Thank you for the photo! The plug that you found if the "Daytime Running Lights" module and is unfortunately unrelated to the brake controller wiring. Your 2004 Coachmen Sport Elite motorhome is on a Freightliner XC chassis which has no provisions for a brake controller but we do carry the parts you need to install a brake controller.
If you already have a 7-Way installed on your motorhome then you need to route 10 Gauge Wire # 10-1-1 and some Butt Connectors # DW05745-5 from the pin in... view full answer...
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