I have low volume issue on my upgrade and want to fit an amplifier has anyone got a wiring diagram of where it goes in the system for best effect. Colour codes of wires involved would be good.

I also would be interested in info.for this

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Lukie wrote:

I also would be interested in info.for this

Chinese amp installed and works a treat sound now better than my parrot on the wife's jeep.
It was two channel so just connected one channel up and perfect bolted it under nav unit where the voice control used to be.

Could you let me know the parts you used, and the wiring diagram for it please could help alot of people on here

Interesting. I have no shortage of volume on my conversion. Ron B. VK2OTC
2004 L322 V8 Auto
2007 Yamaha XJR1300
Previous: 1983, 1986 RRC; 1995, 1996 P38A; 1995 Disco1; 1984 V8 County 110; Series IIA

Ron ULF low volume I believe comes with the mk4 dvd satnav upgrade

Hi Luke, mine has the Mk 4 upgrade. Odd. Ron B. VK2OTC
2004 L322 V8 Auto
2007 Yamaha XJR1300
Previous: 1983, 1986 RRC; 1995, 1996 P38A; 1995 Disco1; 1984 V8 County 110; Series IIA

I have the mk4 upgrade as well

Can you share your findings with us so we can try and get sensible volumes on on bt

Here you go guys here is how I solved mine been working a couple of weeks now with no problems.

The amp I found on eBay for 9 quid from jersey even cheaper from China just search 12v car amplifier.

The wiring is as follows cut the speaker wires by the ulf plug. Blue and black is speaker positive blue and brown negative.
Solder a length of wire with audio plug to the wires coming from the plug (audio leads come with the amp so I just cut a length off of one of them).
Connect a length of speaker wire to the remaining speaker wires leading to the car speakers. The amp has a jack plug input but a spring connector out put.
For a power supply I picked up the supply to the old voice unit at the jumper plug red and yellow positive and black and brown negative power lead also comes with amp.
Plug audio plug into left or right channel socket connect speaker wires to corresponding out put terminals.
Amp has mounting holes I enlarged one of them so I could use one of the old voice control mounting bolts to mount it under the nav unit.
I dialled up my customer service on phone and used the recorded message to adjust the volume turned it right down on steering wheel buttons then turned the amp up to a point where I could here it from back of car. Then you can adjust it on the steering wheel to your desired level.
I found I was picking up some interference on the set up so fitted ferrite rings on both speaker leads to the amp that stopped it.

The amp has an led display but it doesn’t keep the car awake have had no problems with mine.