What is the 5th wire for on a trailer plug?

The 5th wire on a 5-Way flat connector is intended to connect to the vehicle’s reverse light circuit. This is for the exact situation you described, so the 5th wire can signal a surge coupler’s electric reverse lockout.

Can I use wd40 on trailer plug?

DO NOT use the original WD-40 spray on your trailer plug. The original petroleum-based WD-40 spray will often attack rubber parts and cause them to deteriorate. And don’t use Vaseline for much the same reason. It’s petroleum based, which will eventually break down the rubberized parts of your plug.

Should I use dielectric grease on trailer connections?

Dielectric grease is used to keep moisture out of the electrical connections on your wiring and to inhibit corrosion. Typically applied to permanent connections, it also can be useful with temporary electrical connections, for example, with infrequent towing.

Can you plug a 4 pin into a 5 pin trailer plug?

If the 4-pole and 5-pole connectors on your vehicle and trailer are the flat style connectors, then you could simply plug the 4-pole trailer connector into the 5-pole vehicle connector. If you did not want to add trailer brakes, then you could simply tie off the brake wire and tuck it away.

Why does my 4 prong trailer plug have 5 wires?

Replacement 4-Pole Trailer Connector for Utility Trailer with 5-Wire Wishbone Wiring Setup When a 4-pole (4-pin) flat trailer connector actually has 5 wires this simply means it is a ‘wishbone’ style connector with dual running light wires.

Should I grease my trailer plug?

9. Also, use any form of grease to keep the trailer contacts well greased. The grease prevents corrosion, and keeps oxygen out of the connector to prevent moisture and its ensuing corrosion of the terminals.

How do you fix a 7-pin trailer plug?

How to Fix 7-Pin Trailer Cord

  1. Step 1: Remove old plug. Step 2: Replace with better plug.
  2. Cut off the old plug and expose wires.
  3. Remove shielding from all wires.
  4. Insert cord into plug and attach center wire.
  5. Connect cord wires to plug terminals.
  6. Seal plug assembly.
  7. Secure plug housing.
  8. Test your new plug.

Can you use Vaseline on electrical connections?

Further, Petroleum jelly has good electrical conduction property that can be used widely in electrical applications. Vaseline is mostly used in beauty care but has its prominence in industrial applications too. It is extensively used in the protection of metals and found as a good lubricating agent.

Can you wire a trailer with a 5 wire harness?

A trailer with a 5-wire harness has connections for marker, brake and signal lights as well as an electric braking system. By reducing a 5-wire to a 4-wire you eliminate the connection for the trailer’s brakes.

How does a 5 pole trailer plug work?

Standard, 5-pole plug connects trailer to socket on tow vehicle Minimum voltage drop and maximum current capacity are ensured Establish a secure connection between your trailer and tow vehicle with this chrome-plated, 5-pole plug. Split brass pins ensure minimum voltage drop, and pull grips enable easy insertion and removal.

When to change from 5 wire to 4 wire trailer?

By reducing a 5-wire to a 4-wire you eliminate the connection for the trailer’s brakes. If your trailer is significantly heavy and is at the upper limits of the towing capacity of the vehicle, it is recommended that you upgrade the vehicle to a 5-wire harness.

Where can I buy Pollak round pin trailer wiring?

Split brass pins ensure minimum voltage drop, and pull grips enable easy insertion and removal. Lowest Prices for the best wiring from Pollak. Pollak 5-Pole, Round Pin Trailer Wiring Connector – Chrome – Trailer End part number PK11501 can be ordered online at etrailer.com or call 800-298-1624 for expert service.