How To Diagnose Trailer Light Problems. If this is a aluminum trailer.the aluminum skin is the ground. The speed at which you can diagnose problems within circuits is outstanding.
Learn all about trailer wiring testers at HowStuffWorks. Problems that trigger a check engine light are sometimes basic and quick to fix. Video tutorial on how to wire trailer lights.
Article for DIY auto mechanics shows how to diagnose light duty diesels.
So here I have an older trailer which needed some work, along with re-wiring the lights.
To avoid embarrassing situations and to maintain safety, you shouldn't wait till your trailer To troubleshoot the problems with your trailer lights, you have to carry out an all-round test; you might need a multimeter and some cables for this diagnoses. Most all trailer light problems are from a bad ground. In this video I take you through getting the fault codes yourself, without having to go to a mechanic.