QuestionI am putting a JVC cd player in jeep. I hook all wires up and I get power, etc. But when i hook the speaker wires up, nothing. I took out an alpine cd player (played fine but cd player damaged)...when hooked up speakers work. I can hook it back up, speakers work. Unhook and hook the JVC up and not sound. where could the problem be?
AnswerI can only think of two senarios that would do that as the radios are very simular in their spec.
One, you have an amp and there is no output on the blue wire to it, this is live only when the radio is ON.
Two, the speakers wiring on one is three wire (common earth) and the other is four wire, (individual + &- needed for all speakers with active earth).
I attach my standard text for testing the car's harnes which if followed should resolve the matter.
You will need a test meter set to 20vdc or a 12v lamp or test probe pe, AA batttery (nicked from TV remote for an hour) and some paper and a pen for notes.
I run this test when working on a car where a previous owner has ripped the connectors out of a used car and the new owner is in the same boat as you so it cover all the basics and should sort you out. So armed with your 12v probe or test meter, some paper, masking tape and a felt tip pen, here ya go!
Speaker wires. (non-amplified) these are tested with a AA battery across a pair of wires and you will here a 'pop' from the speaker,
These are normally twisted together in pairs (if you are lucky) and usually in a loom of their own before going of to the four corners of the car and are the same colour for each pair but one with a colour trace on, i.e. blue and blue/white, green and green/white.
Label it (e.g. left rear), continue until all four pairs are identified and labelled.
Earth one side of your meter or tester to a metal part of the car, probe each wire until you have a wire that is live all the time with the ignition OFF, label this ‘+30’.
Switch on ignition and redo test until you find another previously dead wire now live, this is ‘+15’.
Switch off ignition and switch on the side / park lights, repeat test until you find a third live, label this ‘lights’. Switch off the lights
You should now have two or three left. One will be earth, (usually black or brown); one could be to an amp and or electric ariel (usually blue or blue white) and one for phone mute if fitted. Clip tester to +30 and probe one of the remaining wires, if you have an electric ariel it will go up. Connect your DIN plug to the correct wires and jobs a good un’.
DIN connections are.
Speakers
Right rear -, right front -, left front -, left rear-,
Right rear +, Right front +, left front +, left rear +
Power block viewed from cable side
Phone mute (white),/ n/c, / ariel & amp (blue), /ignition (red)
N/c, / 12vlive, (yellow or orange), / lights, (various colours),/ negative (black)
