Electrickery help needed

[Big Mouse]

I just had a new cd radio installed in the merc but it needs to be connected up to the ignition so it goes off when the ignition is turned off; at the moment its on a pemanent live so I have to remember to turn it off.

If left to my own devices i'll end up killing the radio/car/myself/something so anyone who knows what they are doing would be very welcome to sort it out for me; tea and bacon sarnies supplied (or coffee and crosissants if you're that way inclined)

[Andy]

Had a similar issue when I changed for a Sony Unit to an Alpine. Turned out the ISO harness needed a quick link swapping over from a permanent live to a ACC live.

In my case it was literally a case of swapping was was a red to red on the harness to a red to yellow (common colour I believe for ACC supply).

I would offer to help but with my recent exploits in car electrics a might set the thing on fire!

What make and model is it?

[Andy]

Ah what I should also add is, that when I changed from permanent feed to acc on my old sony it did mean that every time I turned the ignition off it lost all my radio presets after laying it up for a day or two..

[Big Mouse]

Quoting: Andy

Ah what I should also add is, that when I changed from permanent feed to acc on my old sony it did mean that every time I turned the ignition off it lost all my radio presets after laying it up for a day or two..

I could probably do that! Gator already sent me some sound advice so i'll try that first, thanks

[ianjpage]

Easy one to sort

I assume that the original radio kept it's memorys etc and switched off with the key?   if so then as andy says should be a simple check with a multimeter and some re-do of wires and jobs a good un!

Happy to help if needed

[philoldsmobile]

what model merc? it could be really really simple unless the factory fit stereo is funky (a - la jaguar XJ40 - they had a weird ring system for the speakers)

should just be a case of finding a switched live.

[philoldsmobile]

Quoting: Andy

Ah what I should also add is, that when I changed from permanent feed to acc on my old sony it did mean that every time I turned the ignition off it lost all my radio presets after laying it up for a day or two..

you got the switched and permanent lives round the wrong way. swap em over and all will be good..

in a standard ISO connector you have a permanent live (usually red) switched live (usually yellow) negative (black) an antenna feed (usually blue) and four sets of speaker outputs, normally with the trace on positive.

[Big Mouse]

its a 2002 320 clk

The original connection - done at halfords - didn't work for some reason so it had to go on a permanent live. They'll do it for free but it means leaving it with them for half a day and I can't be arsed with the playing about mid week to be honest

[philoldsmobile]

the source of the switched live is dead then, most likely the radio fuse (they probably popped the fuse installing it knowing hellfrauds!)

should be a 5 min job.