Curt Manufacturing 58957 Installation Manual Download Page 3

58957-INS-RA

  

  

05/29/2020

  

  

PAGE 3

Step 6

Repeat Step 5 on the passenger side using the RV harness end with the green wire. 

From under the rear bumper, zip-tie as needed. Do not completely tighten, allowing for adjustment later.

Step 7

Locate a suitable grounding point near the connector such as an existing screw with nut in the vehicle frame or drill a 3/32" pilot hole for the 

provided screw. The area should be free of rust, dirt and paint. Secure the white ground wire using the ring terminal and provided screw.

CAUTION

 

Check for miscellaneous items that may be hidden behind or under any surface before drilling to avoid damage and / or personal injury.

Step 8

Connect the taillights to the custom harness. This is for testing purposes only and the taillights should be removed once this test is complete. 

NOTICE

 

Once the RV harness is installed, verify that the harness is functioning by attaching the 4-way flat to any vehicle with functioning 

taillights. The taillights on the vehicle to be towed should function along with the taillights on the vehicle that is powering them.  

Step 9

If all functions test out, reinstall all removed items.

Step 5

On the driver side, with the taillight removed, 

use a fishwire to drop down through the 

opening so the fishwire comes out the 

underside of the vehicle.

Locate the end of the RV harness with the 

yellow wire and route it up through the opening 

of the removed taillight. Insert the RV harness 

end with yellow wire between the separated 

connectors. Make sure the connectors are 

fully inserted with locking tabs in place.

How to Fishwire

A)

 Fish wire is a way to push or pull 

an electrical wire through a blind hole. 

Make sure the wire is long enough 

to stick out on the other side.

Insert the fish wire through the blind 

hole and locate it on the other side.

B) 

Use tape to secure the harness 

to the fish wire and pull back up. 

The fish wire or harness may get hung up on 

something, if this happens you may have to 

push back down, wiggle it around or twist the 

wire to loosen it from what it's hung up on.

Fish wire could be anything from a cut-up wire 

hanger, stiff wire, rope or string depending on 

what is needed for the installation.

A

B

A

B

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