try this site http://www.modifiedlife.com/1987-honda-prelude-car-audio-wiring-diagram/
if factory wal mart sells wire harness and it does some after market serios
try the12volt.com i know for a fact thay have one Try http://www.ahdol.com/ for the diagram.
When changing spark plugs for the first time, a diagram comes in handy. A spark plug wiring diagram for a 1999 Honda Prelude can be found in its maintenance manual.
Try modifiedlife.com You can find the diagram for any year Honda there.
The speakers are powered by the stereo, which in turn the stereo has a fuse. If the stereo works (turns on), but not the speakers, then it may be a wiring issue.
The wiring harness from the 1999 stereo has a 21 prong plug and the 1995 has a 14 prong plug you can purshase a harness from Honda but it has to be hadrwired to the exsisting wiring but don't screw it up, go to Honda and get a wiring diagram for the both of them to match up the wiring you need to make it work.
Go here www.the12volt.com they have your diagram for free.
i need wiring diagram for a Honda 300ex
The easiest answer to this question is "www.installdr.com", there is a complete .pdf including diagrams on how to install the stereo for a 1992 prelude.
A wiring diagram, for your 1999 Honda Civic, can be obtained from most Honda dealerships. The wiring diagram can be found at most auto-parts stores.
You can find the Diagrams in a Helms or Chilton manual. Alternatively they are available online. See the Related Links.