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Trailer Wiring

Tiny
FDFAIRLN
  • MEMBER
  • 3 POSTS
I have the same problem. Did you get yours resolved?
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Monday, May 22nd, 2017 AT 12:30 PM (Merged)
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Depending on what type of plug you put on your truck whether it was factory or the four way there should be one wire that goes to ground on the frame of truck and one wire that goes on ground of trailer. Also the lights should be grounded to the trailer as well with no plastic in between the bracket and trailer.
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Monday, May 22nd, 2017 AT 12:30 PM (Merged)
Tiny
SMB677
  • MEMBER
  • 1 POST
  • 2004 CHEVROLET SILVERADO
  • 110,000 MILES
I cannot get power to the constant hot wire to my 7 way in the rear plug. Is the stud #1 supposed to have the 40 amp fuse. I have all of the turn and stop lights working at the plug and all of the other fuses seem to be good. I have a separate trailer brake control unit wired and plugged in under the dash and have used trailer with electric brake with no problems. I just wonder why I don't have the constant power to the rear plug.
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Monday, May 22nd, 2017 AT 12:30 PM (Merged)
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Yes stud one is the hot wire for the trailer connector it should have a 40 amp fuse and go to position E in the connector at back
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Monday, May 22nd, 2017 AT 12:30 PM (Merged)
Tiny
MICKY INGRASSIA
  • MEMBER
  • 1 POST
  • 2004 CHEVROLET SILVERADO
  • 6.0L
  • V8
  • 4WD
  • AUTOMATIC
  • 51,000 MILES
I have an appropriate seven blade trailer plug. All functions work except the auxiliary power feed. But I cannot find where the auxiliary power feed wire gets its power from.
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Monday, May 22nd, 2017 AT 12:30 PM (Merged)
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
It gets it from stud #2 on fuse block under hood see picture. It is a red wire on plug in.
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Monday, May 22nd, 2017 AT 12:30 PM (Merged)
Tiny
REDNECK243
  • MEMBER
  • 1 POST
  • 2003 CHEVROLET SILVERADO
  • 6.6L
  • V8
  • TURBO
  • 4WD
  • AUTOMATIC
  • 140,000 MILES
I have lost the power to my trailer plug. The fuses inside the driver door check out with a light tester. Are there relays in between the fuses and the trailer plug?
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Monday, May 22nd, 2017 AT 12:30 PM (Merged)
Tiny
JIS001
  • MECHANIC
  • 3,408 POSTS
Check the fuse box in the engine compartment. It is located on the drivers side. The trailer fuse is located in there. Check out the fuses and let us know what you find.
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Monday, May 22nd, 2017 AT 12:30 PM (Merged)
Tiny
JUDYBUG
  • MEMBER
  • 1 POST
  • 2000 CHEVROLET SILVERADO
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 50,000 MILES
Electrical problem
2000 Chevy Silverado 6 cyl Two Wheel Drive Automatic 50000 miles

This truck does not have a plug in module for hooking up trailer. A plug must be hard wired to wires coiled on top of spare tire. I need a wiring diagram for attaching a trailer plug.
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Monday, May 22nd, 2017 AT 12:31 PM (Merged)
Tiny
RHALL77
  • MECHANIC
  • 3,361 POSTS
Some of those trucks there is a t fitting that you can by at your local parts store that plugs right into the factory harness. If not check the left frame rail all your wiring might be there. But I would suggest the t fitting first. Then you dont have to cut anything
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Monday, May 22nd, 2017 AT 12:31 PM (Merged)
Tiny
PAPA1964
  • MEMBER
  • 1 POST
  • 2005 CHEVROLET SILVERADO
  • 5.3L
  • V8
  • 4WD
  • AUTOMATIC
  • 115,789 MILES
We added a second seven prong plug in the box made sure all wires went to the right prong had power at the power prong plugged the camper in and we had power to the brake prong in plug it and no power to that prong then blew the fuse and can not locate the fuse block that the trailer fuse is in where is it located so we can change the fuse
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Monday, May 22nd, 2017 AT 12:31 PM (Merged)
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
It shold be underhood in the underhood fuse box
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Monday, May 22nd, 2017 AT 12:31 PM (Merged)
Tiny
WOLFIEISKING
  • MEMBER
  • 1 POST
  • 2000 CHEVROLET SILVERADO
Electrical problem V8 Two Wheel Drive Automatic 175000 miles

my 2000 Chevy Silverado has no trailer wiring connector on I bought a seven way connector like I was told to do. My chevy has 6 wires blue black white yellow green and a kinda light blue wire and I don't know what they should connect to on the connector
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Monday, June 5th, 2017 AT 5:07 PM (Merged)
Tiny
FACTORYJACK
  • MECHANIC
  • 4,159 POSTS
This wiring is at the rear of the vehicle? I have some tables of circuit description, It would be advised to verify with a test lamp before assuming the circuits are what is listed.
Service Information
2000 Chevrolet Chevy C Silverado - 2WD | Sierra, Silverado, Suburban, Tahoe, Yukon (VIN C/K) Service Manual | Body and Accessories | Body Rear End | Schematic and Routing Diagrams | Document ID: 521639

Trailer/Brake Controller Wiring Information
Table 1: Individual Conductors
Table 2: Individual Conductors

Trailer Wiring
Important: The trailer harness and fuses must be connected to the engine wiring harness junction block. The trailer harness circuits are identified in the following table. Please take note of the maximum current ratings of the circuits.

Stop lamps and turn signal lamps are similar to the description in Exterior Lights Circuit Description, with the exception of the following conditions:

"Â From the stoplamp switch, voltage is supplied to the turn/hazard switch on CKT 17 (WHT).

"Â From the turn/hazard switch, voltage is supplied to the TRL L Turn or the TRL R Turn fuse on CKT 18 (YEL) or CKT 19 (DK GRN).

"Â From the fuse, voltage is supplied to the trailer connector

Individual Conductors CKT ID Number
Color
Description

22 (HD)
WHT
Ground, 70 Amp maximum current (HD)

22 (LD)
WHT
Ground, 25 Amp maximum current (LD)

47
DK BLU
Trailer brake controller switch output

142
RED
Fuse output - Battery, 22.5 Amp maximum current

742
RED
Fuse output - Battery, 30 Amp maximum current

1324 (LD)
LT GRN
Fuse output - backup lamps, 7.5 Amp maximum current (LD)

1624 (HD)
LT GRN
Fuse output - trailer backup lamps, 7.5 Amp maximum current (HD)

1618
YEL
Fuse output - trailer turn/stop LH rear, 7.5 Amp maximum current

1619
DK GRN
Fuse output - trailer turn/stop RH rear, 7.5 Amp maximum current

1620
LT BLU
Fuse output - trailer CHMSL, 7.5 Amp maximum current

2109
BRN
Fuse output - trailer park lamp, 7.5 Amp maximum current

Z82 - Trailering Pigtail - Electrical Installation Instructions
Important: Please consult your brake controller instruction on how to wire your controller with these circuits.

The brake controller pigtail and 40A B+ trailering MaxiFuse has been provided with the HD trailering option.
Plug in the 6 Way connector into the body wiring harness junction block which is located on the upper left of the drivers footwell.

Plug-in the 40Amp B+ trailering MaxiFuse in stud #1 location of engine wiring harness junction block.
The brake controller jumper blunt cut circuits have been identified as follows:

Individual Conductors CKT ID #
Color
Description

47
DK BLU
Trailer Brake Controller Switch Output

142
RED
Fused Trailer Brake Controller Battery Feed

1620
LT BLU
Vehicle Stop Lamp Switch to Brake Controller Input

1850
BLK
Brake Controller Ground

2409
BRN
Brake Controller Illumination
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Monday, June 5th, 2017 AT 5:07 PM (Merged)
Tiny
JESSE45
  • MEMBER
  • 1 POST
02 Suburban trail light work on right
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Monday, June 5th, 2017 AT 5:07 PM (Merged)
Tiny
LOTTO
  • MEMBER
  • 1 POST
  • 2010 CHEVROLET SILVERADO
  • 22,000 MILES
2010 silverado with factory heavy duty tow package. Can't get trailer lights to work except for rt. Signal. Have tried other hookups with same result
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Monday, June 5th, 2017 AT 5:07 PM (Merged)
Tiny
RIVERMIKERAT
  • MECHANIC
  • 6,110 POSTS
Use a test light or meter to verify the trailer plug is receiving power. Use the meter to verify continuity between the plug on the trailer and the lights. Verify the bulbs are good.
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Monday, June 5th, 2017 AT 5:07 PM (Merged)
Tiny
CTOMKO
  • MEMBER
  • 2 POSTS
  • 1995 CHEVROLET SILVERADO
  • V8
  • 4WD
  • AUTOMATIC
  • 147,000 MILES
Electrical problem
1995 Chevy Silverado V8 Four Wheel Drive Automatic 147000 miles

I am trying to rewire the trailer light hook-up on my truck. Does the end going into the body of the truck just plug in somewhere, and if so where does it plug in? Is there any place I can go to get an exploded view of where it would plug in. Many thanks again for your help.

CT
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Monday, June 5th, 2017 AT 5:07 PM (Merged)
Tiny
GREENMAN 1234
  • MEMBER
  • 5 POSTS
You should have afemale plug that the wires coming from under the truck attach to green right turn yellow left turn brown running lights if you have a brake controller it should be a blue wire there is also a light green which is a charging wire for trailer
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Monday, June 5th, 2017 AT 5:07 PM (Merged)
Tiny
RESMONDO
  • MEMBER
  • 1 POST
  • 1997 CHEVROLET SILVERADO
  • V8
  • 4WD
  • AUTOMATIC
  • 148,000 MILES
Brakes problem
1997 Chevy Silverado V8 Four Wheel Drive Automatic 148000 miles

I have a 97 Chevrolet z71, unable to locate the stop switch wire to install trailer brakes. I was instructed to look for a grouping of 5-7 white wires, however, looking under the dash I have found a grouping of wires but they are all different colors and a lot more than 5-7 in the group. Any ideas on the installation?
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Monday, June 5th, 2017 AT 5:07 PM (Merged)

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