I have a 92 civic hatch. The previous owner hacked the wiring harness for the stereo and hardwired everything. It was extremely ghetto so I am redoing it. Where do i connect the yellow constant wire? Is there a constant fuse in the fuse box where I can connect it? Secondly where do I connect the red switched power? What fuse does that go to? I tried searching and couldn't find anything so please don't tell me to search haha.
-Thanks HT.

 

http://www.installdr.com/Harnesses/HA-Wiring.asp

If you are installing an aftermarket "high power" HU, do not use the radio harness 12V constant, cap it off, [the fuse for it is a 7.5A "back up" fuse in the engine bay fuse box, replace it it blown it is needed for ECU/ECM memory].

For 12V constant run a fused 12ga lead from the batt, to the HUs yellow constant power lead.

Although you do want to connect the HUs ground to the radio harness ground, you should also run a 12ga ground lead from the chassis of the HU to the cars chassis, or you can use a metal back brace from the HU to the stock metal rear support. 94

 

Alright thanks! I ran a power wire from the battery with a 15 amp fuse. Then I ran another wire to the fuse box for the accesory wire. Its a 7.5 amp fuse. Dont remember what fuse # though. I used a connector that plugs into the fuse box and allows you to add a fuse. Thanks for the help

 

The stock radio harness has a 12V+ acc., yellow/red.

You should use it for the acc. power, it is only the 12V+ constant you need to run to the batt. as the stock radio harness 12V+ constant can not supply the current needed for aftermarket "high power" HUs.