Battery drain?? Help!! - Lexus IS Forum
User Tag List

LinkBack Thread Tools
post #1 of 3 (permalink) Old 04-04-2016, 08:15 PM Thread Starter
Join Date: Apr 2016
Posts: 1
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Battery drain?? Help!!

So i picked up a 2001 is300 on friday, and i started it saturday and sunday no problem. On sunday we lifted up the rear to replace the parking brake shoes and took apart the passenger rear side and left it off to relace it tuesday. Sunday night i noticed the clock light by the a/c controls was still on despite the keys not being in. Today i went to start the car and the battery was completly dead. No lights or anything.i tried charging the "used" battery but it did not want to charge unless i took of the positive cable from the then started charging fast. I also noticed that when i take off the negative cable and reconect it, the two abs relays click. Is this normal? Any ideas what is draining the battery? Maybe the battery itself is bad. Idk at this point.... Any help would be much appreciated.
Futurestance is offline  
Sponsored Links
post #2 of 3 (permalink) Old 06-26-2019, 12:13 AM
Join Date: Jun 2018
Posts: 23
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 10 Post(s)
I put in a bigger battery and turns out the posts were contacting the hood and draining batt. Put a peice of rubber door mat over it and all better.
Jason T Shaw is offline  
post #3 of 3 (permalink) Old 06-29-2019, 02:43 PM
Join Date: Nov 2012
Location: New Zealand
Posts: 525
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 131 Post(s)
I’m no electrical expert but If the battery and alternator are good, most drain issues I have seen have been either some issue with aftermarket items or with incorrect wiring or earthing. I’ve seen head units and amplifiers wired up to the wrong power supply or a wire that mimics the earth instead of making a new earth drain them, I had a Honda where there was an issue with the aftermarket alarm would drain the battery in a week if the car wasn’t used.

I would start with making sure the basics are right, disconnect everything that isn’t OEM, then check the charging system and the battery is working ok. Then start looking for electrical leakage.

2001 Altezza Gita JCE10
Pnut00 is offline  
Sponsored Links

  Lexus IS Forum > Lexus IS > Basic Help & Repair

Quick Reply

Register Now

In order to be able to post messages on the Lexus IS Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.


Confirm Password:
Email Address
Please enter a valid email address for yourself. If your address is invalid, you will likely lose access to the site.

Email Address:


Current users viewing this Thread: 1 (0 members and 1 guests)
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page

Similar Threads
Thread Thread Starter Forum Replies Last Post
Loose Battery Terminals And Loose Battery Phabeon General Discussion 6 02-07-2016 10:27 AM
2006 IS 250 Having Trouble with battery and starting PSingh Basic Help & Repair 0 01-20-2016 06:03 PM
OEM Or Aftermarket Battery? Phabeon General Discussion 14 01-05-2016 04:37 PM
bad relay killed my battery? justYncredible Basic Help & Repair 0 01-02-2016 08:02 PM
2001 IS300 battery problem duhbreadman General Discussion 7 12-17-2015 02:30 PM

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

For the best viewing experience please update your browser to Google Chrome