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Trailer 6-way connector diagram
The wiring code for the 6-way connector is shown below. This is most commonly
used on horse trailers, stock trailers, and utility trailers. Note that the
wiring colors are the Pollack Company suggestions and not necessarily what you
can expect to find. The terminal positions as pictured below are standard for
this style connector. When changing connectors match the positions from old to
new or better yet test for function and be sure the connector is wired to the
standard code. Also notice that the center (A) terminal is not the brake
terminal nor the ground terminal. The center terminal is listed as an auxiliary
terminal and is used for either backup lights or a 12 volt (+) wire. We
recommend that this terminal be wired for 12 volt (+) for charging the breakaway
switch battery. Breakaway switches are now pretty much required on most trailers
with electric brakes and a charged battery is required for proper operation.
| Wiring diagram |
| plug body |
marked |
color |
function |
socket body |
 |
GD |
White |
ground |
 |
| TM |
Brown |
Tail Lights |
| LT |
Yellow |
Left Turn |
| S |
Red |
Stop or
electric brake |
| RT |
Green |
Right Turn |
| A |
Blue |
Auxiliary |
| Trailer End |
NOTE: center terminal is
A |
Car End |
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Trailer 6-way connector diagram
Pictured below is the Pollock 7 way connector, which is the connector style in
most common use on RV trailers and is becoming increasingly popular on horse and
utility trailers. This connector is also manufactured by the Theodore Bargman
Company and there are also some generics around. They are supposed to be
interchangeable and the wiring color code is maintained among the various
brands.
As you can see in the illustration below the back side of the connector body
is labeled at each terminal. The labels are listed below with the function
assigned to that pin.
On the tow vehicle side with the exception of 96-98 Ford and Dodge pickups
and SUV's with factory installed trailer wiring, wire color alone should not be
relied on, always test and match the function to the appropriate terminal.
On the trailer side RV's for the most part are wired to match the connector
colors. Any plug that has been changed or extended, along with horse and utility
trailers should be tested when replacing for any reason to be sure the function
matches the terminal.
It should be noted below that the center terminal is labeled as an
auxiliary circuit, most commonly used for backup lights not a ground
terminal as many try to make it.
Also after the connector diagrams find more information on wire colors used
by GM, Ford, and Dodge.
Wiring Code 7 way Car End
| # |
Color |
Gage |
Circuit Function |
connector interior |
| 1 |
white |
10 |
common ground |
![[7 way connector]](images/7wayce.gif) |
| 2 |
blue |
12 |
electric brake |
| 3 |
green |
14 |
tail/running lights |
| 4 |
black |
10 |
battery charge (+) |
| 5 |
red |
14 |
left turn/stop |
| 6 |
brown |
14 |
right turn/stop |
| 7 |
yellow |
14 |
auxiliary/back up |
| NOTE: #7 is the center terminal and
currently is most commonly used for backup lights. |
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Wiring Code 7 way Trailer End
| # |
Color |
Gage |
Circuit Function |
connector interior |
| 1 |
white |
10 |
common ground |
![[7 way connector]](images/7wayte.gif) |
| 2 |
blue |
12 |
electric brake |
| 3 |
green |
14 |
tail/running lights |
| 4 |
black |
10 |
battery charge (+) |
| 5 |
red |
14 |
left turn/stop |
| 6 |
brown |
14 |
right turn/stop |
| 7 |
yellow |
14 |
auxiliary/back up |
| NOTE: #7 is the center terminal and
currently is most commonly used for backup lights. |
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| This chart should be used as a general guide only, you
should always test before connecting your wiring.
