How To Replace 4-Way Flat On Trailer That Has 7 Wires To It

Question

Question:

My boat trailer has a 4 prong flat connector with 7 wires that needs to be replaced but I can only find a 4 way flat with 5 wires .. how do I wire this up

asked by: Stan

0

Expert Reply:

When a 4 flat connector on a trailer has 7 wires it usually means it either has extra grounds or extra tail light wires. Most likely if the extra wires are white then it is ground, if they are brown then they are most likely tail light wires. The only way to know this for sure it to test the wires for function using a 12V battery and a jumper wire. Touch one end of the jumper wire to the positive post of the battery, the touch the other end of the wire to all of the different wires to see what circuit illuminates. Make sure you ground the wire that you know is a ground before testing.

If it turns out you have extra ground wires on the 4-flat then you can use a standard Wesbar 4-Pole Flat Connector w/ Jacketed Cable - Trailer End - 4' Long part # W787264 on the trailer and combine the grounds to the ground wire (white) on the connector. If it turns out the extra wires are tail light wires, the easiest way is to use 35 Ft 4-Way Trailer Wiring Harness - Wishbone Style - 42" Ground part # A35W42B and combined the running light wires to the 2 brown tail light wires on the wishbone.

expert reply by: Heather A

0

Answer 1

Sounds like each of the taillight circuits on your 4-way have a two wires ran to them for each side of the trailers wiring. This is pretty common and what you can do is wire the two wires of each pin to the single wires of a new 4-way like the…

view full answer...

Answer 2

From the information that you have given, I suspect that you have some additional ground wires on your trailer. Without being there to actually see the trailer, my best recommendation would be to wire the connector as follows: Green to Green for…

view full answer...

Answer 3

Since this is on a boat trailer the 2 additional white ground wires are ground for the lights. This is fairly common on aluminum frames and boat trailers in general because aluminum is a poor metal for grounds and lights grounded near the tail lights…

view full answer...

Answer 4

The difference between the Class II and Class III hitches has to do with their Gross Trailer Weight (GTW), their Tongue Weight (TW), and their Hitch Receiver Size. Class II trailer hitch receivers have a 1-1/4 inch receiver and can be rated up to…

view full answer...

Answer 5

In order to determine the torque rating for the lug nuts on your trailer you will need to know check out the chart I attached that shows all of the torque specs for all the trailer lugs available based on stud size, wheel material and wheel size.

view full answer...

Answer 6

A 4-Way trailer connector has the basic lighting functions only; running lights, left turn signal and brake lights, right turn signal and brake lights, and ground. A 7-Way has these functions and a 12 volt circuit, a circuit for electric trailer…

view full answer...

Answer 7

According to Blue Ox, it'll take an experienced installer about 4 to 5 hours to complete the installation of their #BX1128 Base Plate Kit on a 2016 Jeep Grand Cherokee. The install isn't what I'd call super-difficult, but the installation…

view full answer...

Answer 8

Hi Paul, you’re definitely on the right track here, and I can help you narrow this down with confidence. With your tandem 3,500 lb Dexter axles and 33 inch spacing, both the Dexter EZ Flex part #K71-652-00 and the Lippert Road Armor part #LC53CK are…

view full answer...

Answer 9

It sounds like you are speaking of the wires for the brake magnets. If this is correct, you will need to connect one of the wires to the brake controller output wire on your trailer connector and the other wire will need to be grounded to a clean…

view full answer...

Answer 10

The #84 spindle is just a common way to identify the spindle dimensions typically used for 3,500 lb axles. So instead of listing out the parts, people can just say they have #84 spindles and it's easier to know what fits it. The CE Smith Trailer…

view full answer...

Answer 11

Even though I cannot comment specifically on the grease you used because I am not familiar with it, I can tell you the best grease for trailer bearings is a a grease with a rating of GC-LB, which just means it is made to withstand very high…

view full answer...

Answer 12

The 5.30-12 tires, being wider, are going to make more contact with the road. This means that the noise, and heat build up will be higher than a 4.80-12 tire but the rolling resistance will actually be less because the tire is larger diameter. The…

view full answer...

How To Replace 4-Way Flat On Trailer That Has 7 Wires To It

Products Featured in This Question

Continue Researching