No Signal or Function on Trailer Harness on a 2007 Acura MDX
Updated 12/01/2009 | Published 11/30/2009
Question:
I have a 2007 Acura MDX with the #118424 wiring harness. This weekend I hitched to a friends trailer, evidently there was a short in the trailer wiring and the lights stopped working. I now do not have any power for lights in my traler wiring harness, can you tell me what fuse feeds the plug?
asked by: Jerry M
Expert Reply:
As far as I can tell, one of two things has happened. Either the tow wiring fuse has blown or the Modulite box on the harness has burned up. A short on the trailer could cause either of these and both would lead to no signals at the connector. I will walk you through a process to diagnose which is the root of the problem.
Using a circuit tester, like part # PTW2993, go to the back of the vehicle where the harness is attached. Un-plug the trailer harness and check the pins on the vehicle connector. Match the colors on the harness pins to the pins on the vehicle connector. Red is brake light, green is passenger side turn, yellow is driver side turn, black is power, and brown is taillights. If these pins are not working, then the fuse for the tow harness circuit is blown. You will need to consult your vehicle owner manual to figure out where this fuse is. There may be a fuse block behind a panel or cover in the driver side foot box and there are probably 1 or 2 more fuse blocks inside the engine bay. Sometimes the back sides of fuse block covers have a diagram of which fuse does what.
If you have power at vehicle connector, but not at the 4-Pole trailer connector, then chances are the trailer caused a short than burned up the Modulite converter instead of letting the signal feed back into your vehicle circuits and do damage there. The way to test is to check to see if signal is coming into the Modulite from the vehicle side and if it is going out of the box on the trailer side. I have included a link to a video showing how to test a Modulite.
Product Page this Question was Asked From
Featured Help Information
Miscellaneous Media
Continue Researching
- Shop: Trailer Wiring
- Shop: Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector
- Article: Trailer Wiring Diagrams
- Search Results: trailer hitch
- Shop: Trailer Hitch
- Video: How to Choose a Trailer Brake Controller
- Q&A: What is the Difference Between a Class II and a Class III Hitch?
- Shop: Universal Installation Kit for Trailer Brake Controller - 7-Way RV and 4-Way Flat - 10 Gauge Wires
- Search Results: trailer wiring
- Video: Curt T-Connector Vehicle Wiring Harness Review C56040
- Q&A: What is the Difference Between a 4-Way and 7-Way Trailer Connector
- Article: Brake Controller 7- and 4-Way Installation Kit (ETBC7)
- Article: How to Measure for Trailer Hitch Drop
- Shop: Suspension Enhancement
- Shop: Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector
- Q&A: Lug Nut Torque Chart for Trailer Wheels
- Search Results: trailer tires and wheels
- Shop: etrailer Anti-Rattle Hitch Collar for 2" Hitch Receivers
- Shop: Brake Controller
- Search Results: trailer hitch ball mount
- Article: Wiring Trailer Lights with a 7-Way Plug (It's Easier Than You Think)
- Video: Clean Up Your Trailer Wiring
- Q&A: Installation Time for Blue Ox BX1128 Flat Tow Base Plate Kit for 2016 Jeep Grand Cherokee
- Shop: etrailer Trailer Hitch Receiver - Custom Fit - Matte Black Finish - Class III - 2"
- Q&A: How to Replace a Lance 6-Pin Plug w/ a Standard 7-Way Connector
- Article: How to Choose the Right Trailer Hitch Class
- Shop: Fifth Wheel Hitch
- Search Results: trailer lights
- Video: What to Know About the Curt TriFlex NEXT Trailer Brake Controller
- Article: The 5 Best Trailer Drop Hitches You Can Buy
on Automotive Tools
