95 SC300 Battery not charging, but batt and alt check out - Club Lexus Forums


Go Back   Club Lexus Forums > Lexus Model Forums > SC Models > SC- 1st Gen (1992-2000) > Performance & Maintenance
Log In 

95 SC300 Battery not charging, but batt and alt check out

Reply
 
 
 
 
Thread Tools Search this Thread
Old 07-02-14, 01:44 AM   #1
WightBoy
Driver School Candidate
Trader Score: (0)
 
WightBoy's Avatar
 
Join Date: Feb 2014
Location: SC
Posts: 3
Default 95 SC300 Battery not charging, but batt and alt check out

Heya, guys. I've been working on this problem for a bit, and it's driving me nuts. I hate to ask for help, but sometimes we gotta suck it up.

My battery is not being charged consistently. Alternator replaced 3 mos ago, second time in 3 years. According to Advanced, battery and alternator are fine (battery will hold a charge, alt was cranking out 14 volts with max load when they tested.) If I trickle the battery, I can run the car for hours, but charge steadily declines. Watching the battery with a multimeter attached, I lose a tenth of a volt every minute or so when car is running.

There is no parasitic drain that I can detect, just no charging. I have an oil leak that does get into the alt and even into the connector, but I'm not sure where to hook the multimeter up to test any of that. I don't have a good diagram or manual, and can't afford them, so I was hoping someone would have a decent idea. Trying to trace the route from the alt to the battery, but the space is so tight, it's tough to do with no lift or manual.

ANY ideas would be helpful, esp since I will be without backup transport in a matter of hours.

Thanks for reading, and for any thoughts!
WightBoy is offline   Reply With Quote
Old 07-02-14, 02:43 AM   #2
jorgeL
Driver School Candidate
Trader Score: (0)
 
Join Date: Jun 2014
Location: ca
Posts: 8
Default

Quote:
Originally Posted by WightBoy View Post
Heya, guys. I've been working on this problem for a bit, and it's driving me nuts. I hate to ask for help, but sometimes we gotta suck it up.

My battery is not being charged consistently. Alternator replaced 3 mos ago, second time in 3 years. According to Advanced, battery and alternator are fine (battery will hold a charge, alt was cranking out 14 volts with max load when they tested.) If I trickle the battery, I can run the car for hours, but charge steadily declines. Watching the battery with a multimeter attached, I lose a tenth of a volt every minute or so when car is running.

There is no parasitic drain that I can detect, just no charging. I have an oil leak that does get into the alt and even into the connector, but I'm not sure where to hook the multimeter up to test any of that. I don't have a good diagram or manual, and can't afford them, so I was hoping someone would have a decent idea. Trying to trace the route from the alt to the battery, but the space is so tight, it's tough to do with no lift or manual.

ANY ideas would be helpful, esp since I will be without backup transport in a matter of hours.

Thanks for reading, and for any thoughts!
Do you have any aftermarket stereo, audio amplifiers, anything aftermarket electrical..double check those..I work at a audio shop and u will be surprised when an amp comes in and is not turning off.. (from other store installs) there was a guy who bought a car that the previous owner installed a gps. That was sucking power but it was hiddin..had to dissect the car to find.
jorgeL is offline   Reply With Quote
Old 07-02-14, 05:43 AM   #3
carsmypnis
Rookie
Trader Score: (1)
 
Join Date: Dec 2006
Location: florida
Posts: 98
Default

make sure your battery terminals are tight and clean. ull be surprised what that will do
carsmypnis is offline   Reply With Quote
Old 07-03-14, 03:04 PM   #4
WightBoy
Driver School Candidate
Trader Score: (0)
 
WightBoy's Avatar
 
Join Date: Feb 2014
Location: SC
Posts: 3
Default

Haven't added any aftermarket parts to the poor girl yet, and I got it from an elderly woman, so I doubt she added any. Haha. Terminals are good, just checking cables and grounds now. Is oil enough of a conductor that if there was exposed copper covered with oil that also meets the engine, could that cause a break in the connectivity?
WightBoy is offline   Reply With Quote
Old 07-03-14, 10:32 PM   #5
eknine9
Lexus Test Driver
Trader Score: (8)
 
