QuestionHi Jerry, just been given a Autosound ce-3040mp3 Stereo, brand new, there is nothing in my car, just a pile of wires in the radio enclosure, cannot find a wiring diagram, for this year 89, that covers the harness, with radio, cannot aford to get it done, would love any help, thanks, you are a guru
AnswerSo I can presume that the factory harness has been cut, Keith.
You will need a few things:
A 12v Test light.
Popper battery (9v) and some speaker wire.
Installation Kit.
Details on how to use them are as follows.
Additionally, you will need a dozen or more 'Bellcaps' crimp connectors to attach wires properly [and a crimper tool to fasten them]. ANYthing else, is not what I would use.
INSTALLATION KIT:
Now, having a Jetta, you can find an installation kit at walmart for about 10$. This will let your deck fit the dash opening correctly. And generally, you should assemble this part 1st.
POWERING THE HEAD UNIT:
You will need a 12v test light (available at a parts store or radio shack, ect).
With that priceless tool, you should be able to determine 2 of the 3 main wires needed to power the head unit. Ground the clamp end of the test light to the cars' chassis and then probe wires with the other end.
1) MemoryWire
12v Constant (tested wire always has 12v no matter what position the key is in. This is the one you will use to provide station preset memory power to ther head unit (possibly a yellow deck wire).
2) PowerWire
12v Switched (That is, the tested wire only has 12v when the ignition is in the 'on' and 'acc' positions. This is the one that actually makes the deck power up. Possibly a red deck wire.
As to the ground:
You should simply run a short ground wire to the cars' chassis for circuit ground. Trying to find one in a factory harness is more trouble than it is worth for the novice (trust me). Likely a black deck wire [and it is usualy long enough to make it to the chassis].
Now you have dealt with power, memory and ground.
SPEAKER WIRE ID:
The easiest way will be to use a 9v battery to 'pop' the speakers (only
long enough to see whether they go IN or OUT of their frames) to see which
lead is positive.
Attach some wires to the battery of different lengths so it will not drain
when not in use.
Now.. get into a position where you (or an assistant) can see either the
back of [or the front of] the speaker being tested.
*Tap the extended battery leads to the speaker (for 1/4 sec or less) and watch the speaker.
During this test, a functioning speaker should move one way, then return to its idle position.
If the speaker cone jumped OUT of the frame (towards interior of vehicle)the POSITIVE lead on the battery is indeed hooked to the positive for the
speaker. Viola!
If the speaker moved IN towards the interior, the NEGATIVE battery wire is indeed hooked to the positive side of the speaker.
Simple, if you follow the instructions :)
Godd luck.
Jerry Mael