This chart also may not be accurate for vehicles with factory installed
trailer harnesses. In past 2-3 years manufacturers have begun to match the
wire colors to the code for the common 7 way RV connector. More on that
after the chart.
| Caution if your vehicle has a diagnostic
indicator that tells you when a lamp is burned out or not
functioning, you may need special wiring adapters and
testers. Not using these adapters may cause damage to the vehicle
wiring or computer. |
| function |
GM |
Ford |
Chrysler |
| left turn & brake lights |
yellow |
lt green w/orange stripe |
dk green |
| right turn & brake lights |
dk green |
orange w/blue stripe |
brown |
| tail lights |
brown |
brown |
black or black w/yellow stripe |
| back up lights |
lt green |
black w/pink stripe |
violet |
| ground - see note 1 |
black |
black or grey |
black |
| In addition to the above some cars and trucks have a
separate light for the brake light, most commonly identified by
amber turn lenses in the rear. Chrysler and Jeep may have the
separate light and use red lenses. If you have this type of wiring
a converter is required. |
| brake light |
lt blue or pink |
red w/green stripe |
white |
| Note 1: We recommend attaching the trailer harness
ground directly to the frame or a solidly attached sheet metal
part, using a screw or bolt. The single most common cause of
trailer lighting problems is a poor ground on the tow vehicle or
trailer. |
The common flat 4 wire connector used on boat, snowmobile, and light
utility trailers most commonly uses the following code.
| Flat 4 wiring code |
| white |
ground |
| yellow |
left turn/brake light |
| green |
right turn/brake light |
| brown |
tail |
Factory installed wiring harnesses frequently match the flat 4 colors.
Notes about GM OEM wiring harness. Most GM vehicles except '99 &
2000 Silverados match the following.
GM trailer wiring code
|
| white |
ground |
| yellow |
left/brake |
| green |
right/brake |
| brown |
tail |
| light green |
backup |
| blue |
trailer brakes |
| red * |
12 volt + |
| * Pickups only: since approximately 1996 the
12 volt + wire is orange. The orange and blue wires are in a
separate bundle taped to the wire harness that runs down the frame
on the drivers side. A white wire may also be found in that
bundle, it is a brake light wire which is not normally used for
trailer wiring. |
Brake control connector wiring harness
color code for factory supplied harness
| Cheverolet/GMC |
| GM supplied brake control
harness |
Tekonsha brake control wires
All electronic models |
function |
| red |
black |
+12 volt |
| light blue |
red |
stoplight |
| black |
white |
ground |
| dark blue |
blue |
trailer brakes |
| brown |
not used |
|
| NOTE: The above applies only to the GM
factory supplied harness, if using Tekonsha harness #3025,
the harness colors match the brake control |
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Dodge tow vehicles with the Factory Tow Package Brake Connector
Dodge vehicles with this package are equipped with a 15 amp fused
power line which is insufficient for 3 & 4 axle (6 or 8 brake)
applications. For 3 & 4 axle (6 or 8 brake) applications a separate
power wire should be installed directly from the battery positive to the
brake control and should include an inline 30
amp auto reset circuit breaker.
Brake control connector wiring harness
color code for factory supplied harness
| Dodge/Chrysler |
| Dodge/Chrysler supplied brake
control harness |
Tekonsha brake control wires
All electronic models |
function |
| red w/black tracer |
black |
+12 volt |
| white w/tan tracer |
red |
stoplight |
| black |
white |
ground |
| blue |
blue |
trailer brakes |
| NOTE: The above applies only to the
Dodge/Chrysler factory supplied harness, if using Tekonsha
harness #3020, the harness colors match the brake control |
|
Ford tow vehicles with the Factory Tow Package Brake Connector
Ford vehicles with this package are equipped with a 20 amp fused
power line which is insufficient for 3 & 4 axle (6 or 8 brake)
applications. For 3 & 4 axle (6 or 8 brake) applications a separate
power wire should be installed directly from the battery positive to the
brake control and should include an inline 30
amp auto reset circuit breaker.
Brake control connector wiring harness
color code for factory supplied harness
| Ford |
| Ford supplied brake control
harness |
Tekonsha brake control wires
All electronic models |
function |
| pink |
black |
+12 volt |
| red |
red |
stoplight |
| white |
white |
ground |
| dark blue |
blue |
trailer brakes |
| brown |
not used |
|
| NOTE: The above applies only to the Ford
factory supplied harness, if using Tekonsha harness #3035,
the harness colors match the brake control |
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