Quick question: On a 2 week battery drain
Quick question: On a 2 week battery drain
As some of you know, I do not use my SC very much at all. It get's probably around 500-800 miles a year if even. Anyway, way back in May of 2012, I replaced the battery with an Everstart Walmart battery. Recently though, if I don't use the SC for around 1 1/2 weeks-2, the battery will not provide enough cranking amps to start the V8. There is a drain somewhere, but I don't know where. My Q is, has there been any known drainage areas on the SC? I was thinking the CD player light in the trunk, but that isn't very big and couldn't drain a battery that fast...or can it?
I shut the doors all of the way and see that the "open door" light is not illuminating so that isn't it.
Any ideas are appreciated. OR, if there has already been a thread on this, could somebody show it to me? I can't find one...Thanks!
I shut the doors all of the way and see that the "open door" light is not illuminating so that isn't it.
Any ideas are appreciated. OR, if there has already been a thread on this, could somebody show it to me? I can't find one...Thanks!
Rookie
Joined: Jan 2013
Posts: 61
Likes: 0
From: Ca
I had that simiar problem as well. Is it cold where you live right now. I know that in cold weather if the battery doesn't have as much cold cranking amps it will cause a problem. I know that the standard antitheft system drains some battery and or if you have an aftermarket alarm system on. I know that when my SC would sit for 1 to 2 weeks at a time and we drove it once it wasn't enough to charge a battery unless we drove it around for like 20 mintues or longer non stop. If you drive it around town for small trips and start it up alot then it doesn't charge enough. Then what happens is you let it sit for another two weeks and then this type of cycle kills the battery over time. I use a battery charger every now and then to help solve this problem so I don't ruin the battery.
My 95' Sc400 did not start 4 times this winter since I purchased it in december. I assumed a drain as well but i was unsuccessful at finding one. I went to purchase a new battery but was told it was good (as was my alternator according to Sears tech).
I purchased a and a the next day.
Low and behold, it was my alternator.
I replaced it and have not had to use my backup battery since.
Last edited by Studiogeek; Feb 26, 2013 at 11:18 AM.
I have also been finding out about more about this problem. I think it also cpoul dbe a faulty or going oout ECU. If the battery and alternator has been checked and good, then look at the ECU caps.
Pole Position
Joined: Jan 2007
Posts: 2,169
Likes: 11
From: MD
This will continue to happen the draining of the battery, if you let the Sc sit for long periods without starting/running. It's a combination of things from the ejection/security light, on the CD unit & locking the doors. Finally you have the memory chip, for things like the clock etc. continuously drawning current from the battery. The only solution to your problem is to buy a battery floater charger as I did, when my Sc is dormant. http://www.harborfreight.com/checkout/cart/
Last edited by Teal Sc400; Feb 26, 2013 at 11:52 AM.
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I had that simiar problem as well. Is it cold where you live right now. I know that in cold weather if the battery doesn't have as much cold cranking amps it will cause a problem. I know that the standard antitheft system drains some battery and or if you have an aftermarket alarm system on. I know that when my SC would sit for 1 to 2 weeks at a time and we drove it once it wasn't enough to charge a battery unless we drove it around for like 20 mintues or longer non stop. If you drive it around town for small trips and start it up alot then it doesn't charge enough. Then what happens is you let it sit for another two weeks and then this type of cycle kills the battery over time. I use a battery charger every now and then to help solve this problem so I don't ruin the battery.
Sorry to re-mention something you have already 'volleyed" but.....
My 95' Sc400 did not start 4 times this winter since I purchased it in december. I assumed a drain as well but i was unsuccessful at finding one. I went to purchase a new battery but was told it was good (as was my alternator according to Sears tech).
I purchased a backup battery and a cig lighter volt meter the next day.
Low and behold, it was my alternator.
I replaced it and have not had to use my backup battery since.
