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Thread: MRK 5 Golf TDI Battery Keeps Draining

  1. #1
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    MRK 5 Golf TDI Battery Keeps Draining

    My Mrk 5 Golf TDI keeps and has been draining/not starting spontaneously and continuously over the past 6 months, Iíve been through 2 new alternators, 3 new batteryís (currently on the 3rd one now and itís definitely depleted as Itís been drained and recharged about 3/4 times)
    Iíve been to a electronics radio specialist too look at the custom radio that I have had fitted (by Halfords 18 months ago, and for the first year of having the new radio it was fine, then the problems started in the last 6 months)
    The specialists did a battery drain test and itís showed a normal amount of 0.02 milli amps drawing from when itís idle (completely normal I know) checked the amp levels and the voltage levels on the battery when the car is running and all CPUís and systems are running showing normal levels at 14.7
    All the wiring to my custom radio is fine itís correct the radio isnít drawing any power, there arenít any boot lights or glove box lights on when idle.
    I have literally checked and it has been checked for everything possible i/we can think off, 3 mechanics and the AA and Auto electrical engineer has looked at it, everyone has said itís fine.
    I have been recommended to get a new/better battery (not from Halfords, even though I spent £100 on a higher range battery from them) but I donít want to get a brand new super duper battery for it just to be depleted gradually again and be back to square 1
    PLEASE HELP ME, IM DESPERATE

  2. #2
    Administrator Keithuk's Avatar
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    First posts normally go in introductions else you could get a free fix and we never see you again!!!

    You car spec says 0, only what I've added from this post Mk5 Golf TDI?

    Battery drain is a common problem you can Google CAN Bus. This has been talked about many times on here is you search.

    Post moved to the correct section as OP can't read sub forum titles.
    2010 Golf GTD (170) CBBB, 5 Door, Shadow Blue (P6/D5Q), Transmission Code: KXZ, Flat Tyre Indicator, Basic Protection Pack + VCDS.


  3. #3
    Administrator Crasher's Avatar
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    What year is your car?
    2003 Skoda Octavia VRS Estate. APR 98RON remap, APR R1 diverter valve, Jetex exhaust, K&N panel filter, 7.5x18 Alutec Monstr wheels with 225/40 18 Uniroyal Rainsport 3 tyres.
    2006 Polo GTI 1.8T, APR 95RON remap
    1988 Golf 2 GTI 16 valve, 2.2 with Weber Alpha injection
    1983 Golf 1 GTI 8 valve, 2 litre with Eurospec racing 42/36 head
    1972 1302LS auto 1641cc conversion

    Vile Invention

    Dark was that day when Diesel conceived his grim engine that begot you, vile invention, more vicious, more criminal than the camera even, metallic monstrosity, bale and bane of our culture, chief woe of our Commonweal. How dare the Law prohibit hashish and heroin yet license your use, who inflate all weak inferior egos? Their addicts only do harm to their own lives: you poison the lungs of the innocent, your din dithers the peaceful, and on choked roads hundreds must daily die by chance-medley. Nimble technicians, surely you should hang your heads in shame. Your wit works mighty wonders, has landed men on the Moon, replaced brains by computers, and can smithy a "smart" bomb. It is a crying scandal that you cannot take the time or be bothered to build us, what sanity knows we need, an odorless and noiseless staid little electric brougham.

    W.H. Auden (1907-1973), A Curse:

  4. #4
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    Hi George54, is there anything (and i mean anything, plugged into your cigar/cigarette/aux sockets ?) They are constantly powered even with the ignition switched off and anything plugged in to them will drain the battery.
    2005 Golf 2.0 TDI-PD

  5. #5
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    Hi, me again, i would also check if your custom radio was 3rd party 'piggy-backed' off a constant live feed from your fuse box. I take it your issues kinda started when you had your stereo fitted (although would have taken a while to drain the battery and present themselves). Just a thought.
    2005 Golf 2.0 TDI-PD

  6. #6
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    As a tempoaray work-around you could install a battery isolation switch which would enable you to use the car without the battery draining overnight.
    To fault find, an amp meter will need to be in series then each circuit (fuse) should be removed methodically which should highlight which circuit is causing the drain and from there you can continue investigating that circuit.
    Here's one I produced earlier!
    https://www.wikihow.com/Find-a-Parasitic-Battery-Drain
    2007 Golf 1.9 TDi (BXE)

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