OK..I'm finally getting around to installing a head unit(Pioneer) in my 85 SR5 4x4 & guess what..(previous)owner has cut the plug off the harness. With wiring being my achilles heel I figured I'd post up & see if you guys can help out(&I'd rather not pay a stereo shop). Here's what I could determine(voltage wise) from the wires under there... in the Off-ACC-Run positions.

Red/Grn stripe..0.6v-12v-11.5v
Wht/Blk stripe..0-0-0
Blk/Wht stripe..0.1-0.1-0.1
Lt Grn/Blk stripe..0.2-0-0
Lt Grn/No stripe.. 0-0-0
Lt Grn/Rd stripe.. 0-0-0
Lt Grn/Yellow stripe.. 0-0-0
Dk Grn/No stripe..0-0-0.1

Soo..it appears the Red/Grn wire is POWER..(should it have 0.6v-OFF)? What should I use for a "signal" wire(to not lose presets every time the key is turned off? Maybe the Blk/Wht..since it shows 0.1v all the time? Which is Ground?Sorry..but it's been a LONG time since I've wired a stereo.Sleepr71.

 

hope this helps

 

do your wire match these ones??



i can tell you for sure that

Red/Grn stripe..0.6v-12v-11.5v this is you wire that gets hooked up to red
Wht/Blk stripe..0-0-0 this is ground, black on your head unit
Lt Grn/Blk stripe..0.2-0-0 front speaker ground
Lt Grn/No stripe.. 0-0-0 front speaker power

also, you are missing your constant 12volt power (yellow on your head unit)

the orange wire is for illumination (headlights) your wire might be a diff color... mine is an 87.

 

My '85 stereo wiring was pretty hacked up, I tried using it for a new radio but found it caused all sorts of issues with dash lights, parking lights, etc. that I abandoned it and rewired it all with new power and ground wires. Re-used the factory speaker wires that are easy to trace out.

 

I can take a picture of the back of my stock radio, and it has the wiring pinout on it.
If you want