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Most likely that black wire is the ground since it`s the only circuit not accounted for and is thicker than the other wires. It`s not uncommon for trailer wiring to not be the standard colors.
Expert Reply: The red wire is the turn signal wire and will be run to the green wire of your harness if its the right turn signal side, and the black wire will run to the brown wire of your harness. The yellow wire from your harness will run to the left turn signal red wire.
Green is for the right turn signal. Yellow is for left turn signal. White is ground, and brown is for the trailer`s taillights. These four types of wires together constitute what is known as “four-way wiring.” Four-way wiring is quite common and is suitable for most light-duty trailers and boat trailers.
Black: Black wires are neutral wires and the wire is connected to a neutral bus bar inside the electrical panel. The bus bar is a conductive piece of metal used for the purpose of distribution. The black wire can be connected to another black wire, and as it is neutral, it does carry a charge.
Here`s a rundown of electrical wires: The black wire is the “hot” wire, it carries the electricity from the breaker panel into the switch or light source. The white wire is the “neutral” wire, it takes any unused electricity and current and sends it back to the breaker panel.
What color wire goes where on a light switch? Because the switch terminals are interchangeable, it doesn`t matter which wire you put on each.
Black wires are “hot” wires. They carry current from the home`s electrical panel to the light, appliance or other device that needs electricity. There`s no NEC requirement that hot wires be black or any other color, but black is the go-to for residential use.
4 Pin Trailer Wiring

Most utility trailers operate on a 4-pin trailer plug for the safety of your vehicle while towing. For the 4-pin, the green wire is for the right turn/brakes, the yellow wire for the left turn/brakes, brown is for the taillights, and white is for the ground.

The brighter connection should be connected to the green (right) or yellow (left) stop/turn circuit, and the dimmer light wire should be connected to the brown running light circuit. The black wire from the trailer connector is usually 12-volt power and the blue wire is for trailer brakes.
Black wires are the accepted standard for any cables that carry electricity from a panel to a service location. You can also have a white wire marked with electrical tape as a hot wire. However, under no circumstances should you have a black wire acting as a ground wire or a neutral wire.
Hot wire is identified by its black casing. This is the main color of hot wire for most homes. However, other hot wires can red, blue, or yellow, although these colors can indicate a different function besides powering an outlet.
Black (neutral) Red (live) Green and yellow (earth)
If you see a black wire, it will almost certainly be hot, and should be treated as such until you can prove that this is not the case. Black wiring has been used for the hot wire for many decades now, so it is unlikely that you will run into an exception to this rule, unless the system was improperly installed.
Another way to identify line and load wires is by their color coding. Line wires are typically black or red, while load wires are usually white.
Black Wires: Hot

Even though you are permitted to use a white wire as a hot wire by marking it with electrical tape, the opposite is not recommended or allowed. In other words, do not use a black wire as a neutral or ground wire, or for any purpose other than for carrying live electrical loads.

In both home and commercial devices, it is common to have ground wires running from each outlet back to one central location (typically near the circuit box), at which point it will connect to a grounding rod. This rod will go directly into the ground so that the electricity can safely exit.
Attaching one of the black jumper cables to the dead battery: When you try to turn on the vehicle, sparks can appear, potentially reacting with or igniting flammable substances. Always connect the second black cable to a grounded metal part instead.
This “bad is black” effect may have its roots in our deep-seated human tendency to associate darkness with wickedness. Across time and cultures, we tend to portray villains as more likely to be active during nighttime and to don black clothing. Similarly, our heroes are often associated with daytime and lighter colors.
US AC power circuit wiring color codes

The protective ground is green or green with yellow stripe. The neutral is white, the hot (live or active) single phase wires are black , and red in the case of a second active. Three-phase lines are red, black, and blue.

Trailer Plugs and Sockets

The yellow wire gives power to the left-hand brake light and the left-hand turn signal. There`s a green wire that controls the right-hand brake and light and the right-hand turn signal. The last wire of a standard four-wire system is white — it`s used as the ground wire.

If the ground is poor, lights may work intermittently or not at all. Even if the wiring to the plug is adequate, make sure that the ground connections to the trailer frame are good. They should be bright and clean, free from paint and rust, and secure.
When you look at a wiring diagram for your 7 pin plug, you will see trailer wire for things such as your trailer lights, your trailer brake, and back up lights. All these wires are great for functioning the necessary power to each light or brake controller.
Your 4-pin/5-wire wiring harness is what is called a “wishbone” type which simply means that there are two separate running light wires, one brown and one pink. This allows a separate running light wire for each side of the trailer which saves you having to run a jumper wire from one side of the trailer to the other.

Discover Relevant Questions and Answers for Your Specific Issue

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I just purchased this Yamaha boat w/Twin MR-1 140hp motors, less than 100hrs (60 prox)and the starboard motor only reached 8000rpm on a 10000 redline spec (the port motor reaches 10000rpm. I have replaced the spark plugs immediatly and now the motor reaches 9500rpm. When the plugs were replaced the plug wire top of the plugs had a black powder residue (like graphite)and #1 & 4 plug electrode end were black minimal soot and #2 & #3 had a white color residue on the ceramic.

Any suggestions to attain the full 10000rpm?

