Specs: 92 sc300 ( 169 k on chasis )
1 jz tt motor ( 50 k)


i been having this problem for couple weeks now and still havent been able to figure it out. i had replaced 2 new battery already. the problem is that after everytime i replaced a new battery the car works fine but while i have my radio on while turning on my headlight. u can hear a spark sound. but when the radio is off while turning on the headlight which is fine. but the thing is that if i dont drive my car for 3-5 days the battery voltage goes from 12.86 to like 3.86 which i cant even crank the car at all. all the light are very dime. i already also changed out new battery terminals connectors as well. thanks guys.

 

I have the same issue with mine. I haven't figured out the issue. I was going to strip the car (to clean it) and test to see if anything is shorting out.

 

alternator? Maybe check the fuse box for shortcircuits?

 

na i checked the alternator and fuse box already. the alternator is good and also the fuse box is good as well. its something else draining out the battery. just not sure where its draining it from.

 

Do you have an aftermarket radio installed? I had the same issue, found out that I crossed two wires and there was constant power while the car was off. Drained my battery and killed my ALT..

 

I don't even have a radio installed...

 

na all i got is the oem radio the only after market parts on the car is hid from ebay. 1jz tt motor and a hks timer.

 

anyone got any idea?

 

bump..need to fix it plz

 

What I would do is try to restrict the area I am looking in
disconnect half the fuse box one day and see if it drains - disconnect the otehr the second day and see if it drains.

Then go from there, keep on doing it to see if it is a bad electrical part - I am not a mechanic, an electrical engineer, I would probably think that way to find my problem..

 

did you just start having this problem all of a sudden or was it after you did something.
check you HID wiring. make sure everything is grounded properly.

I would guess something on the accessory or radio lines. you could try pulling the fuse for a while and see if the battery still dies. the headlight thing doesnt narrow it down cause they mostly all share the same grounds.

 

yea i will check the fuses and stuff again. i am gonna try to pull out the radio to see if its the problem. i think its something related to the radio or hid. b/c when i turn on the headlight with the radio it made a spark sound and when its off it doesnt.

 

I had similar problem with exception of radio and the noise you mentioned. Mechanic replaced my alternator and fixed the battery drain. Why? I don't know

 

I had the same problem it was initially after i installed my HID's i had a short, i just uninstalled and then reinstalled them and havent had a problem since!

 

well i pulled out the hid already and replaced with a normal bulbs for now. the sound is gone aways. but its still draining the battery. it was at 12.68 last night when i checked before i went to bed and after 12 hours i checked it again and its at 12.26. so its still draining the battery slower then before but still draining. i dont think its my alternator b/c the car doesnt die while driving so its charging. plus i also took it to autozone for them to check on it and they said its fine as well.