Im looking to replace the tape player in my 2004 Td5 with a cheap Alpine CD/Wireless.

I see Mudstuff sell ISO adapters but do I need one?

The connector block that is part of the loom on my vehicle has round plugs but taped to the loom also is a rectangular connector roughly 10mm x 30mm with a cover on it. What is this?

Inside the dash I can see about 2 or 3 of these same rectangular connectors which I presume is part of a standard loom for vehicles that maybe have heated seats, a/c etc? But why is one taped to the current radio connector block loom?

Do I need the mudstuff ISO adapter or is the connector taped to my basic cassette stereo loom a standard fit for ISO CD players which would have been an option at the time my Td5 was new?

ps the pic is the connector that is attached to the back of the radio, not the other rectangular ones im on about.

I would imagine your mystery plug is one of the plugs for the switches that control non-fitted options as you say. Don't know why it would be taped to the radio loom, although it all comes from the same place in the harness.

You'll want an ISO adaptor for an after-market head unit yes. When I did my 200Tdi I ended up cutting the factory plug off and soldering on a pair of blank ISO connectors, as otherwise there wouldn't have been enough room back there with big old adaptor blocks etc.

I bought a simple converter, it's a BMW one, from Halfords.

My 55plate td5 is bog standard. How do I get a new age cd/mp3/ iPhone etc etc unit into it? How much work is involved? Is it going to cost me more than £100 on top of the unit it's self? Etc etc...

I've jut bought a Sony unit from Argos that does all the Bluetooth/iphone stuff. It's a standard single DIN size. All you'll need is the adapter for the loom - as above. Your local Halfords may even sell you a unit and fit it for you for not much £££.

Nice one cheers bud. I'll grab one similar. My other option was to just get a good(ish) speaker set, put it through the pillars and mount it to the deck head in the cab and go fre that!