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If one installs their own 12V battery manual switch, do connect it the proper way. re: On the positive line. And the emergency brake wiring is connected to the positive post (or, the always live side of the battery switch). Thus, trailer's emergency break away brake switch always works - regardless of 12V manual switch position. If one connects on the 12V negative post and forgets to turn ON before towing, one's trailer will NOT have emergency break away power. This is both dangerous and illegal. Always connect 12V manual battery switch as shown below. As they say, "be safe and legal".