eknine9's Avatar
 
Join Date: Mar 2012
Location: TX
Posts: 883
thedailykeef flirtcheap
Default

Quote:
Originally Posted by WightBoy View Post
Haven't added any aftermarket parts to the poor girl yet, and I got it from an elderly woman, so I doubt she added any. Haha. Terminals are good, just checking cables and grounds now. Is oil enough of a conductor that if there was exposed copper covered with oil that also meets the engine, could that cause a break in the connectivity?
Yes, oil leaking onto your alternator can kill it.
My SC300 had the same leak and destroyed my alternator as well.
It's either your distributor needs new o-ring seals or your distributor is actually cracked.
__________________
http://i1182.photobucket.com/albums/x455/eknine9/SCBanner.png
-1992 5-speed SC300,
-BC Racing Coilovers, Supra Front LCA's, 19x9.5+25 Privat Reserv rims
-LXCC Touchscreen Climate Control, Tanin Gauge Cluster, Viper alarm
-TSX Retrofit w/55 watt 4500k DDM HID's, and 3000k HID Fogs
-97 front Vertex lip, JIC magic rear and sides, 15% tint, 97 tails
Magnaflow Exhaust
eknine9 is online now   Reply With Quote
Old 07-07-14, 05:33 PM   #6
WightBoy
Driver School Candidate
Trader Score: (0)
 
WightBoy's Avatar
 
Join Date: Feb 2014
Location: SC
Posts: 3
Default

I didn't even think about looking at the distributor. It seems clean, but that might be incidental. Thanks, eknine9, I'll send you a six-pack if that turns out to be the ultimate problem! Yesterday and today the battery was charging fine. This evening, the streak seems to have ended again.
WightBoy is offline   Reply With Quote
Old 07-07-14, 09:09 PM   #7
Vrank
Lexus Test Driver
Trader Score: (4)
 
Vrank's Avatar
 
Join Date: Feb 2011
Location: TX
Posts: 953
Default

Try adding a decent sized ground cable or replace the current one. Corrosion can travel down the cable under the sheathing quite a bit and cause headaches
Vrank is offline   Reply With Quote
Old 07-08-14, 11:34 AM   #8
eknine9
Lexus Test Driver
Trader Score: (8)
 
eknine9's Avatar
 
Join Date: Mar 2012
Location: TX
Posts: 883
thedailykeef flirtcheap
Default

Quote:
Originally Posted by WightBoy View Post
I didn't even think about looking at the distributor. It seems clean, but that might be incidental. Thanks, eknine9, I'll send you a six-pack if that turns out to be the ultimate problem! Yesterday and today the battery was charging fine. This evening, the streak seems to have ended again.
If there's no oil on the metal distributor plate that should be sitting underneath and slightly behind (towards the rear of the car) the distributor then you can rule out a dizzy leak as the culprit.
__________________
http://i1182.photobucket.com/albums/x455/eknine9/SCBanner.png
-1992 5-speed SC300,
-BC Racing Coilovers, Supra Front LCA's, 19x9.5+25 Privat Reserv rims
-LXCC Touchscreen Climate Control, Tanin Gauge Cluster, Viper alarm
-TSX Retrofit w/55 watt 4500k DDM HID's, and 3000k HID Fogs
-97 front Vertex lip, JIC magic rear and sides, 15% tint, 97 tails
Magnaflow Exhaust
eknine9 is online now   Reply With Quote
Old 07-09-14, 10:03 PM   #9
pioww
Rookie
Trader Score: (0)
 
Join Date: Feb 2008
Location: Northeast
Posts: 60
Default

Do the big three and check the wire going from the alt. to the bat.
pioww is offline   Reply With Quote
 
 
 
Reply

Similar Threads
Thread Thread Starter Forum Replies Last Post
Charging system help!!! Guccigrl ES - 1st to 4th Gen (1990-2006) 10 06-19-15 07:34 PM
Dual Alternator Setup NYGS300 GS - 2nd Gen (1998-2005) 15 04-29-15 01:20 PM
UCF20/21 Charging issue lexmoose LS - 1st and 2nd Gen (1990-2000) 16 02-02-15 11:39 AM
New guy with a serious charging issue ScottsGT ES - 1st to 4th Gen (1990-2006) 3 07-15-14 07:33 AM
Low voltage after new battery and new alternator? bass911 LS - 1st and 2nd Gen (1990-2000) 45 09-20-13 10:10 PM


Tags
alternator, battery, electrical problems

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not 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 Off
Pingbacks are Off
Refbacks are Off

Forum Jump


All times are GMT -7. The time now is 08:00 AM.

Copyright © 2000-2015 Internet Brands, Inc. All Rights Reserved
Privacy Policy | Disclaimer | Terms of Use | JOBS


Get all contact info