How to attach 12V to car fuse box

Check the fuse box in the engine compartment and look for the interior illumination fuse. Before you replace it you will need to unplug the radio harness and check the new unit's memory lead, the switched 12 volt lead, and the Ground wire. Somewhere one or two of these have been either connected incorrectly or the wires were pinched when the dash was reassembled.


Also check the fuse in the new unit's harness and make sure it is ok. Here are the basic power wires in the Tacoma...yellow is 12v constant, red is accessory (turns on with key),and black is ground.
If there is a blue wire, it needs 12 volts when the car is running and the radio is turned on. Check your new unit's wiring diagram for the power antenna or amplifier turn-on lead and connect that to the blue wire.
Good luck

I have one of these new, in the box, with no instructions.

Specifications:
Power Output: 40W/Chan Maximum, 18W/Chan RMS
(20hz-20khz into 4 ohms at less than 1% THD)
Freq. Responce: 20hz-30khz, +/-3dB
Signal to noise ratio: 80dB, A-weighted
Input Sensitivity:
Low Level, 100-500 mV
High Level, 1-5v
Input Impedence:
Low Level, 10k ohms
High Level, 27 ohms
Load Impedence: 4-8 ohms allowable (4-8 ohm speakers)
Power Requirement: 14.4v DC (10.8-15.6 allowable)

As you can see the RMS wattage output of these units is only about 18W maximum.

I am planning on using the amp I have on a low power factory car radio. A low power factory radio output should be somewhere between 6-12 watts rms/channel. I will be using the "High Level" inputs for this. DO NOT connect a radio with a higher output power. If your radio says "High Power", 25W/channel, etc, do not connect to this amp. (exception: you can use the "line out" connectors, if so equipped, See Below). I don't have the connector for the high level input so i don't know what I'll do to hook up to it. I'll probably just run wires out of the amp, in lieu of the connector.

The "Low Level" inputs are for an unamplified, line level signal ("line out" connection of a radio, portable CD player, etc). Do Not connect a greatly amplified signal to these connections.

I don't know much about the "Input Sensitivity" control (pot). I'll be leaving it on "Low" for my initial test.

The grey wires are the right speaker wires and the white wires are the left speaker wires. The grey wire with a black tracer mark is the right speaker positive (+) wire. The white wire with a black tracer is the left speaker positive (+) wire.

The blue/white wire is for attachment to your radio's "Auto Ant" (power antenna) connection (usually a orange wire, I said USUALLY). If you have a power antenna on your car, simply splice into the wire running from your radio to the antenna. This blue/white wire activates a relay in the amp which, in turn, completes the circuit through the yellow (+) power wire (See Below). - Alternative 1: You could run this wire directly to your battery with a switch to turn the amp on. You would need to place an in-line fuse of 2amp. - Alternative 2: You could connect this wire to the accessory fuse in your fuse box. If this is done, again, attach a 2amp in-line fuse for extra protection. (Note: if attached to your fuse box accessory fuse, the amp will be on even if you're not using the radio. You could have a switch here also). These are just suggestions. The most common way to connect the blue/white wire is the "Auto Antenna" wire of your radio.

The large black wire is main Ground (-) for the amp. The large yellow wire is Positive (+) power to the amp. Ideally, these should be connected straight to your battery's (+) and (-) terminals. The yellow wire on your amp should have an integral in-line fuse holder with a 7amp fuse. If not, add one. Of course, the black ground wire could simply be attached under a screw, into the body of the vehicle.

Hope this helps !

Hi. The red wire is your real positive wire and goes to your fuse box on a fuse with 12V only when ignition is turned on.

The orange one needs to get steady 12V. Plug it on an always alive 12V fuse.

The black wire is the ground. Put it on a screw attached to the frame, you can find one inside your fuse box.

If your are not familiar with all of these just twist your red and orange wires together (positive) and plug it to your battery positive + pole. Put the black one on the negative pole - of your battery. This is the easiest way to go if you have enough wire length.

Hope it helps!

blk-ground
yel-constant 12v
red-switched 12v
blu-power antenna
blu/wht-amp turn on
orn-illumination
Speakers- black stripes are negative.
whites-front left
greys-front rights
greens-rear left
violets-rear rights
tape off any unused wires, do not let them touch ground or any other wire.

Do you want to install a new unit or wht ? u may use this reference to work upon ....
Get yourself a digital multimeter. Find the +12V constant, 12V remote, and ground. Connect them to the new head unit. For speaker wire get yourself a 9V toy battery and listen to poping noise. If you have a factory amp you need to power up the factory amp. Use the wiring diagram below to serve as a guide. Test your wire first before connecting them.


NISSAN
P o w e r
Memory (+12v Constant) Red
Ignition (+12v Switched) (varies) Brown or Green
Ground (-) Black (varies - most don't have one)
Illumination Red/White
Dimmer Red/Black
Power Antenna Green
S p e a k e r s
Right Front (+) Brown
Right Front (-) Brown/White
Left Front (+) Black
Left Front (-) Black/White
Right Rear (+) Blue
Right Rear (-) Pink
Left Rear (+) Red
Left Rear (-) Green

Yes, the black wire goes to ground.

Yellow - Constant 12v.

Black - Ground (MUST hook up! NEVER let your antenna pull the ground)

Red - Switched 12v through the ignition

make sure the yellow wire is hooked up and is getting 12v and the red wire is getting power to if this is all right unhook the red wire and add some speaker wire to it and hook it up to the fuse box and also make sure you have it grounded and the antenna cord is plugged in

make sure u have connected the fm tunner silver box if not thats your problem if u do not connect it it wont power thats really important.

if they gave you the right one, then you should have two seperate plugs from the original radio. you may have to follow the wires down several inches to find the other plug connection. good luck.

Hi,

The wires you posted need not go anywhere not unless you have a device that will attached to them.
antenna power - connects to the motor of a telescopic external car antenna. When you power on the unit, it will automatically raise the antenna;
amp power - connects to an add-on/external amplifier. This switches/triggers the amp to gon when the Jensen is powered up;
reverse - attaches to the reverse light of your vehicle. This will tell your unit that you are reversing and will activate a rear view camera.

As earlier stated, if you do not have any use of these devices then there is no need to connect the above described wires to anything. Connecting them to the ground would have a bad effect on the internal circuitry of the Jensen since they are meant to supply power and therefore are connected to the B+supply when the Jensen is powered except for the reverse which would sense a 12V from the vehicle's transmission. Connecting them to the constant B+12 would have no ill effect except that your Jensen would always be on.

Hope that this be of some help/idea. Pls post back how things turned out or should you need additional information.

good luck and kind regards.