Troubleshooting No Running Lights on 7-Way Square Plug for 2000 Ford F-350 Super Duty
Question:
Ive got the same problem but on a 2000 F350. All fuses good under the hood #4, #8, and #28. So with all of that done I went to the trailer plug on the truck still no trailer running lights. Under the hood under the break booster on fender well are 4 plugs 2 to transmission and the other 2 are for the Turn, Break, Stop Lamps and Ect.... on the truck and the other is for the Turn, Break, Stop Lamps and Ect.... for when the trailer is plugged into the truck providing trailer with lights Ect.... So I unplugged the 4th plug from the left located on fender well below break booster and fuse box. This plug sends power ect to the 7 pin trailer plug on back of truck. I then used an Ohm meter and a very long wire to test each of the pins of the 7 pin plug and the male plug under the hood which all tested good. So now I know which pin in the male plug operates the trailer running lights. The test on the pin which operates the trailer running lights in Female plug has no power whatsoever going to the trailer running lights when truck park lights are on with the key on or off. So now where and what do i trouble shoot. BTW I replaced the hard to reach Blinker Relay under the dash to the right of the steering column. Need help Thanks
asked by: 4-Barrel H
Expert Reply:
Thank you for all of the details! Troubleshooting trailer lights can be frustrating and it sounds like you've already put in a lot of effort.
If the connector sending the signals on the truck side has all of the functions active and operating properly then you can simply replace the factory 7-Way connector on your 2000 Ford F-350 Super Duty with either the Tow Ready # 118243.
If the problem is that the square connector for the trailer functions on your F-350 ISN'T sending power then there are 2 possible solutions; you can either cut off the square connector that goes to your 7-Way and splice in those wires to the OEM wires on your truck using butt connectors # DW05744-10 and # DW05745-5 OR you can potentially tee in the Hopkins 7-Way # HM40157 to that other square connector that carries the same functions. Just note that this will cause extra draw on those circuits.
Aside from that you'd need to take your pickup to a shop or dealer and have them run replacement wiring for the factory side of the connection between the fuse box and that square plug.
(click to enlarge)
Products Referenced in This Question
Deka Heat Shrink Butt Connector - 16-14 Gauge - Nylon Insulation - Blue - Qty 10
- Wiring
- Wire Connectors
- Butt Connectors
- 16-14 Gauge
- Deka
more information >
Deka Heat Shrink Butt Connector - 12-10 Gauge - Nylon Insulation - Yellow - Qty 5
- Wiring
- Wire Connectors
- Butt Connectors
- 12-10 Gauge
- Deka
more information >
Hopkins Endurance 5th Wheel/Gooseneck 90-Degree Wiring Harness with 7-Pole Plug
- Custom Fit Vehicle Wiring
- Fifth Wheel and Gooseneck Wiring
- 10 Feet Long
- Custom Fit
- 7 Round - Blade
- Hopkins
more information >
Product Page this Question was Asked From
Ford Replacement OEM Tow Package Wiring Harness, 7-Way (Super Duty)
- Custom Fit Vehicle Wiring
- Trailer Hitch Wiring
- No Converter
- Custom Fit
- 7 Round - Blade
- Tow Ready
more information >
Featured Help Information
Instructions
Continue Researching
- Shop: Trailer Wiring
- Shop: Hopkins Endurance 5th Wheel/Gooseneck 90-Degree Wiring Harness with 7-Pole Plug
- Shop: Curt 5th Wheel/Gooseneck Custom Wiring Harness w/ 7-Pole Connector - 7' Long
- Shop: Hopkins Endurance 5th Wheel/Gooseneck 90-Degree Wiring Harness with 7-Pole Plug
- Shop: Hopkins Endurance 5th Wheel/Gooseneck 90-Degree Wiring Harness with 7-Pole Plug
- Search Results: c56070
- Video: Hopkins Custom Fit Vehicle Wiring - Fifth Wheel and Gooseneck Wiring - HM40157 Review
- Shop: Pollak 5th Wheel / Gooseneck T-Connector with 7-Pole - Ford, GM, Dodge, Nissan w/ Factory Plug
- Search Results: 7 pin in bed connector
- Article: Brake Controller 7- and 4-Way Installation Kit (ETBC7)
- Video: Choosing the Right Trailer Wiring
- Shop: 7- and 4-Pole Trailer Connector Socket w/ Mounting Bracket - Vehicle End
- Search Results: 44649
- Shop: Trailer Hitch
- Q&A: Recommended Lithium Battery Compatible Power Converter For Parallax 7355
- Search Results: 68149
- Video: B and W Turnoverball Gooseneck Trailer Hitch Installation - 2022 Ford F-250 Super Duty
- Shop: Brake Controller
- Q&A: Damaged Caused to Travel Trailer Brake Drums and Bearings by High Temperatures
- Article: Trailer Wiring Diagrams
- Shop: Tekonsha Prodigy P3 Trailer Brake Controller - 1 to 4 Axles - Proportional
- Shop: Fifth Wheel Hitch
- Search Results: 25580
- Video: Draw-Tite Max-Frame Trailer Hitch Installation - 2019 Chevrolet Equinox
- Q&A: Trailer Grease Seal to Replace 127194TB
- Article: How to Choose the Right Trailer Hitch Class
- Shop: Gooseneck Hitch
- Q&A: Recommended Replacement Grease Seal for 2014 Shorelander Boat Trailer
- Article: Wiring Trailer Lights with a 7-Way Plug (It's Easier Than You Think)
- Video: Tekonsha T-One Vehicle Wiring Harness Installation - 2020 GMC Terrain 118764
on Custom Fit Vehicle Wiring
