Ok, ive gone through 3 Optima yellow top battery warrenties... They all die over night, so I switched from Optima ($300CDN) to Motomaster ($70CDN)a canadian brand battery... same sh*t.
So I think ive got a short somewhere... where do I start..?

 

You're four (4) Batterys late on THAT question.
Don't take this the wrong way, but I don't question the intelligence of the battery

You obviously have either a direct short, or a component staying on; even with the car turned off.

P

 

Well I wasnt questioning the intelligence at all, The mechanic at the Cosco that I purchased it from had told me that they had a bunch of people complaining bout the batteries... Apperently they just wouldnt hold the charge, bad shippment. So I assumed that I was just getting unlucky and receiving all the bunk batteries. It was when I switched to another brand that I became concerned.
I do have an amp in the back that is always on. That was what I thought was the problem, but then I was told that the only power that was being sent to the amp was for the power indicator LED. So for fun I disconected the amp... same thing.
So thats not the problem...
Where should I start, I know there are a million possibilities..

 

You HAVE had the Alternator checked? Right?

Get to Radio Shack (or Canadian Equivilent) and pick up either a 12v LED, 12v Test light or a bulb holder with leads for (You Guessed It) a 12v bulb.
I know it will sound tedious, but you're going to substitute (one at a time) the 12v test impliment in your hand for a fuse. (with the key off).
If there is anything staying on in the vehicle, the lamp/LED will light as it completes the circuit. That will identify which circuit you have the problem with. You;ll then have to determine what on that circuit is causing the problem.

 

Alright, thanks dude.... This will be fun.. Maybe getting the alternator checked is a good idea too.

 

Juccord: Canadian Tire battery no good bro. its winter time put a good one, check for that short, you good to go.

 

Well normally my car would already be in the garage, but my teal Escort wagon dont run anymore, needs new tranny. Motomaster batteries are actually good quality batteries, 680cca, 9 Year no questions asked warranty for $70, compared to my Optima Yellow top, 720cca, 1 Year warranty for $300.. Umm, I dont mind the Motomaster.
Either way, I hope ill figure this **** out, I just bought one of those portable battery boosters cause im sick of askin for a boost all the time.

 

A $300 battery you gotta to be f-ing kidding! Let alone for a one year warranty. I personally go with the cheapest batteries I can find with a long warranty (like excide at Sam's Club). Keep your receipt and there is no way you'll ever have to pay full price for another battery again.

I seconde the alternator. Check your ground wire/cables too. You'd be surprised what little amount of corrosion it takes to kill your amperage.

 

3? well, i strongly agree with the others, check your charging system.

it's not very likely to be the battery