Troubleshooting Vehicle 4-Way Harness Having Power On Lights Circuit At All Times 2008 Toyota Tundra
Published 11/04/2022
Products Featured in This Question
Question:
2008 Toyota Tundra 4 wire trailer plug has constant power to the taillights with nothing turned on.
asked by: Jeff
Expert Reply:
If you have a factory 4-way on your 2008 Toyota Tundra you will likely have a short in the factory wiring. You should have a connector like the Hopkins Plug-In Simple Vehicle Wiring Harness # HM11141835 which you can remove to verify if the short is on the factory harness. A Test Light # PTW2993 can be used to check the wiring for shorts and test the pins for the 4-way harness on the factory side of the main harness.
Otherwise you likely have a harness like the Vehicle Wiring Harness Kit # C59496. This is simple to test as you can check the input side of the wiring to verify if it is getting signal and causing power to go to the tail lights on your trailer. As long as you do not have power on the input wires and power coming out the 4-way you know the module is bad and needs replaced.
Product Page this Question was Asked From
Hopkins Plug-In Simple Vehicle Wiring Harness with 4-Pole Flat Trailer Connector
- Custom Fit Vehicle Wiring
- Trailer Hitch Wiring
- Vehicle End Connector
- No Converter
- No Tow Package
- 4 Flat
- Plug and Lead
- Plug-In
- Visible
- Hopkins
more information >
Featured Help Information
Instructions
Continue Researching
- Q&A: What Do The Letters Mean in the ST205/75D15 C Tire Size on My Camping Trailer
- Q&A: How Much Weight Can I Tow With A 2013 Toyota Tundra CrewMax
- Q&A: Does Redarc BCDC Charger Run Wire to Front of Vehicle if Used with Smart Alternator
- Q&A: Will the Curt Trailer Hitch Interfere With a Spare Tire On a 2007 Lexus RX350
- Q&A: What Type of Quick Connect to Use for Blue Wire of Redarc In-Vehicle BCDC Charger
- Q&A: Location of Brake Controller Connector on a 2014 Toyota Tundra
- Q&A: How to Determine if Vehicle Has Smart Alternator for Using REDARC Battery Charger
- Article: Wiring Trailer Lights with a 4-Way Plug (It's Easier Than You Think)
- Article: Brake Controller 7- and 4-Way Installation Kit (ETBC7)