Nearly over this car...

okay so after my previous issues, I now have more. Im not very happy with this thing either

so after i installed a gauge into my car I noticed that the battery would go flat after 3-4 days. I unplugged the gauge but it kept happening
It went flat before I went on my trip, which means i didnt drive it for 3 weeks. When i got back i jump started it (It took 10 minutes of charging from my dads subi)
We took it for a 20 minute drive, next day it was flat. I thought maybe we didnt charge it up enough.
had the battery tested and its 100% okay.
 
Decided i would charge the battery up over night using a battery charger plugged into mains. also disconnected everything aftermarket that had been put in the car.
it charged for about 8 hours, and started straight away. took it for a 10 minute drive, parked it
Next day it was flat

Im at my wits end with this car. Ive also found out it has rust on the roof and the water pump is on its last legs, not to mention the rear mains seal leak.
I feel conned and i think I have bought the dodgiest mr2 on the market.

If anyone can help me that was great, even if theres someone that lives near by that could give me a hand. I live near capalaba

Thanks 

Eric 
 

Get yourself a multimeter. As well as above tests.

To check if you have something draining the battery with the car off.
Remove positive lead from battery, and connect meter between positive and battery.
Should have very small current draw, maybe around 10mA or less.
If you have excessive current pull fuses until it goes away.

Intermittent door light or boot light is a common one.

OP - mine had rust in the roof too: http://www.mr2australia.com/MR2play/tm.aspx?m=53250
got it fixed because these cars are too nice to have rust. 

Hey guys, thanks for the replies.

I have to go pick up a new multimeter since mine is wrecked and dosnt work, so will be doing that ASAP.
Obviously I will be getting the rust fixed. my neighbour is a boilermaker by trade so he might be keen to do a cash job. plan is to cut it out and replace it. not too bad i guess

And yes it is too nice to let it go lol :P

Oh yeh when my alternator was on it's way out, 3 instrumental panel lights came on, namely: 
Battery, catalytic converter (box with squiggly lines lol), and something else I forgot. Voltmeter on the car should tell you anyways how much charge you have left. Make sure it doesn't die in traffic!
(I had to keep it revving like a douche at the lights but it got me home inches before my driveway lol)

Unless it's a V6 
P.S Mine is not a V6 lol

if you can get a hold of a load tester load test the battery once fully chared by the battery charger, that will tell you also if the batter is stuffed.
 
to check the Alternater charge start the car and with your multi metre test across the two terminals on the battery claps. it should read around 13-14.5v thats charge volts, then turn your head lights on and high beam if it drops below 12v your alternater is stuffed

270 CCA!!?? It's no wonder your car was hard to start. Even 350 CCA was a struggle for mine sometimes. My AC Delco dry cell is about 450 CCA which it lists for the SW20 3SGE. I Think that's the minimum