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94 945T battery drain 900

posted by  rjk2 on  Wed May 28 00:50 CST 2014
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last visit: Sat Jun 21 05:30 CST 2014
[RELATED]

Odd battery drain situation.
Not sure if everything is related but will mention all I remember.
I mistakenly left the ign key in the KI position overnight after I had put up the windows with an approaching T-storm.
The next morning, the battery was dead.
I recharged it after kicking myself.
Stopped at a gas station and noticed the headlights were on even though the key was OFF (I run the car with headlights ON most of the time).
Car restarted and I went to work after turning the headlight OFF.
Checked as I left the car and the headlights were OFF.
3-4 hours later, I went to go to lunch and the battery was dead again.
Could it be the ign switch?
Haven't had a chance to check the current drain yet but expect it will show abnormal drain with key in the OFF position.
I remember reading something on the board awhile back about an ign switch problem related to the 940.
--
1999 E320-200K 1994 F150 (awaiting a new engine) 1989 560 SL-180K 1994 945T-325K 1986 242Ti (awaiting a B230FT transplant) 1968 GT500KR (under slow restoration) 2007 HD Nightster (son's ride)








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    94 945T battery drain 900

    posted by  rjk2 on  Tue Jun 3 22:29 CST 2014
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    last visit: Sat Jun 21 05:30 CST 2014
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    Found the problem. Stuck headlight relay.
    --
    1999 E320-200K 1994 F150 (awaiting a new engine) 1989 560 SL-180K 1994 945T (daughter's)-312K 1986 242Ti (awaiting a B230FT transplant) 1968 GT500KR (under slow restoration) 2007 HD Nightster (son's ride)








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    94 945T battery drain 900

    posted by  Steve on  Wed May 28 06:08 CST 2014
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    last visit: Fri Oct 24 07:16 CST 2014
    [RELATED]

    Could indeed be the switch, an easy repair per the FAQ. There is no problem with these switches per se, but they wear and fail if your key ring is heavy, a similar problem as GM is now experiencing albeit without the same catastrophic results.








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      94 945T battery drain 900

      posted by  rjk2 on  Wed May 28 17:28 CST 2014
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      last visit: Sat Jun 21 05:30 CST 2014
      [RELATED]

      Checked the current draw and it was a steady .02A.
      Anyone know what the standard, key off draw is for this car?
      .02A seems high to me but doesn't seem like enough to draw down a battery completely in under 4 hours.
      Is all there is to draw the clock?
      .02A seems high for a clock.
      Nothing plugged in to any power ports.
      No dome lights on.
      Curiously. sometimes when I make contact, the draw will register as much as .28A and quickly drop to .02A and then remain constant.
      Indicates to me something isn't kosher in Denmark.
      I'll have time to mess around with the switch tomorrow but worry it may be a relay.
      I'll fool with them first to see if there is any difference in the readings.
      --
      1999 E320-200K 1994 F150 (awaiting a new engine) 1989 560 SL-180K 1994 945T (daughter's)-312K 1986 242Ti (awaiting a B230FT transplant) 1968 GT500KR (under slow restoration) 2007 HD Nightster (son's ride)







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