Go Back   Chevrolet Forum - Chevy Enthusiasts Forums > Past Chevy Truck, SUV & Vans > S-10 & Blazer
Sign in using an external account
Register Forgot Password?

S-10 & Blazer 1982-2005
The S-10 and Blazer was arguably the most versatile and accessorizable mid-size truck and SUV on the market.
Platform: S/T-series & GMT 330

LinkBack Thread Tools
Old 12-03-2007, 10:29 AM
Join Date: Oct 2006
Posts: 4
Default S-10 Battery draining

I have a 2001 S-10 Extreme. In the past 6 months I have had to purchase 2 new batteries. The batteries have all been disharging somehow and eventually will not hold a charge. The Alternator output is fine but this seems to be happening on a more frequent basis now. I just bought a premium 750 cold cranking amps batterie and I notice it is getting week. Something odd started happening about the time this started. I notice in the morning when I go to put the key in the ignition that the Hi Beam indicator light is on dimmly even though the Hi beams are not turned on. As soon as I start the truck it goes off. Any ideas?
Register today for free or log-in if already registered to remove this ad!
Reply With Quote
Old 12-03-2007, 11:44 AM
EvansBlue's Avatar
Ride of the Month
April 2009
2000 Chevrolet Blazer
My Garage
Join Date: Jul 2007
Location: Princeton, NC, USA
Posts: 6,161
Send a message via ICQ to EvansBlue Send a message via AIM to EvansBlue
Default RE: S-10 Battery draining

Yeah I do. When the vehicle is completely shut off, with the interior light override on, do you see a slight illumination to any of the instrument panel lights? If your gear selector (PRND321) is lit up ever so slightly toward the 'P' or if any of theindicator lights glow slightly, its a short in the circuit and is indicative of a problem with the gauge cluster.Its really easy to change,but I think you may have to get some dealer advice on changing it because I'm not sure if thevehicle records mileagein the cluster or in the computer.
Brent Evans

Reply With Quote
Old 12-03-2007, 10:20 PM
CF Pro Member
Join Date: Oct 2006
Posts: 611
Default RE: S-10 Battery draining

And if it's not that:

This is referred to as " parasitic drain " , all modern vehicles will normally have a small amount of parasitic drain for the various electronic control modules and constant memory for things like stereos, etc.

The test for this :

With a Multimeter set to DC amps , without the key in the ignition, doors closed and everything OFF

1 - disconnect the Negative battery cable
2 - attach one lead from the meter to this negative cable
3 - attach the other meter lead to the negative battery point

wait a few minutes for the reading to settle ( this is for everything to re-initialize ) and observe the reading, which should be somewhere in the ball park of .010 (milliamp) to .020 (milliamp). [ 1 amp = 1000 milliamp and 1/2 amp = .500 amp or 500 milliamp ]
This will depend on what accessories your vehicle has.

If you find a high reading , for example .500 amps ( 500 milliamp ), you can do one of two things to locate which circuit is responsible for the high draw.


- leave everything connected as mentioned above
- remove one fuse at a time and see if the reading drops significantly

just remember to shut the door or disable the interior lights so they aren't on.

- reconnect the battery cable
- pull one fuse at a time
- place one lead of the meter on one terminal of the fuse socket
- place the other lead of the meter to the other terminal of the fuse socket
- observe and record the reading

This will direct you to which circuit has a problem.
Reply With Quote
Old 12-13-2007, 05:05 PM
Join Date: Jan 2007
Posts: 4
Default RE: S-10 Battery draining

My insurance company force me to get aMobilus system ( similar to On Star)Those systems that help the police find your vehicle if it gets stolen. Well for two years everytime my s-10 was idled for 3 to 4 days, the battery was drained. I replace the battery eventually but the problem resurfaced. In the winter, it was worst. Then I got a call from Mobilus asking me to bring my truck in to replace the electronic gismo. It appears that they had many problems with consumers with battery drainage. I could not get them to pay for the battery replacement but they lost a customer. I removed their system and never had problem since. My insurance company agreed.
Reply With Quote
Old 01-06-2008, 03:01 PM
Join Date: Jan 2008
Posts: 1
Send a message via Yahoo to 2JZR32F10Caddy
Default RE: S-10 Battery draining

Hey, I came across this same problem of my battery kept draining on me over night. Well, my s-10 happens to be a 96 though. I found the cause of the problem one night when I went to get something out of my truck. My drivers side sun deflector in the truck has a mirror and a light on it. Well the material around it is coming loose. I noticed the light is hard to see unless it is dark out. Well, I had to replace the sun deflector and bam, my problem was fixed. I am pretty sure this isn't the case for yours though. I thought this might be able to help somebody else out one day!
1996 dropped s-10
Reply With Quote
Old 10-27-2013, 10:49 AM
CF Beginner
Join Date: Oct 2013
Posts: 1
Default Battery draining issue?

My sons 2000 S10 has the gear selector P light up very dimly after he turns the vehicle off but the light goes away after about 10-15 seconds. I have connected a multimeter set at 10A between the negative battery cable and negative battery post and get a reading of 3.66 until I remove the fuse for the overhead dome light and the reading drops to .088 but never any lower than that. Any ideas what is causing battery drain? Vehicle had brand new alternator and battery and has been load tested and passed.
Reply With Quote
Old 01-21-2015, 07:47 AM
CF Beginner
Join Date: Jan 2015
Posts: 1
Default S-10 Battery drain

I have this problem, I noticed that my clock never turns off and drains my battery. Seems to be a common issue with an internal radio problem pull the # 13 fuse.. this should eliminate the "always hot" circuit to the radio. charge your battery and if your battery remains charged then replace the radio
Reply With Quote
Old 01-21-2015, 07:47 AM

2000, 99, amps, battery, blazer, chevrolet, cold, cranking, drain, parasitic, problems, replacement, replacing, s10, ssr

Thread Tools

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 On
Trackbacks are On
Pingbacks are On
Refbacks are On

Join Chevroletforum
Featured Sponsors
Vendor Directory
Our Sponsors
All times are GMT -5. The time now is 01:33 AM.

Internet Brands, Inc.

Emails Backup