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Trailer Hitch Installed and Lights Go Haywire

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We’ve all heard  horror stories about how add-on equipment can cause unexpected and hard to resolve problems elsewhere in the electrical system. Here’s a great case study where that exact problem happened and how the root cause of the problem was found and resolved. In this case, John from California was trying to resolve a 2017 Jeep Cherokee Trailhawk with issues with rear light operation after a trailer hitch and trailer light wiring were installed.

In this case study, John walks through his diagnostic process in detailed fashion, complete with scope captures, showing how he verified the source of the problem prior to replacing any parts. As one commenter stated in relation to vehicle sensitivity to add-on parts: “…[These] circuits are not designed to handle such an operation. Simply installing a wrong resistance bulb will freak these “smart lighting” systems out… The old days of simple electrical circuits have long past. We are in the age of very sensitive electronic circuits.”

To see the original post at https://diag.net, click on the above screen shot or click here. To access complete forum posts or participate in the discussion requires a membership to the site. There are several membership options available, about which you can learn more here.

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Diagnostic Network is an online community of industry professionals and leading industry stakeholders coming together to create the resource to support technicians of today and tomorrow. With your help, we are building a wide, bi-directional communication path between top level diagnosticians and the leading providers of tools, equipment, knowledge, service information, OEMs, and education solutions in order to provide a deeper understanding of the needs and wants of the top level diagnosticians. We hope to inspire the rest of the industry in order to reduce the ever-increasing skills gap. Learn more at Diag.net.

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