1999 SLS battery drain
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Cadillac Seville / Cadillac Eldorado Forum Discussion, 1999 SLS battery drain in Past Cadillac Vehicle Discussion; howdy my sls has a drain ,new battery, new alternator, grounds clean, lights off any ideas? thanks!!...
  1. #1
    wyattkenneth is offline Cadillac Owners Member
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    1999 SLS battery drain

    howdy my sls has a drain ,new battery, new alternator, grounds clean, lights off any ideas? thanks!!

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    Ranger's Avatar
    Ranger is online now Cadillac Owners Member
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    Re: 1999 sls battery drain



    Pull the negative battery cable and place a 12v test lamp in line between the cable and the battery terminal. A drain should illuminate the test lamp. Start pulling fuses until the lamp extinguishes. That will tell you what circuit or component to focus on.

  4. #3
    wyattkenneth is offline Cadillac Owners Member
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    Re: 1999 sls battery drain

    howdy thank you fer quick reply will do i have read an old reply about the bose amp to a guy in england i belive it was from you. thanks again have looked at this fourmfor years this was my first post, yall have help me many times in the past thank you very much have a great day

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    wyattkenneth is offline Cadillac Owners Member
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    Re: 1999 SLS battery drain

    howdy it ending up being the onstar / phone module in trunk passenger side disconnected it no more draw.

  6. #5
    oldstuff is offline Cadillac Owners Fanatic
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    Re: 1999 sls battery drain

    Just for information to anyone trying this method of finding the battery draw. I thought it made perfect sense so I tried it and I pulled every fuse and relay one at a time and the light stayed on. Then I pulled all the fuses and relays and the light was off so I started to insert them one at a time till the light came on. When it came on I pulled that one back out and continued replaceing them and the light came on with another one. Seems there were two circuits causing the draw and pulling one at a time didn't disconnect the draw.
    Dave

    Quote Originally Posted by Ranger View Post


    Pull the negative battery cable and place a 12v test lamp in line between the cable and the battery terminal. A drain should illuminate the test lamp. Start pulling fuses until the lamp extinguishes. That will tell you what circuit or component to focus on.

  7. #6
    Harry Yarnell is offline Cadillac Owners Fanatic
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    Re: 1999 SLS battery drain

    This Insertion of a test lamp has a flaw.
    A number of circuits stay 'active' for a short period of time after key off.
    I've replaced the test lamp with an amp meter and watched the current after the key was turned off. Couple amps for many minutes...and in wasn't all out at the same time.
    I forget what sleep mode draws; 20-30 ma.?

  8. #7
    oldstuff is offline Cadillac Owners Fanatic
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    Re: 1999 SLS battery drain

    Does that apply with the battery cable disconected? The only voltage entering the system is what comes through the fillament of the test light bulb so I would think the ability of the delay protocal would be nullified.

    Dave

    Quote Originally Posted by Harry Yarnell View Post
    This Insertion of a test lamp has a flaw.
    A number of circuits stay 'active' for a short period of time after key off.
    I've replaced the test lamp with an amp meter and watched the current after the key was turned off. Couple amps for many minutes...and in wasn't all out at the same time.
    I forget what sleep mode draws; 20-30 ma.?

  9. #8
    Submariner409's Avatar
    Submariner409 is offline If it won't run, chrome it
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    Re: 1999 SLS battery drain

    RAP drops several different modules over a 10 minute period. After that, residual current draw is usually 15 - 25 mA.

    Any operation of doors or equipment during RAP hold drastically changes current draw.

    There should be no vehicle voltage present if the battery is disconnected ???? Yes, some modules have onboard capacitors or a ?lithium cell?, but you should not be able to see than on the main bus.

    Depends on the test lamp bulb - all my Hickok vacuum tube testers use a 6 volt automotive single filament bulb as a fuse - and that bulb can pass quite a bit of current.

  10. #9
    Harry Yarnell is offline Cadillac Owners Fanatic
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    Re: 1999 SLS battery drain

    A
    Ah yes, Hickock tube testers. Remember those back in the day when I was doing tv service.

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