My 95' Sc400 did not start 4 times this winter since I purchased it in december. I assumed a drain as well but i was unsuccessful at finding one. I went to purchase a new battery but was told it was good (as was my alternator according to Sears tech).
I purchased a backup battery and a cig lighter volt meter the next day.
Low and behold, it was my alternator.
I replaced it and have not had to use my backup battery since.
thanks for the suggestion(s) Mark. It is greatly appreciated.This will continue to happen the draining of the battery, if you let the Sc sit for long periods without starting/running. It's a combination of things from the ejection/security light, on the CD unit & locking the doors. Finally you have the memory chip, for things like the clock etc. continuously drawning current from the battery. The only solution to your problem is to buy a battery floater charger as I did, when my Sc is dormant. http://www.harborfreight.com/checkout/cart/
Thanks for all of the ideas, all of your suggestions are greatly appreciated and I'm not just saying that.
Pole Position
Joined: Oct 2012
Posts: 226
Likes: 0
From: missouri
well do what i do! put in 100amp power cut off in. so if i dont use the car i trip the button and no power to anything. just a thought works great as a power cut off at the track just in case as well.
(Deleted ebay Link; read forum rules, you can post pictures from there but not the link)
(Deleted ebay Link; read forum rules, you can post pictures from there but not the link)
Last edited by Ali SC3; Feb 26, 2013 at 01:35 PM. Reason: removed ebay link; please post picture instead
My SC does the exact same thing in the cold and it drove me crazy among other ecu problems.
As Teal said its a combo of all the electronics working because I replaced my battery with a new one twice, kept doing the same thing it would have full energy, until the first time I let it sit over a week.
before the first battery replacement I had the alternator tested and it passed easily. If I drive the car every day it never happens, so I think the alternator is ok, although a new one never hurts.
I heard some of the models have a switch under the steering column to turn off the remote stuff, which you are supossed to do if it sits for long periods of time, so Lexus was aware of battery drain on these cars. I dont think all the models have the switch though, but what I do is I installed a battery disconnect fuse right next to the battery. when it sits for long, I just push the button and the battery is disconnected. even If I leave it sitting for weeks when you flip the switch back you haven't had any drain and it starts right up.
This is what I use
Its called 200 AMP Circuit Breaker, usually used for big car setero's but it works perfect for the car battery, just get the right gauge. Also its nice cause the circuit trips if you short anything out, and you can just fix the problem and flip it back on instead of having to go the auto parts store to get a 100-200 amp fuse (if your battery is relocated or you have amps in the car) or keep a stack in the glove box (very annoying and those fuses are expensive to keep replacing).
As Teal said its a combo of all the electronics working because I replaced my battery with a new one twice, kept doing the same thing it would have full energy, until the first time I let it sit over a week.
before the first battery replacement I had the alternator tested and it passed easily. If I drive the car every day it never happens, so I think the alternator is ok, although a new one never hurts.
I heard some of the models have a switch under the steering column to turn off the remote stuff, which you are supossed to do if it sits for long periods of time, so Lexus was aware of battery drain on these cars. I dont think all the models have the switch though, but what I do is I installed a battery disconnect fuse right next to the battery. when it sits for long, I just push the button and the battery is disconnected. even If I leave it sitting for weeks when you flip the switch back you haven't had any drain and it starts right up.
This is what I use
Its called 200 AMP Circuit Breaker, usually used for big car setero's but it works perfect for the car battery, just get the right gauge. Also its nice cause the circuit trips if you short anything out, and you can just fix the problem and flip it back on instead of having to go the auto parts store to get a 100-200 amp fuse (if your battery is relocated or you have amps in the car) or keep a stack in the glove box (very annoying and those fuses are expensive to keep replacing).
well do what i do! put in 100amp power cut off in. so if i dont use the car i trip the button and no power to anything. just a thought works great as a power cut off at the track just in case as well.
(Deleted ebay Link; read forum rules, you can post pictures from there but not the link)
(Deleted ebay Link; read forum rules, you can post pictures from there but not the link)
My SC does the exact same thing in the cold and it drove me crazy among other ecu problems.
