I'm trying to hook up a Brinks 7141 motion detection light with EZ connect plug whitch has therr wires coming out of it one white one black and one green with yellow stripe and my box on the back

Please perform these connections with the mains power off.

The standard is the Black wire is hot, the White wire is neutral, and the Red wire is switched. For your Sensor connection 120V is connected Black to Black and white to white while the Load is connected White to White and Black to Red (assuming your load is using standard color coding.
Here is a simple diagram for your connection.

Black from power supply goes to black from sensor. Red from sensor goes to both blacks from lights, all remaining whites go together.

You are replacing porch light with light fixture with motion sensor device.
Each light has 1 black and 1 white wire.
The motion sensor has 1 black 1 red 1 white:
Copy following link for motions sensor wiring illustration:
http://waterheatertimer.org/How-to-wire-switches.html#motion

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problem could be sensor, not light, black is power, white is neutral, green is ground, sensor may have a red wire, black wire and a white wire, hook black wire to power from sensor, red to black wire on light,
white wires will connect together, then wire black to power on home, white to white on home and green to ground, if you need help call an electrician and they will wire it for you

look to see how you have it wired, most sensor lights have many wires to put together, if it is not wired already from factory, you need to look to see how you have it wired, most sensors have three wires one black one red and one white, black wire goes to power, red wire goes to lamp, white goes to neutral, after all is wired you should have only 3 wires a black a white and a green, black to power white to home neutral and green to ground

Go to napa and they have the connectors that plug in to your existing wire connection, I don't know if they have the one for yours, but it won't hurt to check, you don't have to cut or splice the wireing with there trailer connectors, plug it in and done.

The red wire from motion detector connects to both of the black wires from the lights. The black wire from the motion detector connects to the incoming black wire from the switch or source. The white wire from the motion detector connects to both of the white wires from the lights and to the incoming white wire from the switch or source (all white wires are under one wirenut).

The motion light comes from the store with a neutral (white) hot (black) wires. If there are multiple light bulb sockets on the motion light, the black wires will be connected together and the white wires will be connected together. There will be a motion sensor that has a red, white and black wire. The red wire is connected to the black wires from the bulb sockets. The remaining white and black wire from the sensor switch are connected to the line power from the panel. you must remember that all white wires from the entire project are to be connected together.

Most motion lights feed the line power from an independent switch that connects the power to the motion light fixture. Remember never to connect the white conductors to any red or black wires, as this will create a ground and you will continue to trip your circuit.

I hope this has been helpful.

Motion sensor will not be powered from 120vac directly. They usually run on 6-12vdc.

Black is neg, Red is pos, and White is neutral or ground.