FJ60 and 4 flat wire trailer wiring

[JamesR]

Hello Everyone,

I have a 1986 Toyota Land Cruiser FJ-60. I found this connector already wired to the vehicle lights. As you can see on the vehicle side of the module there are 4 wires, white, yellow, red, and green. On the trailer side of the module there are also 4 wires, white, black, black, white. I wired the 4 flat trailer wire matching the color on the vehicle side of the module to the four colors of the flat trailer wiring. So, I connected the white trailer wire to the white wire coming out of the module, the yellow trailer wire to the black wire coming out of the module, the brown wire (since the 4 flat wire doesn't have a red) to the second black wire coming out of the module, and the green trailer wire to the other white wire coming out of the module. This is incorrect because the only trailer light that worked was the left turn signal. The brake lights may have worked. I don't know because I couldn't press the brake pedal and view the lights simultaneously. Please help me out.

Thanks.

 

[Stoshu]

James,

I'm in the process of installing a trailer wiring harness as well and came across this:
https://forum.ih8mud.com/threads/4-wire-trailer-plug-and-play-kit.846827/
Hope it helps.

 

[rusty_tlc]

I went to the local trailer place and told them what I needed to do, they sold me something like this;
http://www.curtmfg.com/part/56175 the price on that one seems high, it's just an example.
I've done the light on my 75, 84 and 98 Land Cruisers, works every time.

 

[rusty_tlc]

http://www.etrailer.com/t1-1986_Toyota_Land+Cruiser.htm

Get one of these and don't screw with whatever the PO kludged in.

 

[ntsqd]

I've never had one of those solid state converters last more than a couple of years. Somewhere around here is the schematic for the relay circuit that I use instead. 5 standard Bosch type "sugar cube" relays and a 30A breaker in a waterproof project box from Allied Electronics. Does require a power wire at the rear of the vehicle, but I'd already done that for other uses.

 

[Living in the Past]

I went to the local trailer place and told them what I needed to do, they sold me something like this;
http://www.curtmfg.com/part/56175 the price on that one seems high, it's just an example.
I've done the light on my 75, 84 and 98 Land Cruisers, works every time.

http://www.etrailer.com/t1-1986_Toyota_Land+Cruiser.htm

Get one of these and don't screw with whatever the PO kludged in.

Do either of these require cutting into the factory wiring? I won't cut into factory wiring. Last summer I undid the original owner's trailer wiring on my 70 FJ40. I used bullet connectors from Coolerman so I just unplug factory connectors to install the wiring.

Asked this in the 60 section without any answer, are the plugs the same on a FJ62 as the plugs in the FJ60 so the Hopkins kit can be used. Thought about making a custom kit with relays but have some many vehicles it's easier to just use LED bulbs on the trailer. Custom wired the trailer so it's overkill and with LED bulbs I shouldn't have a problem not using a separate 30 amp power source. On my FJ62 I used those clip on connector that cut the insulation and not the wire. Been working since I installed in 1993 but would rather do it right if I can find a kit with the right plugs. In all that time I don't remember ever having to replace the solid state convertor.

 

[rusty_tlc]

I cannot remember if I cut into the wiring on the FJ60 or not.

 

[Stoshu]

I just got my Hopkins 43315, which is the "T" type plug and play kit for Toyota pickup's and early Taco's. I plan on checking out the wiring and relocating the pins in the Hopkins harness to work with my 60. The plugs and sockets appear to be the correct match, but I know for sure that the wiring locations are different from the trucks to the 60. I will try to document everything and post up some pictures when I dig into it this weekend.

 

[Living in the Past]

I would be curious which side the main harness go on. I used a Hopkins kit to repair the port installed trailer wiring on my 99 4Runner. The port installed convertor installed on the driver's side and the Hopkins kit installed it on passenger's. I rewired the kit so the convertor stayed on the driver's side which has more room. I also torn the port installed convertor apart and made a convertor to retain the port installed four pin pigtail. If I ever find port style convertor I can switch back. But that's just me I'm anal that way.

Would be curious to see a picture of the plugs on this kit so I can see if they look like the ones in my FJ62.

 

[JamesR]

Here's an update:

Hopkins “plug & play” wiring harness for a 4 flat wire trailer harness

Here’s a table of the wiring information. (The information in the first 3 columns were provided by Stoshu. Another forum member.)

Hopkins FJ 60 Function Plug position
White Brown Ground 4
Brown Red/green Tail Light 1
Red Green/white Brake lights 2
Yellow Green/yellow Left turn signal 3
Green Green Right turn signal Not used on this plug
Not used Red/blue Back up lights 5
Not used Not used NA 6

60 Driver’s side harness plug connector positions
5 3 1
6 4 2

This view is looking at the “connector” side. You’ll need to remove the connectors from both of the Hopkins plugs to match this pattern.

1 = tail light; 2 = brake light; 3 = Left turn signal; 4 = Ground; 5 = Back up light; 6 = not used

60 Passenger’s side harness plug
5 3 1
6 4 2

This view is looking at the “connector” side. You’ll need to remove the connectors from both of the Hopkins plugs to match this pattern.

1 = tail light; 2 = brake light; 3 = Right turn signal; 4 = Ground; 5 = Back up light; 6 = not used

You’ll only need to remove 2 connectors on the passenger side connector.

The Hopkins plug has the green wire at position 1. You’ll need to change/swap the right turn signal connector from position 1 to position 3 and the black wire that is in position 3 to position 1. All of the other wires are black and none of them will need to be changed.


On a traditional 4 flat wire harness, the brown wire is for brake and tail light. The Hopkins harness uses the brown wire for the tail lights and the green and yellow wires for the brake lights.

 

[tpromano]

In case anyone digs up this thread looking for answers on the black box, as I did....
My FJ60 has the same black box installed with identical wiring to and from the box.

Schematic orientation: Looking at black box with wires from truck on top, and wires to trailer connector on bottom:
[White_1| Yellow | Red | Green]
[---------Black Box-----------]
[---------Black Box-----------]
[White_2 | Black_1 | Black_2 | White_ 3]

I found the following:
- Green wire coming from the truck in line with White_3 is ground;
- White_1 wire coming from the truck in line with White_2 is running/brake;
- Yellow wire coming from truck to Black_1 turned on for both left and right blinker;
- Red wire coming from truck to Black_2 turned on for both left and right blinker;

Since both the Yellow and Red wire output an "on" signal for either left or right turn signal, you are free to pick either Black_1 or Black_2 to route to the 4 Flat connector wires.

I bought the $9.99 Hopkins 4 Flat connector and wired it up. The wires were labeled as follows:
- White_hopkins = Ground
- Brown_hopkins = Parking/Brake signal
- Yellow_hopkins = Left Turn signal
- Green_hopkins = Right Turn signal

[White_1 | Yellow | Red | Green ]
[---------------Black Box------------------]
[---------------Black Box------------------]
[ White_2 | Black_1 | Black_2 | White_ 3 ]
[ Solder | Solder | Solder | Solder ]
[ Brown | Yellow | Green | White_4 ]

Difficult to capture everything in one pic but best attempt below..