1990 Ford Mustang Battery drain

Tiny
STANGSRSWEET
  • MEMBER
  • 1990 FORD MUSTANG
  • V8
  • 2WD
  • MANUAL
  • 170,000 MILES
What could be daaining the battery after sitting for 2 days on a new battery, I checked for any power pulls and disconnected the fuse that was causing the drain, which was the dome light and radio fuse, the 12 volt light showed no light after I pulled the fuse, but it still has a drain, could it be bad cables maybe?
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Thursday, February 28th, 2008 AT 4:39 PM

13 Replies

Tiny
STANGSRSWEET
  • MEMBER
Also unhooked the battery and put a volt meter to the cables and showed a draw of.03 volts if that helps. Please
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Friday, February 29th, 2008 AT 6:58 PM
Tiny
MASTERTECHTIM
  • MEMBER
Keep the dome fuse out and with the neg cable disconnected put the meter on dc amps 10 or 15 and run it in series from the cable to the battery and tell me how many amps it is drawing.
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Friday, February 29th, 2008 AT 7:05 PM
Tiny
STANGSRSWEET
  • MEMBER
.12 from neg cable to pos terminal
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Friday, February 29th, 2008 AT 7:27 PM
Tiny
MASTERTECHTIM
  • MEMBER
With the neg cable disconnected, connect one end of amp meter to neg cable and the other lead to the neg side of battery with the positive cable still attached. Get back to me
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Friday, February 29th, 2008 AT 7:48 PM
Tiny
STANGSRSWEET
  • MEMBER
11.56 neg cable to neg terminal, the battery is below 12 volts and reading 11.71 now
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Friday, February 29th, 2008 AT 7:49 PM
Tiny
MASTERTECHTIM
  • MEMBER
Do you have a amp meter? Usually you have to put the meter on amps then you have to rearrange the leads on the meter. The neg stays the same but the positive lead goes into a spot on the meter just for amps, have you tried that and still get 11.56amps?
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Friday, February 29th, 2008 AT 7:53 PM
Tiny
STANGSRSWEET
  • MEMBER
Its a cheap meter it will read ac amps, maybe I should go buy a better meter
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Friday, February 29th, 2008 AT 7:56 PM
Tiny
MASTERTECHTIM
  • MEMBER
Yes you need to know. You can buy a cheap meter that does dc amps. Make sure it will do atleast 10 amps. Also when testing any kind of electrical problem you need to start with a fully charged battery, if not it will give us false readings. Also with your volt meter, reconnect the battery and start the car(if the battery is charged)and check volts at the battery, you should have around 14v at battery when running or we could have a bad alternator. Ill be watching this post so keep us posted.
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Friday, February 29th, 2008 AT 8:01 PM
Tiny
STANGSRSWEET
  • MEMBER
Did that and it read 14 volt range, so I figured it wasnt the alt. My main problem is when it sits for 2 the battery drains, now when I drive it every day it stays charged, right now it wont start with out a jump it willl crank for a second and start clicking.
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Friday, February 29th, 2008 AT 8:05 PM
Tiny
STANGSRSWEET
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And thank you for the help, I will go out tomorrow and get a meter. Thanks again
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Friday, February 29th, 2008 AT 8:18 PM
Tiny
STANGSRSWEET
  • MEMBER
.13 amps, sorry for the delay worked 12's t his weekend.
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Tuesday, March 4th, 2008 AT 5:01 PM
Tiny
MASTERTECHTIM
  • MEMBER
That tells us that there is not enough of a draw on the system to be causing our problem. Anything under.33amps is ok. Back to the original problem. Yes I think your original thought of bad cables is going to be your problem. That is the only logical answer. I just had one this afternoon on a ranger pick up and it had the same symptoms and it was the neg battery cable end. I replaced the end at the battery and all is well. Hope this helps
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Tuesday, March 4th, 2008 AT 5:09 PM
Tiny
JOEY@NSCN.COM
  • MEMBER
I have a 1990 GT and I have close to the same problem. I replaced my alternator and my battery but for some reason I dont have that much power to my car to run lights radio etc.
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Tuesday, January 13th, 2009 AT 10:57 AM

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