Quiescent current with 80mA ok or too high? Fuse #20 (fog light) alone already accounts for 65mA

  • Hi all,

    since a few days ago my battery was surprisingly dead (2V), I charged it and then measured the quiescent current: about 80mA, it always jumps between 76mA and 84mA. Then I pulled all fuses one after the other and at #20 the quiescent current suddenly dropped significantly, to about only 15mA. According to the plan, #20 is responsible for rear fog light and fog light switch. But why should a current of 65mA flow here in standstill?

    Many greetings, Daniel

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    Viele Grüße, Daniel (der schon mal für einige Jahre im PFF war und nun einen neuen Account hat)

  • approx. 80mA, it always jumps between 76mA and 84m

    Factor 10 too high! In modern cars, this is probably still acceptable, in an old 911 G in any case! In a G I would consider more than 5-6mA as too much, but unfortunately have no own measured values at hand.

    But why should a current of 65mA flow here at standstill?

    Either an unknown consumer or a technical/electrical error.

    I would therefore start by measuring this circuit (rear fog light and switch) or follow the lines to see if there are any branches that may not belong there.

    Maybe just an impermissible contact resistance/creepage current? The car has a rear fog light? It always hangs back there in dirt and water and gets the engine heat...

    Maybe there are experience values of other owners?

    Greetings, Thomas

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    81er ex-US 911 SC Coupé, platinmet., eSSD, K-Leder sw., Turboheckflügel & -frontspoiler, NSW, Maxilite 7/8J, Bilstein Fw("SpoStra" - noch...), 915/61, 930/16 o.Kat, WebCam 20/21 NW, hydr.KS, Dansk 92.502SD, 123 Ignition, orig. Porsche SWV, Seine Systems Gate Shift Kit, Momo Prototipo m.Nabenerhöhung


    „Nicht das Auto verdirbt den Charakter, aber wer keinen Charakter hat, sollte nicht Auto fahren.“

    Ferdinand Porsche

  • Hello

    17-25mA

    All original 89 er G

    Orig warning system off, so not shut off.

    Values are i.O. For me. Everything under 30mA in the oldie with old radio and Blaupunkt booster from factory etc fits.

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    911 Cabrio 930/25 , 3-1989, San Diego Reimport 2020 (38000mls, ab jetzt wird´s mehr !)

  • Many 964 drivers would be happy about so little quiescent current......

    2V ???

    Oha -- the battery did not survive that without "internal injuries".

    Don't be surprised if the battery is now even more quickly flat.

    As Schulisco already wrote -- consumption must be 0,0x Ampere.

    Various 1/100th A -- nix tenths!

    Lars -- theDisconnectorType

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    Nur wenn du schwarze Striche vom Kurvenausgang bis zum nächsten Bremspunkt ziehen kannst, hast du wirklich genug Leistung(Mark Donohue).

    Im Alter wird man immer knackiger -- da knackt es und da knackt es...

    Sechs 964er bisher mit abgerissenen Dilas --- 14(!!!) Ventilfederbrüche bei den letzten 5 Motoren! 4:3:3:1:3

    Porsche 911 -- der Volkssportwagen...

    "Hoffnung -- ist immer ein Mangel an Information!"

    Wer restauriert -- verliert...

  • Then I think you mean 0,00x?

    0,0x I would fulfill with my 80mA (=0,08A)

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    Viele Grüße, Daniel (der schon mal für einige Jahre im PFF war und nun einen neuen Account hat)

  • ... 80mA is a lot I think ... often new radios and radio remote control are the culprits or comfort aids the guzzlers.

    8mA are unrealistic in the G with radio and alarm system ... where the factory system in the G is extremely economical. But whether 8 or 20 doesn't matter in real life, as my 2015 USA battery discharges faster on its own!!!

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    911 Cabrio 930/25 , 3-1989, San Diego Reimport 2020 (38000mls, ab jetzt wird´s mehr !)

  • Lars -- theDisconnectorType

    :thumbup-alternative:

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    Alles über den 3.0 US SC Motor 930.16 und viel mehr unter:

    https://nineelevenheaven.wordpress.com/


    - 911 SC 3.0, USA Bj 82, unischwarz, SSIs, eigens entwickelte digitale Lambdaregelung sowie elektronische Kennfeld-gesteuerte Zündung
    - VW Oval-Käfer Export, Bj 1955, 30PS, Stratosilber
    - VW Brezel-Käfer, Bj 1950, 24,5 PS, Grau, orig. Philips Elomar Radio

  • Hello

    17-25mA

    All original 89 er G

    Orig warning system off, so not shut off.

    Values are i.O. For me. Everything under 30mA in the oldie with old radio and Blaupunkt Booster ex factory etc fits.

    About 20 mA quiescent current had my 89 G also. 40 mA or more would have been considered unacceptable by me.

    Greetings

    Dianos

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    911 C1 Targa, Mj. 89

    911 SC Targa, Mj. 81

    911 2,7 Targa, Mj. 77

    Edited once, last by Dianos (September 27, 2023 at 12:49 AM).

  • According to this meter, the battery is doing great, 100% SOH and a decent internal resistance.

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    Viele Grüße, Daniel (der schon mal für einige Jahre im PFF war und nun einen neuen Account hat)

  • My practical experience is different...

    If the battery -- in my eyes for a different reason than the Miliampere***** -- was once deep discharged to 2V.

    Then from now on it is flat again in no time even with 0.09A.

    One must see like an infarct at the pump -- afterwards evenly that pump has never more the conveying capacity......

    Who does not use now here a disconnector consistently always -- much fun.....

    *****:

    Can actually only be, which was additionally still a consumer on -- possibly trunk light, because the hood was not properly closed?????

    Lars

    This post has been automatically translated.

    Nur wenn du schwarze Striche vom Kurvenausgang bis zum nächsten Bremspunkt ziehen kannst, hast du wirklich genug Leistung(Mark Donohue).

    Im Alter wird man immer knackiger -- da knackt es und da knackt es...

    Sechs 964er bisher mit abgerissenen Dilas --- 14(!!!) Ventilfederbrüche bei den letzten 5 Motoren! 4:3:3:1:3

    Porsche 911 -- der Volkssportwagen...

    "Hoffnung -- ist immer ein Mangel an Information!"

    Wer restauriert -- verliert...