battery lead is straight from the battery to keep the radios memory, acc or switched power is the signal the radio gets to turn on and I think it actually feeds most of the power. when you turn off the car just go 1 single click back then turn it forward 1 click, this should turn off the engine and leave the stereo on. the radio shouldnt run in any other position. if it runs in those positions and keeps memory then its hooked up right (2 of the wires anyway)
first thing is to get a light tester if you dont have one already, that will allow you to find the right wires if you get lost somewhere. they are about $5, any parts store or walmart.
the 3 wires you must have are power, ground, and acc (switched power). all 3 should be on the origional harness if you can get to it. dont cut the harness if its there, either crimp on a connector that will fit in the slot, or use the side crimping splicers.
hook up your test light to a piece of metal in the dash. they arent all good grounds but try a couple and you will find one that traces metal all the way to the body.
1 - find your battery hot wire. with the key off and out of the ignition, probe the ends of the wire harness with your light tester until it lights up. if you dont find one check your tester ground on the cig lighter or ash tray light. if your grounds good and you still cant find one, run a new wire directly from the battery with a small inline fuse. since it sounds like you already have it hooked up, if your radio presets and clock dont reset after turning it off, then this wire is right. if they go away then its not hooked up right.
2 - find your accessory wire. this wire will be tested just like the hot wire, but it will only work with the key in the ignition and in the on position (last click before you twist to start. if you cant find this you need to patch into another wire that is on that circuit. blower switch, sometimes cigarette lighter, etc. if this is hooked up correctly then with the key in the full on position (or the car running) the radio will be on, and when you turn it off it will shut off. often the hot and acc wires get backwards and it will run at odd times like when the car is off.
3 - once you have the hot wire ran or found, hook the clamp of the light tester to it and check for ground. if any light up they are a ground. be carefull since you can get light from speaker grounds in these cars as well. if you cant figure out what is what, then test the nearby bolts and find one with a good connection and just run the stereo wire to it.
Illumination is the dimmer switch, there will probably be an amp control wire, and other ones. just focus on the above three for this install.
for speakers, search out common ground on the site to find the proper speaker wire connector in the front kick panel. you will want to sever the ground connection and run a new ground connection to it from the back of the stereo. then hook up the rear speakers to the normal speaker wires under the dash. my preference is to cut a plug out of a junk yard car and just run new wires to the front using the plug so you dont have to cut stock wires out.
Edited by djellum, 16 July 2013 - 02:03 PM.