Hey guys,

I am having a curious issue with my '00 S2000. Recently the battery has been very weak, and it will not start the car after sitting for more than 24 hours. The battery is a new Optima Yellow-Top, replacing the old Optima Yellow-Top I had under warranty after two years. I replaced the battery after it went stone-dead on me one day. When putting the new battery in, I noticed that the positive terminal post collar (the thing that connects the battery cable to the post) was stretched and would no longer tighten on the post properly. I left it not-quite-tight-enough for a few days, during which time my starts were very weak, and the car needed to be jumped a time or two. I eventually replaced it with one of these:



In doing so, I noticed some slight corrosion build-up inside the battery cable. Everything is tight now (as electrical connections should be), but the problem persists. If I drive the car for 10 minutes, run in the store for a few minutes, and come back out, it starts right up. After working an 8-10 hour day, it's weak, but starts. After a weekend without driving, it is too weak to start.

So, my question:
Would you attribute this to a bad battery cable, or could a faulty battery be to blame? If the battery cable is the believed culprit, is the EPS Sub-Wire (#7) what I should be looking to replace?

Also to note, I have all interior accessory lights off, have checked and ensured that the trunk light is not staying on, and have all accessories (HVAC/radio) off before turning off the car.

 

Do you have any aftermarket electronics install? If so, maybe one of them is hookup wrong and is draining the battery. Usually if you install an aftermarket electronic using the power behind the stereo, it will drain the battery.

 

I have an aftermarket head unit (no amp, just the two stock speakers), but it has been on the car since I bought it over 3 years ago, and this problem is new. In light of the problem, I always make sure the head unit is off as well. Still think that could be it?

 

I meant other than an aftermarket headunit. Do a battery drain test. Here's a link http://honda-tech.com/showthread.php?p=48652070

 

I also had a battery draining problem - by the process of elimination I discovered that my remote was draining the battery, I don't know why, but after not using the remote, my battery has remained charged. I don't know why, if anyone does know, please tell me. I haven't used my remote for the past 6 months and battery is fine.

 

Which remote?

 

The "keyless entry" remote.

 

Hey guys,

Any update on this? I too am having this issue.

Thanks

 

If you have a multi-meter try this test to measure the amps being drawn with every thing shutdown. I saw one member reporting that his s2000 drew about 7-8 milliamps when it was shutdown and nothing running.

http://www.ehow.com/how_2249402_find...ery-drain.html