ls swap parasitic battery drain - Third Generation F-Body Message Boards


Electronics Need help wiring something up? Thinking of adding an electrical component to your car? Need help troubleshooting that wiring glitch?

ls swap parasitic battery drain

Reply
 
Thread Tools Search this Thread
Old 05-15-2018, 10:02 PM   #1  
Junior Member
Thread Starter
 
Join Date: Aug 2004
Posts: 19


ls swap parasitic battery drain

I may be making this into a larger issue than it is but it seems like if i leave my car sitting for 2 weeks or so the battery is very noticeably drained. I realize leaving it sit for that long its bound to happen but i don't ever remember it being quite that fast. I've got an 84 firebird that I've swapped an ls3 into. Everything seems to be working fine. I ran through the procedure to track down parasitic loss. I came up with 34 mA. I think anything under 100 is not supposed to be too bad, but the fuses i found the draw on aren't what i expected.

7mA from Courtesy fuse
2mA from stop/hazard fuse
24 mA from fuse 11 in the GMPP LS fuse block labeled Bulkhead cont. Power

The meter always reads 34 mA to start with then very slowly starts going down about .1 mA every few seconds. I left it connected for a few minutes but it only went down a little past 33 mA, the decrease seems to be on the new fuse box side.

looking at the wiring diagrams seems like the stop/hazzard is probably the radio. And all i can tell on fuse 11 is that in the LS swap guide its also called Cigar accessory and ties into the Data Connector. Doesn't seem like anything except the radio should draw power. I could understand if it was the ECM fuse but I've no clue what might be sucking the power.

I don't think that my cigarette lighter even works in my vehicle so other than it and the dome light i don't know what is on the courtesy fuse. I had previously had issues with the driver side door switch not functioning till i sprayed electronics spray into it and pulled and twisted on it some to hopefully clean the connections. It works now and doesn't seem like its an issue

Anyone have any ideas what i could try checking at the source or unplugging?
lightsaber2003 is offline   Reply With Quote
Old 05-15-2018, 11:38 PM   #2  
Supreme Member
iTrader: (14)
 
QwkTrip's Avatar
 
Join Date: Mar 2001
Location: Illinois, USA
Posts: 4,662
Car: '89 Firebird
Engine: VIN says 2.8L
Transmission: T56
Axle/Gears: 3.73


Re: ls swap parasitic battery drain

34mA isn't bad at all.

The courtesy fuse is hot at all times and is for interior lighting.
cigar lighter
glove box light
dome light and floor lights (grounded by door jam switches)
dome light and floor lights (operated by dash light switch)
cargo compartment light
There might be something else on that circuit.
QwkTrip is offline   Reply With Quote
Old 05-16-2018, 05:39 AM   #3  
Supreme Member
iTrader: (1)
 
Join Date: Sep 2005
Posts: 20,369
Car: Yes
Engine: Usually
Transmission: Sometimes
Axle/Gears: Behind me somewhere


Re: ls swap parasitic battery drain

The radio isn't on the stop/hazard circuit. It IS however on the "courtesy light" circuit: that's its source of constant battery that holds up the clock and the pushbutton memory. It MAY ALSO be the source for anything aftermarket that's been installed; amplifiers, alarms, remote starts, etc.

I doubt messing with the door switch would change anything in regard to a "parasitic drain". Any dirt or other schmutz on it isn't likely to conduct enough current to be significant. Not saying that you shouldn't have done that, or that your contacts were fine, or ANYTHING like that; only, that doing that, is vanishingly unlikely to have had any impact on the matter at hand. Likewise, the cig lighter itself would have to have some pretty groaty funk built up on it, which would probably be staying warm enough to smell 100% of the time, if it could conduct current constantly. Also not likely to be a factor here.

24 mA on the batt line to the ECM sounds pretty much in line with normal reality. I suspect that just about any modern car won't last more than a few weeks of sitting without draining the batt.

I'd suggest one of those solar "battery tenders" like they sell for boats... doesn't take much juice obviously, doesn't have to be a real hoss or anything. If you put one on it that can deliver 100 mA, that would be enough to supply the "drain", as well as the battery's own natural internal "drain", during the 50%ish of the time that there's sunlight to work it.
sofakingdom is offline   Reply With Quote
Old 05-16-2018, 06:18 PM   #4  
Junior Member
Thread Starter
 
Join Date: Aug 2004
Posts: 19


Re: ls swap parasitic battery drain

I'd be inclined to agree on the ECM the only issue i have with that is there are 2 fuse 1 labeled for the ECM and another for ECM keep alive but neither of those are the ones drawing the power. I have an after market radio but its just a cheap replacement unit no extra amps. I think the wiring was spliced in for that but it wasn't something I did so i don't know if the pulled power from somewhere strange. The wiring diagram i saw showed the radio alarm running off the stop/hazard so that's why i figured that was the radio. Its possible that they both are in one way or another or that it didn't have a factory alarm so that circuit should be dead. I was going to attempt to unplug the controller for the transmission and see if that is what is pulling the 24 mA otherwise i'm left with taking the fuse out and seeing if any trouble codes pop up or if i notice anything without power.

Probably not worth tearing the car apart to figure out.
lightsaber2003 is offline   Reply With Quote
Old 05-17-2018, 11:44 PM   #5  
Junior Member
Thread Starter
 
Join Date: Aug 2004
Posts: 19


Re: ls swap parasitic battery drain

I found the root of the 24mA draw. It is the Transmission control module. Can't really do anything about it and not sure why it doesn't have an efficient sleep mode like the ECM. I'm assuming the rest is the radio.

If i can figure it out i may look into switching the fuse to a circuit from a switched source.
lightsaber2003 is offline   Reply With Quote
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
How to Find a Parasitic Battery Drain ProStreetDriver Tech / General Engine 0 10-16-2017 12:29 AM
Parasitic Battery Drain & Bogging at 1200rpm lksfast77 Electronics 0 05-25-2015 03:49 PM
Parasitic Drain?? Mightymatt Electronics 2 08-18-2009 09:16 AM
Urgent...How do you find a parasitic drain? 84IROCz28 Electronics 1 08-09-2001 10:15 AM
bad battery or parasitic drain? scoob8000 Electronics 1 11-15-2000 05:31 PM


Go Back   Third Generation F-Body Message Boards >

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


Advertising
Featured Sponsors
Vendor Directory

1982 Camaro '82 || 1983 Camaro '83 || 1984 Camaro '84 || 1985 Camaro '85 || 1986 Camaro '86 || 1987 Camaro '87 || 1988 Camaro '88 || 1989 Camaro '89 || 1990 Camaro '90 || 1991 Camaro '91 || 1992 Camaro '92


All times are GMT -5. The time now is 11:58 PM.


All content copyright 1997 - 2018 ThirdGen.org. All rights reserved. No part of this website may be reproduced without the expressed, documented, and written consent of ThirdGen.org's Administrators.
We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
 
  • Ask a Question
    Get answers from community experts
Question Title:
Description:
Your question will be posted in: