2006 Silverado 12v Trailer Constant Problem

[SafetyMan]

Mornin fella's...

 

I have no power to the 12v constant post on my 7 way.

 

I have a 40A maxifuse in Stud #1 under the hood, and a 30A in Stud #2.

 

Any thoughts?

 

Should be post #4 in this diagram:

 

 

 

 

I had ALL of the wiring pulled out of my enclosed bike trailer because the interior lights didn't work. Then I put my test light on the truck.

 

 

When I hooked the F350 up, the lights worked with no problem.

[jrrod2004]

I think that I had the same problem a while back, I think that it was a different fuse.....let me check something....

[jrrod2004]

Mine was these (the ones are in BOLD):

 

 

 

The fuse block access door is on the driver's side edge of the instrument panel. Pull off the cover to access the fuse block.

 

To remove fuses, hold the end of the fuse between your thumb and index finger and pull straight out.

 

You may have spare fuses located behind the fuse block access door. These can be used to replace a bad fuse. However, make sure it is of the correct amperage.

 

 

 

 

 

 

RR WPR

 

Not Used

 

SEO ACCY

 

Special Equipment Option Accessory

 

WS WPR

 

Windshield Wipers

 

TBC ACCY

 

Truck Body Controller Accessory

 

IGN 3

 

Ignition, Heated Seats

 

4WD

 

Four-Wheel Drive System, Auxiliary Battery

 

HTR A/C

 

Climate Control System

 

LOCK (Relay)

 

Power Door Lock Relay (Lock Function)

 

HVAC 1

 

Climate Control System

 

LT DR

 

Driver's Door Harness Connection

 

CRUISE

 

Cruise Control, Power Take Off (PTO)

 

UNLCK (Relay)

 

Power Door Lock Relay (Unlock Function)

 

RR FOG LP

 

Not Used

 

BRAKE

 

Anti-Lock Brake System

 

DRIVER UNLCK

 

Power Door Lock Relay (Driver's Door Unlock Function)

 

IGN 0

 

TCM

 

TBC IGN 0

 

Truck Body Controller

 

VEH CHMSL

 

Vehicle and Trailer High Mounted Stoplamp

 

LT TRLR ST/TRN

 

Left Turn Signal/Stop Trailer

 

LT TRN

 

Left Turn Signals and Sidemarkers

 

VEH STOP

 

Vehicle Stoplamps, Brake Module, Electronic Throttle Control Module

 

RT TRLR ST/TRN

 

Right Turn Signal/Stop Trailer

 

RT TRN

 

Right Turn Signals and Sidemarkers

 

BODY

 

Harness Connector

 

DDM

 

Driver Door Module

 

AUX PWR 2, M/GATE

 

Not Used

 

LCKS

 

Power Door Lock System

 

ECC, TPM

 

Tire Pressure Monitoring System

 

TBC 2C

 

Truck Body Controller

 

HAZRD

 

Flasher Module

 

CB LT DRS

 

Left Power Windows Circuit Breaker

 

TBC 2B

 

Truck Body Controller

 

TBC 2A

 

Truck Body Controller

 

 

 

 

(The ones in BOLD were the ones that were busted)

 

 

 

 

 

 

and the ones under the hood:

 

 

 

Underhood Fuse Block

 

The underhood fuse block in the engine compartment on the driver's side of the vehicle near the battery. Lift the cover for access to the fuse/relay block.

 

To remove fuses hold the end of the fuse between your thumb and index finger and pull straight out.

 

See Engine Compartment Overview for more information on its location.

 

 

 

*1 Fuel Injection Rail #2-Gasoline Engine; Engine Control Module-Diesel Engine.

 

*2 Fuel Injection Rail #1-Gasoline Engine; Actuator-Diesel Engine.

 

*3 Oxygen Sensors-Gasoline Engine; Fuel Heater-Diesel Engine.

 

*4 Oxygen Sensors-Gasoline Engine; Engine Control Module 1-Diesel Engine.

 

*5 Ignition 1-Gasoline Engine; Engine Control Module-Diesel Engine.

 

*6 Powertrain Control Module B-Gasoline Engine; Engine Control Module B-Diesel Engine.

 

*7 Rear Climate Control.

 

*8 Sunroof.

 

Fuses

 

Usage

 

GLOW PLUG

 

Diesel Glow Plugs and Intake Air Heater

 

CUST FEED

 

Gasoline Accessory Power

 

HYBRID

 

Hybrid

 

STUD #1

 

Auxiliary Power (Single Battery and Diesels Only)/ Dual Battery (TP2) Do not install fuse.

 

MBEC

 

Mid Bussed Electrical Center Power Feed, Front Seats, Right Doors

 

BLWR

 

Front Climate Control Fan

 

LBEC

 

Left Bussed Electrical Center, Door Modules, Door Locks, Auxiliary Power Outlet--Rear Cargo Area and Instrument Panel

 

STUD #2*

 

Accessory Power/Trailer Wiring Brake Feed

 

ABS

 

Anti-lock Brakes

 

VSES/ECAS

 

Vehicle Stability

 

IGN A

 

Ignition Power

 

IGN B

 

Ignition Power

 

LBEC 1

 

Left Bussed Electrical Center, Left Doors, Truck Body Controller, Flasher Module

 

TRL PARK

 

Parking Lamps Trailer Wiring

 

RR PARK

 

Right Rear Parking and Sidemarker Lamps

 

