Cut wire how toRewire my weatherproof sercurty camera

The easy way to find out what was the positive or the negative without knowing the wire color code or without using the tester,,,is.. cut the bulb's line you want to know. Scratch them one by one to the unpainted vehicle's body,,If the wire has built a spark?.. That is the POSITIVE.

normally there is only one earth wire on a battery as all units earth through this wire to the negative terminal. I would not bother trying to reconnect the cut wires as this will lead to problems further on. Go to a wrecker that handles you model vehicle and get the positive terminal wiring loom and replace all the cut wires . Leave the negative terminal off while you are doing this.

2000 Chevrolet Impala Car Stereo Radio Wiring Diagram
Car Radio Constant 12v+ Wire: Orange
Car Radio Switched 12v+ Wire: Yellow
Car Radio Ground Wire: Black
Car Radio Illumination Wire: Gray
Car Stereo Antenna Trigger: White
Left Front Speaker Positive Wire (+): Tan
Left Front Speaker Negative Wire (-): Gray
Right Front Speaker Positive Wire (+): Light Green
Right Front Speaker Negative Wire (-): Dark Green
Left Rear Speaker Positive Wire (+): Brown
Left Rear Speaker Negative Wire (-): Yellow
Right Rear Speaker Positive Wire (+): Dark Blue
Right Rear Speaker Negative Wire (-): Light Blue

My suggestion ask that mechanic to do it for you on the side maybe and see how much he would charge if you don't know anything much about going under the hood that would be best, if not here goes. First find the horn make sure you can get to it there should be a connector or plug on it should being the key word. Find it and remove it, you will need a wire long enough to run from the horn around and through some place in the firewall next to the wall between the engine and inside and back out to the battery so make sure its long enough to do that as well make sure the wire is 2 different colors inside sometimes they come copper on one side and silver color on the other or you can find black and red coated wires an 18 gauge speaker wire should work 15 to 20 ft should be plenty tape the ends of the wires with 8 inches excess hanging to the battery one end and the other to the horn not connected just so it holds the wire while you run it to inside the car string the wire around under the hood so its not all over the engine but around it and not on anything that gets hot to melt it. Make sure you know when you run it inside which side of the bend (you will have to bend it to get it inside the cab) make sure you know which side was going to the battery and which to the horn when you have the wire inside the car cut the wire on the copper side or the red side but dont cut the black shave back the plastic on the cut wire so you can get to the bare wire on the toggle switch any kind with 2 connectors on it is ok or you can also get a push button kind so it works like the horn find the positive connector on it and negative connector, connect the side of the red/copper wire that is going to the battery to the positive side if it has no positive or neg it doesn't matter either side then. Now connect the other side of the spliced wire to the negative or other side of the switch. once this is done under the hood look for positive and negative on the horn strip wire ends so you can get to bare wire connect the red/copper to the pos. and black/silver to the neg. You can use connectors for this or you can twist the wires around the connectors like a twist tie and tape with black electrical tape not clear tape. then on the battery put the red to pos. and black to neg. I would splice off enough plastic coating to wrap wire around battery terminal connector not the post make sure you connect the pos. last and don't touch the neg wire to anything else. then test the horn if it is working unhook the pos. side of the wire on the battery until you get ready for inspection and when done remove this so you don't have battery drain or other problems. Good luck

Car Radio Battery Constant 12v+ Wire: Orange
Car Radio Accessory Switched 12v+ Wire: Yellow
Car Radio Ground Wire: Black
Car Radio Illumination Wire: Gray
Car Stereo Dimmer Wire: N/A
Car Stereo Antenna Trigger Wire: N/A
Car Stereo Amp Trigger Wire: N/A
Car Stereo Amplifier Location: N/A
Car Audio Front Speakers Size: N/A
Car Audio Front Speakers Location: N/A
Left Front Speaker Positive Wire (+): Tan
Left Front Speaker Negative Wire (-): Gray
Right Front Speaker Positive Wire (+): Light Green
Right Front Speaker Negative Wire (-): Dark Green
Car Audio Rear Speakers Size: N/A
Car Audio Rear Speakers Location: N/A
Left Rear Speaker Positive Wire (+): Brown
Left Rear Speaker Negative Wire (-): Yellow
Right Rear Speaker Positive Wire (+): Dark Blue
Right Rear Speaker Negative Wire (-): Light Blue

http://www.the12volt.com/installbay/stereodetail/347.html

Should be it.

Black/white to positive and white to negative. Coil will show which is pos + and neg -

fun fun fun.
1990 Toyota 4Runner Car Stereo Wiring Schematic
Car Radio Battery Constant 12v+ Wire: Blue/Yellow or Blue/Black
Car Radio Accessory Switched 12v+ Wire: Gray
Car Radio Ground Wire: Brown
Car Radio Illumination Wire: Green
Car Stereo Dimmer Wire: N/A
Car Stereo Antenna Trigger Wire: N/A
Car Stereo Amp Trigger Wire: N/A
Car Stereo Amplifier Location: N/A
Car Audio Front Speakers Size: 4′
Car Audio Front Speakers Location: Dash
Left Front Speaker Positive Wire (+): Pink
Left Front Speaker Negative Wire (-): Purple
Right Front Speaker Positive Wire (+): Light Green
Right Front Speaker Negative Wire (-): Blue
Car Audio Rear Speakers Size: 5 1/4′
Car Audio Rear Speakers Location: Side Panels
Left Rear Speaker Positive Wire (+): Black
Left Rear Speaker Negative Wire (-): Yellow
Right Rear Speaker Positive Wire (+): Red
Right Rear Speaker Negative Wire (-): White