Upgrading the wiring on the Expy from 4-wire to 7-wire and I was wondering about the blue wire taped to the wiring. If I connect it for 7-wire use will I still have to get and install a separate brake controller?
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The blue wire should be back-up lights.
If you have surge brakes on the trailer the back-up light wire will stop the brakes from locking up when you back it up.