LR PARK

 

Left Rear Parking and Sidemarker Lamps

 

PARK LP

 

Parking Lamps Relay

 

STRTR

 

Starter Relay

 

INTPARK

 

Interior Lamps

 

STOP LP

 

Stoplamps

 

TBC BATT

 

Truck Body Controller Battery Feed

 

SEO B2

 

Off-Road Lamps

 

4WS

 

Not Used

 

AUX PWR

 

Auxiliary Power Outlet -- Console

 

PCM 1

 

Powertrain Control Module

 

ETC/ECM

 

Electronic Throttle Control, Electronic Brake Controller-Gasoline Engine, Fan Clutch-Diesel Engines

 

IGN E

 

Instrument Panel Cluster, Air Conditioning Relay, Turn Signal/Hazard Switch, Starter Relay

 

RTD

 

Ride Control

 

TRL B/U

 

Backup Lamps Trailer Wiring

 

F/PMP

 

Fuel Pump (Relay)

 

B/U LP

 

Back-up Lamps, Automatic Transmission Shift Lock Control System

 

RR DEFOG

 

Rear Window Defogger

 

HDLP-HI

 

Headlamp High Beam Relay

 

PRIME

 

Not Used

 

AIRBAG

 

Supplemental Inflatable Restraint System

 

FRT PARK

 

Front Parking Lamps, Sidemarker Lamps

 

DRL

 

Daytime Running Lamps (Relay)

 

SEO IGN

 

Rear Defog Relay

 

TBC IGN1

 

Truck Body Controller Ignition

 

HI HDLP-LT

 

High Beam Headlamp-Left

 

LH HID

 

Not Used

 

DRL

 

Daytime Running Lamps

 

RVC

 

Regulated Voltage Control

 

IPC/DIC

 

Instrument Panel Cluster/Driver Information Center

 

HVAC/ECAS

 

Climate Control Controller

 

CIG LTR

 

Cigarette Lighter

 

HI HDLP-RT

 

High Beam Headlamp-Right

 

HDLP-LOW

 

Headlamp Low Beam Relay

 

A/C COMP

 

Air Conditioning Compressor Relay

 

A/C COMP

 

Air Conditioning Compressor

 

TCMB

 

Transmission Control Module

 

RR WPR

 

Not Used

 

RADIO

 

Audio System

 

SEO B1

 

Mid Bussed Electrical Center, Rear Heated Seats, Universal Home Remote System

 

LO HDLP-LT

 

Headlamp Low Beam-Left

 

BTSI

 

Brake Transmission Shift Interlock System

 

CRNK

 

Starting System

 

LO HDLP-RT

 

Headlamp Low Beam-Right

 

FOG LP

 

Fog Lamps Relay

 

FOG LP

 

Fog Lamps

 

HORN

 

Horn Relay

 

W/S WASH

 

Windshield Washer Pump Relay

 

W/S WASH

 

Windshield Washer Pump

 

INFO

 

OnStar®/Rear Seat Entertainment

 

RADIO AMP

 

Radio Amplifier

 

RH HID

 

Not Used

 

HORN

 

Horn

 

EAP

 

Not Used

 

TREC

 

Not Used

 

SBA

 

Supplemental Brake Assist

 

 

 

 

 

 

I know because I tried to install a powered taillight converter and ended up shorting out all of those fuses...if that all checks out, you are gonna have to get under the truck and have someone in the driver's seat change signals, hit the brake, turn on the lights while you probe the wires that run from the cab under the bed to the OEM outlet (before the 7 way split)

[SafetyMan]

ALL of the DOT lighting functions properly.

 

Stop, turn, and parking.

[jrrod2004]

they test on the rear harness??? and at the 7 way with a tester?

[jrrod2004]

if so, then I would say bad connection on the harness somewhere

[jrrod2004]

that 12V post can be a bitch to figure out....mine works (walked to the truck and just tested it)

[SafetyMan]

Everything tests on the test light at the 7-way...

 

EXCEPT the + 12v.

 

Trailer brakes

R. Turn

L. Turn

Taillights

Aux/backup

 

 

 

I could change the Interior lights on the trailer to work with the Taillights.

 

It would SOLVE my problem, but not FIX the problem.

[jrrod2004]

naw, I wouldnt do that unless you really felt comfortable....

[jrrod2004]

can anyone else chime in as to their thoughts....i am at a loss of words

[SafetyMan]

I am quite adept at 12v wiring.... changing the trailer wiring is no big deal.

 

I really want the Silverado to be correct though.

 

My 04 F350 works properly.

 

 

 

I don't want to tear too deep into the truck, maybe a dealer fix?

[2004GMC1500CC]

I am quite adept at 12v wiring.... changing the trailer wiring is no big deal.

 

I really want the Silverado to be correct though.

 

My 04 F350 works properly.

 

 

 

I don't want to tear too deep into the truck, maybe a dealer fix?

 

does it matter if the key is in the ignition or not?

[SafetyMan]

The key has to be "ON" for the turn signals to function.

 

I tested with the key on and the truck running.

[jrrod2004]

yeah, thats how I blew almost every fuse, it was on and running and I crossed the ground with one of the turn signal wires (stupid...I know)

[SafetyMan]

I don't mean to sound snippy...

 

I truly appreciate all of the input.

 

I'm sure this is a simple something I'm missing.... just frustrated.

 

Been working on this for 2 1/2 days now, I'm at the end of my patience with it.