If you've used a circuit tester like # PTW2993 on the pins of the 4-pole trailer connector provided by the # 118749, then the wiring problem exists on the trailer. In order for none of the functions to work, you probably have a bad ground connection. The ground wire from the trailer connector will typically ground to the trailer tongue. Make sure this connection is secure and made to clean, non-rusted metal. If not, sand the grounding point down to bare metal and install a star washer between... view full answer...
I'd be happy to help troubleshoot this with you.
First off you'll want to remove the electrical tape and wire nut as that is not the correct way to make the connection from the harness to the battery of the Tekonsha 4-way Harness # 118749 you linked to. Instead you'll need butt connectors # DW05745-5 to make that connection, and some crimpers such as # PTW30764 to make sure your connections don't fail like the original.
Once you verify that all of those corrections are secure and correct,... view full answer...
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