase
to be launched in early September.
We have attached copies of the owner notification letters for your reference.
If you are contacted by an owner of an involved vehicle, who has not yet received a notification,
please verify eligibility through TDN or TIS, inspect the vehicle to assure it is equipped with the
affected part, and perform repairs as outlined in the attached Technical Instructions.
SOURCE: I am working on a
The most reliable place I know of for a complete electrical schematic is available for a fee from
www.alldata.com
This is a website many professional shops use to get their information, schematics, and diagrams, as well as step by step instructions. Here is a link to buy a manual that may be cheaper than using alldata. They want $39.95 plus shipping for this USED manual.
http://www.auto-repair-manuals.com/GMC-1980-MediumHeavy-Duty-Truck-Factory-Wiring-Diagrams.html
Here is their description of the manual;
This manual provides Wiring Diagrams for 1980 Medium and Heavy Duty Truck Models.
Contents: Cab, Engine and Chassis Wiring Diagrams for
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