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If it's charging at all times except when in tow, it sounds like either a fuse or loose connection. Check your wiring diagram to see if there is an in-line fuse and to see where this wire terminates. Hook up your vehicle and see if you have 12v where it terminates. It should be easy to troubleshoot at that point.
__________________ Sterling - 1972 Sovereign Intl (RB) Eddie - 2003 Ford Excursion (6.0L PSD) Prodigy Brake Controller / Equal-i-zer Hitch / Honda EU2000i x2 Airstream Life Contributor WBCCI 4CU #5661/AIR #5661 My Refurb Blog: UPDATED!! http://mellomikesairstreams.blogspot.com/ Part wanted: 70s Kitchen Counter Unit |