cbrasian

sounds like a parasitic draw on the system use a multimeter to hunt the damn thing down. Also use it to test the battery and the alternator and you will find your problem.

Nova

iTrader: (21)

That's a good way to damage your alterntor or even worse one of the very expensive electrical components on our cars

To the OP do u have access to a multimeter

good2go

iTrader: (6)

Yeah, my bad.
I misread your OP and assumed it discharged only when you were driving it at night. Sorry for the confusion.

topdog849

iTrader: (1)

i havent read this thread other then the first post so sorry if its alrdy been said but your battery has a bad cell, i just experienced the exact same thing last week. i was lucky mine was still in warranty. it wouldnt be your alternator unless your battery light is flashing

O. L. T.

iTrader: (17)

now re-read the op again.

1jzchris

did you find what the problem was. im having the same problem on my 92 sc400. New alternator and different battery. Battery drains if park overnight will start but is very very weak and sometimes i have to let the key go and try again and it will sound strong like it got a charge.

TPIOlds

I am having this problem also???????????????????

KarateDoc

Okay here is what you do in order to diagnose the problem. Go to radio shack and buy a 1 ohm 10 watt resistor about a few bucks. Remove the negative cable from your battery and connect one end of the 1 ohm 10 watt resistor to the negative terminal of the battery and the other end to the negative battery cable. Then connect your voltmeter across the resistor. Then read the voltage. You should have a very small reading maybe 10-35 millivolts 0.010-0.035 volts. Anything more than that you will have a parasitic draw. Be sure to hae your door closed and the dome light off when checking.

Most of the time this will read about .5 - .7 volts or more if you have a problem. Then go to your fuse panel and remove one fuse at a time until you find the culprit. Then the next step is to get a wiring diagram and trace that circuit.

It takes a while but can be done. Just takes patience.

I hope this helps.

SexyLexy

I have had every imaginable problem with my car, here's my advice:
Get the alternator tested, it's FREE!
Make sure your trunk light is not staying on while the trunk is closed, I know it sounds stupid but my trunk light stays on so I have to keep it unPlugged

1jzchris

Mine turn out to be a bad battery,which was purchased like 1 month before. it was showing 10.8volts i swapped it with my friends battery from his Accord which was showing 12.4volts. since then i have had no problem or or my friends Accord.

TPIOlds

I think I found my problem, it was a bad body ground.
Try removing the ground cleaning the contact area then reattach the ground.

Lexus_SC4

Just wondering where the 'body ground' is on these cars.

Thanks.

BigBang

iTrader: (1)

I had the same problem too.. but after i swapped no more problems. Could be alternator or something electrical

bleedspeed

possible relay or actuator staying open? i would say have you installed any at all aftermarket electronic components? such as stereo,alarm. look there first if so. if not then follow the fuse check instructions by olt he knows what he be talkin bout! and make sure all engine grounds are clean and tight. alternator and battery test at a parts house. might be a good time to go ahead and upgrade your battery cables too. with new gold contacts. one of the first things i do to a new car is address all battery wiring. because old wiring is begging for battery/alternator failure. it is one of the most common no start problems ever. i like to upgrade hot and ground cables to 4 awg or bigger oxygen free car audio wire.

scENFORCER

Recently I've been having battery/alternator problems myself. Xcept my problem was the car would sometimes die when I came to a stop at a red light. I replaced the alternator, and did the 'big 3 ground' at my shop.
Here's where I'm worries though, although I have a carPC, my car draws 0.08 amps when the car and carPC are completely turned off. My audio guys say this is really high and will kill my battery if I leave my car parked for a few days..
Since I replaced the alternator the car has been running fine, but I'm worried the problems will return because the 'D' in my dash dims when I come to a stop.
Any suggestions?