As Teal said its a combo of all the electronics working because I replaced my battery with a new one twice, kept doing the same thing it would have full energy, until the first time I let it sit over a week.
before the first battery replacement I had the alternator tested and it passed easily. If I drive the car every day it never happens, so I think the alternator is ok, although a new one never hurts.
I heard some of the models have a switch under the steering column to turn off the remote stuff, which you are supossed to do if it sits for long periods of time, so Lexus was aware of battery drain on these cars. I dont think all the models have the switch though, but what I do is I installed a battery disconnect fuse right next to the battery. when it sits for long, I just push the button and the battery is disconnected. even If I leave it sitting for weeks when you flip the switch back you haven't had any drain and it starts right up.
This is what I use
Its called 200 AMP Circuit Breaker, usually used for big car setero's but it works perfect for the car battery, just get the right gauge. Also its nice cause the circuit trips if you short anything out, and you can just fix the problem and flip it back on instead of having to go the auto parts store to get a 100-200 amp fuse (if your battery is relocated or you have amps in the car) or keep a stack in the glove box (very annoying and those fuses are expensive to keep replacing).
As Teal said its a combo of all the electronics working because I replaced my battery with a new one twice, kept doing the same thing it would have full energy, until the first time I let it sit over a week.
before the first battery replacement I had the alternator tested and it passed easily. If I drive the car every day it never happens, so I think the alternator is ok, although a new one never hurts.
I heard some of the models have a switch under the steering column to turn off the remote stuff, which you are supossed to do if it sits for long periods of time, so Lexus was aware of battery drain on these cars. I dont think all the models have the switch though, but what I do is I installed a battery disconnect fuse right next to the battery. when it sits for long, I just push the button and the battery is disconnected. even If I leave it sitting for weeks when you flip the switch back you haven't had any drain and it starts right up.
This is what I use
Its called 200 AMP Circuit Breaker, usually used for big car setero's but it works perfect for the car battery, just get the right gauge. Also its nice cause the circuit trips if you short anything out, and you can just fix the problem and flip it back on instead of having to go the auto parts store to get a 100-200 amp fuse (if your battery is relocated or you have amps in the car) or keep a stack in the glove box (very annoying and those fuses are expensive to keep replacing).
yeah alot of people use those for various reasons, Its either that or a trickle charger, but I don't like having the trickle constantly connected to the battery while its connected to the car. I keep a full charger though for the times when I forget to disconnect it and it sits long enough to struggle to start, or I will disconnect it (via the switch) and then use the trickle, but I found disconnecting was all that was needed.
my car was notorious for this happening until i bought big daddy battery.
ODYSSEY PC 1500 group 34r size. my cars been sitting for over a year now and when i went back to the states it started right up. doesnt get cold in GA though... even if it did the battery has 850cc at like -40 degrees F
ODYSSEY PC 1500 group 34r size. my cars been sitting for over a year now and when i went back to the states it started right up. doesnt get cold in GA though... even if it did the battery has 850cc at like -40 degrees F
yeah alot of people use those for various reasons, Its either that or a trickle charger, but I don't like having the trickle constantly connected to the battery while its connected to the car. I keep a full charger though for the times when I forget to disconnect it and it sits long enough to struggle to start, or I will disconnect it (via the switch) and then use the trickle, but I found disconnecting was all that was needed.
my car was notorious for this happening until i bought big daddy battery.
ODYSSEY PC 1500 group 34r size. my cars been sitting for over a year now and when i went back to the states it started right up. doesnt get cold in GA though... even if it did the battery has 850cc at like -40 degrees F
ODYSSEY PC 1500 group 34r size. my cars been sitting for over a year now and when i went back to the states it started right up. doesnt get cold in GA though... even if it did the battery has 850cc at like -40 degrees F
Pole Position
Joined: Jan 2007
Posts: 2,169
Likes: 11
From: MD