Notices
C3 Tech/Performance V8 Technical Info, Internal Engine, External Engine, Basic Tech and Maintenance for the C3 Corvette

1981 Battery DRAIN in 1 day

 
Old 06-08-2019, 08:27 AM
  #1  
clt1wjs
Junior Member
Thread Starter
 
Member Since: Jun 2019
Posts: 4
Likes: 0
Received 0 Likes on 0 Posts
Default 1981 Battery DRAIN in 1 day

I have a .32 amp draw on my battery with every fuse pulled and all relays disconnected. The computer is un plugged. It has a brand new fully charged battery @ 12.7 v and charges at 13.8 v. Brand new alternator (3rd one). I put new ground wire and new starter harness on and still cannot find where it is coming from. I have read every thread on here and tried everything that has been suggested. Where do I look next? Please advise!!!
clt1wjs is offline  
Old 06-08-2019, 08:42 AM
  #2  
Fredtoo
CF Senior Member
 
Member Since: Jun 2014
Posts: 268
Received 59 Likes on 49 Posts
Default

Have you tried unplugging the plastic 2 wire plug on the alternator?

I had a drain that stopped when I unplugged that.
It was resolved by replacing the ignition switch.
Fredtoo is offline  
Old 06-08-2019, 08:51 AM
  #3  
clt1wjs
Junior Member
Thread Starter
 
Member Since: Jun 2019
Posts: 4
Likes: 0
Received 0 Likes on 0 Posts
Default

Yes, It didn't change anything
clt1wjs is offline  
Old 06-08-2019, 10:51 AM
  #4  
henrikse
CF Senior Member
 
henrikse's Avatar
 
Member Since: Nov 2016
Location: Kelowna British Columbia
Posts: 591
Received 79 Likes on 76 Posts
Default

Do you have a wiring diagram? PM me with email I will send as too big for forum. Disconnect large red at starter (battery cable) and it should go away. You have a red and red/blk leaving the starter that may be the problem or your solenoid. If not with the schematic you at least have an idea what else to check . do you have a positive or negative ground which will tell you if it is on negative battery or positive. Positive is fused and negative can be tougher to find until you isolate circuit. 320 ma isn't huge so tells you that it is probably a light ground
henrikse is offline  
Old 06-08-2019, 01:10 PM
  #5  
Peterbuilt
CF Senior Member
 
Peterbuilt's Avatar
 
Member Since: Aug 2006
Location: mount holly NC
Posts: 5,486
Received 470 Likes on 428 Posts
Default Hi and welcome!

The 'starter extension harness' has a BLACK wire that should be connected to a starter or bell housing bolt, you didn't connect it to the battery terminal on the solenoid, did you?
Peterbuilt is offline  
Old 06-08-2019, 01:14 PM
  #6  
jhopper408
CF Senior Member
 
jhopper408's Avatar
 
Member Since: Apr 2013
Location: Port Hope MI
Posts: 982
Likes: 0
Received 22 Likes on 22 Posts
Default

Mine did the same thing. I never did find it. So I just put a on and off switch on the battery.
jhopper408 is offline  
Old 06-08-2019, 01:38 PM
  #7  
clt1wjs
Junior Member
Thread Starter
 
Member Since: Jun 2019
Posts: 4
Likes: 0
Received 0 Likes on 0 Posts
Default

After unplugging it and waiting the meter went down to .003 amps. I pulled the steering column and replaced the ignition switch. I plug the two wire back into the alternator and it went right back to .32 amps.
clt1wjs is offline  
Old 06-09-2019, 01:33 PM
  #8  
Goody
CF Senior Member
 
Goody's Avatar
 
Member Since: Oct 2000
Location: Oak Harbor WA
Posts: 6,264
Likes: 0
Received 13 Likes on 13 Posts
Default

If all fuses and relays have been removed from the fuse box and you are still getting a draw then something else is still connected to the battery that is shorted out creating the load (power draw). It can be a switch, sensor, or actuator on the circuit. You're going to need to review the wiring diagrams for your year vehicle and start tracing through them to see what items draw power directly from the battery or use a circuit outside of the fuse box in the cabin.
It is possible that something was added to the car later in life directly from the main power wire before the fuse box and it is shorted internally causing the draw. Like an amplifier for a stereo, security system, remote start or who knows what.
Use the DVM to start probing power wires through the car to see what is still drawing power. Visually check the car out for anything that is not factory installed or for wire bundles that have the loom repaired or peeled back. Removing the seats might make this easier to get under the dash for the visual inspection.
Goody is offline  
Old 06-09-2019, 02:10 PM
  #9  
henrikse
CF Senior Member
 
henrikse's Avatar
 
Member Since: Nov 2016
Location: Kelowna British Columbia
Posts: 591
Received 79 Likes on 76 Posts
Default

Originally Posted by clt1wjs View Post
After unplugging it and waiting the meter went down to .003 amps. I pulled the steering column and replaced the ignition switch. I plug the two wire back into the alternator and it went right back to .32 amps.
After unplugging what?
henrikse is offline  
Old 06-10-2019, 04:38 PM
  #10  
clt1wjs
Junior Member
Thread Starter
 
Member Since: Jun 2019
Posts: 4
Likes: 0
Received 0 Likes on 0 Posts
Default

Well I found the source! The Orange wire from the fuse box (ECM 10 amp) to the ECM is pulling exactly .32 amps. If I pull that fuse out it goes to zero. Any suggestions on how to fix? I pulled all the tape off and I see no breaks in the wire. The terminals look clean...… I also put a new ignition switch in and a new ECM.
clt1wjs is offline  
Old 06-11-2019, 08:27 AM
  #11  
nix1981
CF Senior Member
 
Member Since: Feb 2016
Location: Round Hill Virginia
Posts: 608
Received 34 Likes on 27 Posts
Default

I don't have my 81 anymore, but I had the gremlin! Turned out it was the door/interior light timer. It's an orange colored box that's located behind the glove box. I found a good one and that solved my electrical issues.
nix1981 is offline  
 


Thread Tools
Search this Thread
Quick Reply: 1981 Battery DRAIN in 1 day


Contact Us - About Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

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: