Stan
Ok you hit the nail on the head... Volt meter was needed and used....so first off. I had company drop by..( brother and his wife ) I welded up a steering shaft for him used on his riding lawn mower... lol
SO.....I want to be clear .... there is NO ACC wire... lol
The ignition will not go to acc... believe that....
This is a commercial vehicle. And i think that in its self has something to do with it...
I believe the orange is illumination. Low voltage 3.6 volts that fluxuates to 6 volts
Yellow wire consistant 12 volts
NO acc wire. PROMISE... lol
My color wires do not match the plug adapter I bought that says its for my van. Hell there is an empty din were my Acc wire should be according to the adapter harness.
I figured out the 8 wires and match the wire adapter.
Grey green white purple.
Let me tell you those colors are NOT what i have in my van.. lol
Never the less i have all speakers working well i didnt plug in the ceiling pod speakers.... based on what you told me.
I will take more pics tomorrow evening
I fly Rc airplanes.... I soldier alot.. and I plan on doing that to all my wire connections....

That doesn't make sense. I believe you, but it doesn't fit. And while there are differences between cargo and passenger vehicles, in this case it should be no different. The radio needs to know when to shut itself off. It should even have the delay power(the one that keeps the radio on on after the key is turned off, but only for - minutes, or when any door opens). My '00 Astro Cargo had this. Are you sure that the old radio didn't pop the fuse?

Stan
Ok looking at the picture with the wires...
opposite from the black wire which was tested for a known
good ground .. and it is...
is an Orange wire. that has no power you might be
correct about a fuse... only way of knowing that would be to
test all fuses.. funny thing about the express and savana
the fuse box I think is out under the hood.
So like I mentioned I did not have time last night
company came over... so I will have a list of things to think
about while I am at work.. lol and then if possibly when I get
home tonight I will empliment my plan and try to find out what
that lonely 1 orange wire goes to ... that still does not solve
my issue I need 2 wires... and by me testing the one and it having
low voltage I can only assume its the illumination wire...
It would be nice to find out the other wire was ACC
but I have NEVER been in a vehicle were you couldnt move the keys
to ACC.... this ignition Will not go in that direction.. ( got me scratchin my head )
OH... the radio worked before me pulling it out.
and how easy it is to plug back in I am thinking about doing that
and turning on my head lights and testing to see if the illumination
brightens and or dimmes .... see like you said if the radio stays on for a
small periode of time like my GMC Sierra Truck does.
this vehicle is new to me so I dont know all the things that it does..
or should do .. ( little Kentucky talking there )... lol

I don't know how similar the '06 and '16 are, but mine has another fuse box under the drivers seat. And as far as the acc position goes, my key doesn't turn back either. The acc position is the first click forward, ign is the second click. My '00 Astro was this way as well.

The key going forward.... is technically not acc.
If it were the ignition lights on the dash would not be on
If your light on the dash comes on then your ignition is hott and you can potensionaly burn up your coils ACC
Does not allow the ignition to the motor to be hott.
My GMC. Ignition is different i can turn my ignition backwards and my ignition to the motor is Not Hott. Which i can leave that way all day long and not risk any harm to my motors ignition system... ( coils )

That wont work for me ... when I go and fly my Planes
I spend alot a time with my stereo playing in the back ground i sure dont want my ignition Hott ( turned on )
For any length of time other than starting the van..
NOW.. unless you know something that I dont ...
But as long as that light is on your dash your ignition coils are energyzed...

I better not post any more on this ignition issue... i need to be in frt of it.... i shoudnt say till i know for sure... but i dont recall it clicking 1 time forward and no lights on the dash coming on... So i apologize.... i better not post until i am in frt of it and trying again... lol. We tend to do things in a hurry and not think... lol

Ok.. so I called the wife... asked her to jump in the van... asked her put the keys in the ignition... and turn it only 1 time... her responce. It wont turn 1 click it wants to go over to were the lights come on.... then she says wait i can pull it backwards 1 click and all lights go off except the battery red battery light... I thought Bingo... there is the Acc... lol. So while she is still in the van and now just in acc mode..
I asked her to take the test light sitting there and go to the orange wire. Seei f the test lights up. It didnt... had her to back probe the red wire to make sure the test light wa s connected. It was... lol. So still NO acc wire.. lol.

Hopefully these might help, not sure if it will open though.

| Repair Guides | Cellular, Entertainment, And Navigation (2007) | Radio/navigation System Schematics | AutoZone.com

Stereo Installed
 

I have the stereo in the dash All wired up....
Sirius Activated ... sounds great with the added speakers
NEW in front 6.5 round in the doors
and 6x9's in the rear doors pointing inward towards the front seats.
SOUNDS GREAT.... the Kenwood has the old style Equalizer in the
radio so you can tune it the way you want it like I didn many years
ago ... with that single eq unit... lol
Made another trip the junk yard today and found my needle in the
hay stack.. lol
The GMC emblem thats needed for my new grill on the way...
got a call that my MUD flaps came in today... so I will pick them up
tomorrow....
I may put a small amp in maybe drive 2 small woofers for some
Thump.. ( GOOD BASS )... not teeth rattlen ..