I have decided to make a start on wiring up my radio, I don't want to cut into the original wiring.
I thought a good place to get a Constant (+) and a second (+) that is only on when the car is switched on would be straight from my ignition switch.
 
As far as I understand the ignition switch has 3 wires.

1. Constant (+) in
   
2. (+) out when ignition is on
   
3. Starter
   

So I have made a harness to rob power for my radio from here.

 
It just splits 1 wire into 2 from the constant (+) for the yellow memory wire to my radio.
and splits 1 wire into 2 from the ignition when in the on position, to run the red (+) wire on my radio.
The starter just joins the to ignition as it would if no harness was in place.
 
Before I plug this in I thought I would ask if it is a good idea? am I missing anything?
The radio wiring has a fuse on the yellow memory wire, should I include another fuse on the red (+) wire?
 
---------------------------------------------------------------Edit------------------------------------------------------------------
 
Im a dick, I should just use a multimeter and find the standard radio wiring, I'll leave my original question up anyway.

you can use the original switch wire to power up the new unit, But I'd run a new power cable to run the new stereo from the battery with a fuse in it..

Well after removing several spliced/monkeyed wires that had been added over the years, my 1000 original wiring now matches the wiring diagram.
 
 

 
After using my multimeter and the original wiring diagram, I have found that standard the 1000 has a constant (+) only.
A Blue wire with a sleeve over it.
And strangley enough has wiring for the coupe clock, hmmm?
So im back to my original idea of the harness in my first post as I like the idea of my radio switching off with the car.
I might even run my Cigarette lighter on this circuit as well so if I use a GPS it will switch off with the car.
 
Im using a "Retro-Sound, Model-One-Radio"
The fuse on the memory wire for my radio is 15A, so i feel better about using my harness instead.
 
I might still use a better joiner instead of the block joiner, but it will do for now.
(Maybe I should wrap some electrical tape over the screws on my block joiner for now)
 
Im just using a pair of 4 inch speakers (Fusion CS-FR4020, 30 Watts Rated Power. 160 Watts Peak Power) that I will hide under the dash where ever they can squeeze out of sight, So no amp for now.
 
They claim 83dB, I'll see how they sound in the 1000 and decide from there if they are adequate.
The area inside a 1000 is a small space so these speakers might be enough for me.

If you cut a new parcel shelf for the rear using 12mm + plywood you can get a pretty good soundboard for your speakers. I folded some perforated steel over the entire shelf so as the speakers were hardly visible but still audible. I hate seeing shiney speakers floating on the parcel shelf of old cars. Not cool.
 
That radio you got is very nice, great purchase.

only way i've never cut out holes is to use speaker pods, i'd assume you'd be able to knock up some pretty good custom pods and wrap them in some similar vinyl and bobs your uncle
 
i reckon just two speakers up front would do, im not 'into' doof doof i'd rather save weight and go faster

oh i see can you bolt it? that way you could drill the hole and paint the edge, or maybe just weld a bolt to the inside of the wheel arch where you need it then spot it up with some paint?? im not a real fan of sikaflex

I have taken on some of what you guys have said as well as incorporated some of my own ideas,
 
I have...

• Made a new ignition harness without the "Chocolate Block Joiner"
  
• Run a seperate (+) wire with a fuse from the battery to a relay that will only allow power to the Radio and Cigarette lighter when the ignition is in the "On position".
  
• Ran a seperate Fuse for the Cigarette lighter
  

 
I have made the Cigarette Lighter part of my harness removable also.

Now that is a Good Harness Bro.. well done..

Just looking at your photos beetwenty.
 
Nice work on the install of the new radio/stereo system. It looks the part and not oo out of place in the dash. The wiring harness also looks pretty schmick. Well done.
 
I was also impresed to see that you had earmuffs and glasses on, but the lack of a guard on the grinder concerns me somewhat... I dont want to sound to mean, but geez dude for the love of 5 finger goodness, get a guard on the grinder!