A Yamaha dealer is 100 miles, so I would like to fix myself if possible. Thanks

ANSWER : I never rec’d an answer…..I WANT A REFUND!

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Spark plug wire boot grounding out on coil, 96 outback 2.5 automatic, just put new spark plug wires, new spark plugs, and new coil on. ran great for two weeks, now spark is jumping out of boot at coil on one wire, put old coil back on and still does it in the same spot. replaced wires again, and still does it in the same spot. seems to do it only under a load. Is my new spark plug on that cylinder bad? Does the coil need some insulation under it? It is the coil that sits right on top of the motor. Any ideas? thanks.
ANSWER : Sparks are high voltage, and will always follow the path of least resistance. If you can visibly see a spark (whether in a lighted area, or in the dark), that means either that a plug wire (or coil wire) is open (non conductive), or your have a carbon track on the surface where the spark can be seen, but most likely you have BOTH problems!

If you have an ohmmeter, check the resistance of each wire involved, particularly spark plug wires … which means you must be able to connect to both ends of each wire at the same, and hopefully, FLEX those wires, to be sure they don’t have a break inside that is intermittent (comes and goes)!

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Trying to install a new fluro light, pull out old light to find 3 reds and 3 blacks 1 copper earth. What do I do to connect it up the right way??? When I pulled the old Fluro light out the 3 Reds were joined together with a connector ,two blacks were joined to one end of light wire, the other to the other end of the light wire,earth wire to the light case,the third black wire was connected to the wire from the ballast? Does this all make sense
ANSWER : No, this does not make sense but I have seen strange wiring before. There is power going from the light someplace else. Just connect it back up exactly as the old light was connected. It worked before so it will work again. If it works it is wired correctly. Without being there to check which wire was the hot wire and which was neutral it is impossible for me to say what is what. Make sure you connect the ground wire to the light chassis.

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I would like to hook up a 12 volt battery to the trailer. In the cupboard below the propane stove is a plug with white, black and orange wire to it.
In the AC power converter cupboard I have a plug with a black and orange wire. How do I hook up the battery so that it charges and runs the fridge while I’m driving, and lets me use the lights with the fridge on propane while I’m camping?
ANSWER : You haven’t told us what trailer you have, what DC-AC converter you have, it the wire is original or aftermarket and what gage it is.

Because of that you must first identify the wires. You will need a multimeter for that. Start by finding if your trailer has a negative wire or is using the chassis as the ground. For that disconnect the battery from the truck (make sure you have the radio code handy) then measure the resistance between the 3 wires and the body of the truck – you will find the ground wire when the resistance will be close to 0. Reconnect the battery and measure the voltage between the ground wire and the other 2 – the one with 12v on it is the power one and the other goes to the power input of the converter. Check that by removing the converter and looking where they are plugged – if you have any doubts that they are not the wires from the cupboard just check their continuity.All of this is a 5 minute job. Once you know the wires just connect the ground on to the minus and the power and the converter ones to the plus.

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What dose the black wire do from the trailer plug ?
ANSWER : Http://www.etrailer.com/question-5059.html

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I have imported a 2000 Compass Herald Clermont caravan from the UK to Australia. The van has two 7 pin round plugs to connect to the towing vehicle. The blach one which has 7 wires is self explanitory but never having owned a van in the UK with Batteries and charging unit I don’t know what the second plug which is on the grey cable does.
Could you please explain what each of the coloured wires (5 in all) connect to on the towing vehicle as I need to wire in a second socket on the rear of my car.
ANSWER : Here is a link to a site which explains all the different wire functions for all the plug types:

http://reviews.ebay.co.uk/How-to-wire-trailer-plug-and-socket-electrics_W0QQugidZ10000000004581261

Type 7 Pin Plug:(12S) (Grey)

Yellow – Reverse Light
Blue – Live Battery Feed
White – Earth
Green – Live Feed
Brown – Spare
Red – Fridge
Black – Second Earth

Hopefully this is what you were looking for.

Please click on the 4 Thumbs Up rating icon if this was at all helpful.

Thank you very much.

Joe.

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I have a Kohler Condidant 5 Generator that will run as long as you hold the start button in. It dies when you let off. I have a harness for the remote switch but no switch – It also will start the generator when you cross the red and black wire and run as long as you hold them together. There are 3 wires to the main switch and 5 to the remote switch. Does the starter stay engaged the whole time you hold the start switch or does the computer release the starter once it is running? The Generator is producing electricity because I tested it while holding the start button. Some where is a wire that shold tell it to keep running. I have read online many descriptions of the same problem, most are told the board is bad so they replace it and still have the problem. Have not found a solution. Talked to a marine machanic today and he said he fixed his friends generator doing the same thing by running a bypass wire but he couldnt remember exactly what he did it was a long time ago. Can anyone help me. Thank you
ANSWER : The problem is either the ballast resistor or the starter bypass relay. The bypass relay should be part of the starter solenoid. I’m afraid I can’t tell you exactly where the ballast resistor is located. It should be a physically fairly large resistor made of ceramic. It should be retangular roughly 1.5″-3″ long and 3/8″-1/2″ accross with a wire on each end. It could also be a coil of wire mounted on a phenolic board.
If you need more help just add a comment and I’ll respond as soon as I get the message.

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