Suzuki Ignis battery problems

[Peregrine]

Hi,
I have an old Suzuki Ignis 1.3 automatic 5dr 2002 and recently fitted a Sony stereo to replace an old broken one that jumped.
The car had a new battery that was fully charged and I bought the correct wiring adaptor via Ebay.......I fitted the stereo and left the car overnight and the following morning the battery was flat even though the stereo/heater/lights etc were all off correctly and only thing flashing was the alarm LED (as normal) I repeated the above 3 times in a week and have had virtually the same problem ie flat battery.
I have always had new cars and the little Ignis is just for taking my dog to the beach (don`t want our other decent cars messing up) I only do local trips of around 10 miles in the Ignis but i expected the battery to last longer and not need charging every other day? I have done the same with another battery and again same result so it must be something to do with the stereo as the problem wasn`t there before the new Sony headunit went in.
Does anyone have any tips to try before i push the sodding car into the sea! ?

I had always wanted a classic car one day but if this is the way old cars are then I will stick to modern cars lol

 

[Burnerman]

Disconnect the stereo and see if the battery retains it's charge.....something is obviously remaining live but even so, I'd expect the battery to still last longer than this.
John

 

[DaveHerns]

Maybe you have the stereo live and memory leads crossed? Red and yellow , I think. Pull the multiplug out of the stereo and see if your battery stays charged.

 

[Peter.N.]

I had a similar problem with a C5, in fact I bought the car very cheap because of it, after a lot of faffing about I found that the car had been fitted with an aftermarket (or secondhand) Blaupunkt radio, the plugs were all standard and fitted, when I disconnected it all my troubles dissapeared - well the ones related to the car anyway.

Peter