I'm trying to install a stereo but don't have the plug I would like to know how what pins are 12v pos. and which is my ground. Can u help

This site may help you The Install Doctor The Do It Yourself Car Stereo Installation Resource...

Not sure if you mean the plug is cut on the car or the radio. The colour code is pretty uniform , so its easy with a meter to identify permanent 12V, switched 12V and ground. Whats left will generally be speakers and aerial power lead if you have a power aerial.

Coda has flat D 6 pin with center pin grd for 4 wire vs old arrow 6 pin round black one. Flat on bottom, count cw 12345 pins w pin 6 center... 2 pin minus 12 v, 4 pin +12v. For other 4 wire like speed/temp... 1 blue, 3(top) white, 5 pin bot right yellow, 6 center ground for spd/temp. White for speed wheel, rest not known. I used 2wire cable and 4wire cable with 2ft pigtails and 3amp fuse in red wire. I used old radio stereo 2 and 4 pin male female connectors at end of pigtails.

Black wire is ground, Red with 5a fuse is hot. Green/black is L Ground BTL, Grey /black is right ground BTL, the RCAs are left and right low level inputs. Then there is the 5 pin connector. It has a red wire for +12v, two black wires for input grounds, a green wire for left Hi input and a gray wire for right high input. If you install using traditional common ground high level, then you don't used the two BTL wires. Just connect the wires from your 5 pin connctor. If you use the low level RCAs for inputs, then you only need to connect the red and black from your 5 pin connector.(Plus the main red and black) Make sure the switched on the bottom of your EQ are set correctly. COM for common ground and LOW for RCA input or High for Green/Gray wire input. If you are using a floating ground the select BTL and connect the two BTL wires to the floating grounds of your stereo. There is also a line input adjuster so you can adjust your input sensitivity to match your reciever. I have the owners manual if you have any other questions.

OK, I assume you are talking about the harness of wires from the radio itself. If you are going to install this, I recommend you purchase an install wiring harness. This way you can plug into the factory harness of the vehicle. If you are attempting to hardwire the radio, please don't. If you vehicle doesn't have the factory vehicle side of the harness, try visiting the scosche or PAC website to see if they have it first. If you purchase a wiring harness, it will have all the information for the right install. Hope this helps.

check for a mute button on the delco

Two of the wires are ground (-) and two are hot/signal (+). You'll need a stereo 3.5mm mini plug (try your local RS...they also call them 1/8" plugs). The stereo plug will be divided into three separate connections called Tip, Ring and Sleeve. The Tip is right channel signal, the Ring is left channel signal and the two grounds should be connected to the Sleeve or ground connection.

If you get one side of your headphones backward (out of phase, plus and minus backwards) you'll know by the sound quality and so reverse the wires of only one side to correct.

1998 Chevrolet Malibu Car Stereo Wiring Diagram

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: Brown
Car Stereo Antenna Trigger Wire: Pink
Car Stereo Amp Trigger Wire: N/A
Car Stereo Amplifier Location: N/A
Car Audio Front Speakers Size: 4? x 6?
Car Audio Front Speakers Location: Doors
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: 6? x 9?
Car Audio Rear Speakers Location: Rear Deck
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

Hope this helps (remember to rate this).

check the ground to the amp. then check the remote wire. make sure u have the sub option on ur stereo turned on. if all is wired up correct an u do not have the subs turned on in ur stereo settings then the stereo will not send power through the remote wire an therfore your amp will not power on.

http://www.pioneerelectronics.com/pio/pe/images/portal/cit_11221/370967688DEHP2900MPInstallationManual1027.pdf
Look on page 2 for color coding.
http://www.pioneerelectronics.com/pio/pe/images/portal/cit_11221/370967683DEHP2900MPOperationManual1027.pdf
I don't see an actual pin out diagram. I believe that Walmart sells an adapter harness for Pioneer instalations.

Here are the wiring codes for the VT,
VN-VT Commodores:
Accessory (12V) Yellow
Battery (12V) Orange/White
Ground (earth) Black/White
Antenna power (12V) Yellow/Red
Front Left + Tan
Front Left - Grey
Front Right + Light Green
Front Right - Dark Green
Rear Left + Brown/Black
Rear Left - Yellow/Blue
Rear Right + Blue/Orange
Rear Right - Blue/Black

Antenna Up White (VR-VT)
Antenna Down Blue (VR-VT)
Phone Mute Yellow/Black (VT)
Dimmer In (12V) Brown/White
Dimmer Out (12V) Grey (VT)