Troubleshooting GMC Truck that Left Turn Signal on 7-Way Stopped Functioning
Updated 08/17/2020 | Published 07/03/2015
Question:
2006 GMC 3500 dura max - boat trailer lights work except left turn , left turn on truck works but no power at 7 way for left turn power there for every thing else ???
asked by: Jack O
0
Expert Reply:
Since you have isolated the problem down to the left turn signal on the 7-way on your vehicle the problem is most likely a blown fuse under the hood of your 2006 GMC Sierra 3500. GM vehicles tend to blow fuses easier than the other manufacturers.
Check the fuse box under the hood of your engine on the driver side for the trailer related circuits and replace as needed.
I attached a couple help articles for you to check out as well.
expert reply by:
Jameson C
0
Featured Help Information
Miscellaneous Media
Continue Researching
- Shop: TowSmart 7-Way Molded Trailer Wire Connector - 72" Long
- Shop: Trailer Wiring
- Video: A Closer Look at the TowSmart Trailer Connector Adapter
- Video: TowSmart ProClass Plug-In Trailer Connector Adapter Review - Quick & Easy Connection
- Shop: TowSmart 7-Way RV Style to 4-Flat or 5-Way Flat Trailer Connector Adapter
- Video: Review of TowSmart Custom Fit Vehicle Wiring - ProClass Plug In Trailer Adapter With Tester - TS89RR
- Video: Review of TowSmart Custom Fit Vehicle Wiring - Wiring Adapters - TS32ZR
- Shop: TowSmart ProClass Plug-In Trailer Connector Adapter w Wire Tester, Ergo Grip - 4-Way Flat to 7-Blade
- Shop: TowSmart Plug-In Trailer Connector Adapter w/ Wire Tester - 4-Way Flat to 7-Blade
- Shop: TowSmart Trailer Connector Adapter w/ LED Illuminator - 7-Wire to 4-Wire Flat
- Video: Curt 7-Way to RV Socket LED Circuit Tester Review
- Video: 2020 Volvo XC60 Curt Trailer Connector Adapter: Complete Installation
- Video: In-Depth Review of the Curt 7-Way to RV Socket LED Circuit Tester
- Shop: Pollak 7 Pole to 4 Way Connector Adapter
- Shop: Mighty Cord Trailer Connector Adapter - 4-Way Flat to 7-Way RV Style - 12" Long
- Shop: Front Mount Hitch
- Q&A: Install Video for Pollak 12-705 7-Way Trailer Wiring
- Article: Trailer Wiring Diagrams
- Article: Brake Controller 7- and 4-Way Installation Kit (ETBC7)
- Article: Wiring Trailer Lights with a 7-Way Plug (It's Easier Than You Think)
- Q&A: What is the Difference Between a 4-Way and 7-Way Trailer Connector
- Article: How to Choose the Right Trailer Hitch Class
- Article: Brake Controller Installation: Starting from Scratch
- Q&A: What is the Difference Between a Class II and a Class III Hitch?
- Q&A: My Vehicle has a 4-Pin Trailer Plug, but Trailer has 7-Pin Trailer Plug
- Article: How to Measure for Trailer Hitch Drop
- Q&A: 2025 Kia Sportage PHEV
- Article: Wiring Trailer Lights with a 4-Way Plug (It's Easier Than You Think)
- Q&A: Availability of Victron DC/DC Battery Charger With Lithium Compatibility and Engine On Detection
- Q&A: How to Add a 7-Way Connector to a 2015 Ford Transit T250
Explore Expert Info
![Our Expert]()
on Custom Fit Vehicle Wiring
on Custom Fit Vehicle Wiring
Jack K.
7/29/2020
Unique problem, when left turn is on [2007 GMC Sierra Crew] right turn is faintly on at trailer. [LEDS on Trailer] Changed 7 pin and junction piece on frame near hitch. Does the same on another trailer with LEDS. When left turn is on measured 4-6 volts at right turn side of 7 pin.