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#1
3rd February 2017, 05:08 PM
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Battery drain.
I picked up a battery drain issue over Christmas which I managed to locate to a 20amp fuse in boot using my multimeter.
I've been disconnecting this for the past few weeks and no more flat battery. This is the fuse which The stereo runs off. Do you know if anything else is in this circuit relies on this fuse? If it's only the stereo then I will go back to the audio shop. If there are other appliances running off this do you know where I can get a wiring diagram from? Cheers Rich
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2002 S8 - Irish Green Pearl. Cat N (saved by the D2 Doctor  )1988 E30 Coupe - Royalblau Metallic 2003 S4 Avant - Light Silver Mettalic 2016 S5 Coupe Black Edition - Ibis White 
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#2
3rd February 2017, 05:20 PM
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Have a look at this, same issue but no definitive solution. http://forum.a8parts.co.uk/showthrea...LDNICK+BATTERY
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Currently 8less 2011 Q7 S Line 3.0TDI, 2016 Tesla Model S 90D 8 history: 2006 A8 Sport 4.2TDI quattro SOLD, 1997 S8, reached end of life with gearbox failure
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#3
3rd February 2017, 07:41 PM
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That fuse goes directly to the Bose amp on the other side, then it also feeds the antenna module in the passenger-side and then, iirc on to the head unit. There is nothing other than audio systems on it.
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#4
4th February 2017, 10:57 AM
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Thanks guys. I suspect my aftermarket stereo is the culprit then.
Everything about these cars is bugging lately because it's not straight forward. Off to buy a Honda Civic......
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2002 S8 - Irish Green Pearl. Cat N (saved by the D2 Doctor )1988 E30 Coupe - Royalblau Metallic 2003 S4 Avant - Light Silver Mettalic 2016 S5 Coupe Black Edition - Ibis White
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#5
4th February 2017, 11:05 AM
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Do you have an aftermarket stereo driving a Bose system?
IIRC there's a wake/sleep signal that the Bose amp receives from the OEM RNS head unit. If that's not being sent correctly your amp may be permanently "live".
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2003 D2 FL S8. Irish Green Pearl/Beige. Solar sunroof, auto-dim mirrors, electric rear seat functions, ski hatch retrofit; extended leather. Aftermarket DVB-T, reversing camera and full XCarlink (Bluetooth etc.). 2016 Volvo V40 T5 Cross Country (4WD) with ALL the toys including adaptive cruise etc. etc. Osmium Grey with Blonde/Charcoal leather interior. Polestar performance "optimisation".  (A much rarer model than a D2 S8 by the way!) Oh, and a brand new engine at just under 30,000 miles on the factory one!  Finally: gone, but not forgotten..... 1998 D2 PF S8. AgateGrey/Platinum. Every option (I think) except electric rear seats, tiptronic steering wheel, ski hatch, towbar & dimming door mirrors. e.g. Cruise control, NavPlus/TV, Bose, GSM, Xenons, Solar roof, Parking sensors, Alcantara/leather everywhere of course.  (internal dimming mirror added later)1998 (very early) Ford Focus 1.8 Zetec; ABS/TCS, Heated screen/mirrors, Aircon, Auto-dim mirror, Leather, Trip computer, Cruise control, OEM Ford SatNav with CD changer. And before that a lot of Rover 800s, a few oddities, a lovely Triumph Dolomite 1850HL with Overdrive and way back in my schooldays an Austin Seven aka Mini 850! 
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#6
4th February 2017, 04:04 PM
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to pick up where I left off in the other thread , having removed the alarm but left the 20 amp fuse in have been ok starting the car so left well alone
but now being in england with consequent low temperatures again struggling I have decided to start again ....in case previous problems have damagedthe battery have decided to fit a new one and start again.......hankook 60038 4 year guarantee arriving monday ps can anyone with a working alarm confirm that it works on the 20amp fuse referred to ? it is certainly where my drain occurs ,disconnecting the CD stack , radio or aerial makes no difference Last edited by oldnick; 4th February 2017 at 04:12 PM.
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#7
4th February 2017, 07:20 PM
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The alarm is not connected to the 20A Bose fuse - I've stripped that wiring out of mine completely. If memory serves, there is another one in the same location though. Maybe that's the drain rather than the audio one?
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#8
5th February 2017, 07:12 AM
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Quote:
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 Daily drive: 2016 Infiniti QX70.....a car that's even more complicated than my last Infiniti FX to modify  Current 'Project': VW Crafter CR50 4 berth camper van Previous 'Projects': 2006 Subaru Legacy Spec 'B' 3.0R, 1994 Ex-MOD Land Rover Defender, now "civilianised". 2000 Audi S8 FL www.whall.co.uk
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#9
5th February 2017, 12:13 PM
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Quote:
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Mark ------------------------------------------------------ 2002 FE S8 Ebony Black Pearl ------------------------------------------------------  ------------------------------------------------------ Cars Owned: The Tesla Era: 2020 Model S Performance Ludicrous+ (present) (Black, with all black premium interior and carbon fibre décor, 21" sonic carbon twin turbine wheels and FSD capability) The Audi Era: '97 A8 4.2 (Ming Blue) --> '96 A8 4.2 QS (Dark Green) --> '02 FE S8 (present) The Citroen Era: '84 BX 1.6 RS --> '89 BX 1.9 DTR Turbo --> '94 XM 2.0L Turbo --> '96 XM 2.0L Turbo Exclusive --> '00 Xantia Activa 2.0L Turbo The Banger Era: '76 1.2L Lada VAZ-2101 (Ruski Fiat 124) --> '80 1.7L Morris Ital HL, finished in Ermine White and Rust
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#10
5th February 2017, 02:53 PM
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