Hi,

I'm currently in the process of wiring in my new head unit, and I was following the guide here:
https://www.fiatforum.com/grande-pu...ket-hu-grande-punto-also-most-other-cars.html

However my black connector doesn't seem to have a plain red wire coming from it, so I am unsure which is the live. Here are 2 pictures of the wires I have coming from the black plug, so could someone please tell me which one I should be splicing into?

I swear I added an extra wire from the cig lighter to any other connector.

PuntoBooth said:

I swear I added an extra wire from the cig lighter to any other connector.

Click to expand...

Yeah I know I need to add an extra wire from the cig lighter, but what do I connect it to when I get it back up to the headunit?

the switched live pin on the ISO adaptor


(pin5) also known as ignition


http://www.davidsonelectronics.co.uk/pinouts.htm

Thanks so much andy, should there definitely be a wire going in to the ignition one? (I'm guessing since the standard HU should get it's power from somewhere)

I don't want to have to be soldering wires to pins

DlightSwitch said:

Thanks so much andy, should there definitely be a wire going in to the ignition one? (I'm guessing since the standard HU should get it's power from somewhere)

I don't want to have to be soldering wires to pins

Click to expand...

The OEM headunit has a constant live feed which the new headunit will use.... it is turned on by a signal via the CAN network, After market units cant detect this and go via an ignition feed which switches the radio on and off with the ignition ....


http://www.passionauto.co.uk/produc...iat-grande-punto-iso-stereo-adaptor-lead.html


with that you should be able to wire it in no problem without having to attack the standard loom / plug making refitting the original unit when you sell much easier

So with that I plug the existing connector into the big black bit, and the other 2 plugs coming off it just plug into the back of the new headunit?

So I'm guessing I use a scotch lock on the wire of this new lead, so the original wiring loom remains untouched?

Sorry for asking silly questions but I'm new to this

yes

but looking at that there is a length of wire to attach to it ready...

you can cut into the correct wire on the adaptor and use a small screw terminal or a through crimp



and a scotch hook onto the fag lighter red wire (i'd add a small fuse in there too as you really do not need 20a running up the back of the dash to the headunit (lots of sharp bits up there)

loads to chose from i usually use these as they are stocked locally



so in short

scotch hook a short length of wire onto the red fag lighter wire.....

put a blue insulated crimp onto the end of it



attach the fuse holder (i'd use something like a 2amp or 3amp fuse)

crimp another Crimp to the length of wire and feed it up past the gear stick and up the back of the headunit and cable tie it in place best you can to keep it away from any sharp bits

and cut into it into the red wire on the ISO adaptor and connect your cable that you have fetched up to it where it goes into the head unit

just like that

I put 10a wire it doesn't need to be that heavy but it ensures good contact with the scotch hook and crimps

get the fuse as close to the scotch hook as you can and wrap in tape to hold the crimps in place and the fuse

Thanks again Andy that's really helpful.

I'll order that adaptor when I get back off holiday, and follow your little guide there! Cheers

No problem


when your wiring that in keep the ignition off that way you cant short out the fag lighter

Just watch your hands fiat do not seem to care about sharp bits behind the dash

i'd link to the adaptor with one of these



id order a pair of these unless you know someone who has a set makes crimping very fast easy and secure

http://www.google.co.uk/products/ca...=X&ei=YqPmToWnMoWD8gP9263oCQ&ved=0CJsBEPICMAQ


shop about price wise

As to keeping the ignition off yeah I will, I was planning on disconnecting the battery anyway.

Trust me, I've learnt about sharp bits behind the dash before as well I find myself feeling more and more sorry for Fiat technicians every time I do something to my car and realise how complicated/dangerous it is!

I think I may have a set of those crimping plier things, or a set I can borrow of my dad.

Crimps, Crimp Butt Connectors, so much to learn! I only found out what a scotch lock was a few days ago

If your planning on getting the steering wheel adaptor like the connects2 one you don't have to mess about with the wiring david.

And what headunit you planning to install?

JackFi said:

If your planning on getting the steering wheel adaptor like the connects2 one you don't have to mess about with the wiring david.

Click to expand...

Why? What's different?

And the headunit I've got is this one:

http://caraudiosecurity.com/shop/product/products_id/13940.html

The difference is you can use the steering wheel controls and you won't have to mess around with the wiring lol

So if I get the steering wheel adaptor I don't have to wire it to the cig lighter??

That is correct sir.

JackFi said:

That is correct sir.

Click to expand...

Really?!

Indeed Mr. Booth the connects2 one does. I used to have it wired to the ciggy lighter before I bought it then it said in the instructions to make sure the wiring hasn't been changed.