Member Since: 06 Oct 2013
Location: 40789 Monheim am Rhein
Posts: 4
Electronic Problems / Fuse 20 constantly blowing up
First of all, sorry for my English,
I´m slowly getting mad on my MY05 HSE.
The Problem appeared a few weeks ago, low voltage warning Light showed up, central locking didn´t work.
Alternator and Battery changed, everything OK.
some weeks later, after a car wash, the alternator Warning appeared again and central locking didn´t work while locking with the Key.
I disconnected the Battery, ordered another Alternator, this time original, Denso, fitted it and changed Fuse 20, wich was blown.
For two weeks everything seemed alright until Yesterday. After driving home from work, the Alternator Light showed up again.
While changing Fuse 20, I noticed that there is still Voltage, even the Car was in "sleep" Mode. New 5A Fuse blew while putting it in
Now i checked the Electrical wiring diagram and there is a wire from the Starter motor to the Alternator shown.
Is it in any way possible, that my Issue isn´t the Alternator but the Starter motor?
8th Oct 2018 7:02 pm
M3DPO
Member Since: 22 Sep 2010
Location: Notts.
Posts: 8069
Check the cable from the alternator is not rubbing and shorting.It can when others can't,
It will when others won't,
It goes where others don't.
8th Oct 2018 7:47 pm
Pete K
Member Since: 15 Jan 2016
Location: GL
Posts: 10360
Is the fuse you talk of labelled ALT ?
Check the front floor/carpet isn't wet inside.
Do you have a sunroof?
8th Oct 2018 8:02 pm
terho
Member Since: 06 Oct 2013
Location: 40789 Monheim am Rhein
Posts: 4
Yep, it s to ohne labeled ALT
Floormat and CJB and Fusebox in the Enginecompartment are dry
Sunroof is installed but out of order
8th Oct 2018 9:19 pm
Pete K
Member Since: 15 Jan 2016
Location: GL
Posts: 10360
Central locking doesn’t work when key used in left door.
Follow the thin wires by alternator and see
If they are ok condition or bare.
Unplug connector from alternator.
Replace fuse
And see if fuse remains good
9th Oct 2018 10:03 pm
Globetrotter448
Member Since: 21 Mar 2017
Location: Londonderry NSW
Posts: 1780
There was a problem with the battery lead to the starter/alternator rubbing through on the front diff giving similar problems and occasionally shorting
10th Oct 2018 7:19 am
M3DPO
Member Since: 22 Sep 2010
Location: Notts.
Posts: 8069
It can when others can't,
It will when others won't,
It goes where others don't.
10th Oct 2018 8:29 am
terho
Member Since: 06 Oct 2013
Location: 40789 Monheim am Rhein
Posts: 4
Thanks to everybody,
I ordernd a new Denso Starter Motor, because the Car needed the last Weeks länger Time to Fire Update, Weile changing the Starter i will Check all Cabels i can reach
Holger
10th Oct 2018 9:13 am
Pete K
Member Since: 15 Jan 2016
Location: GL
Posts: 10360
Globetrotter448 wrote:
There was a problem with the battery lead to the starter/alternator rubbing through on the front diff giving similar problems and occasionally shorting
that causes the ~250A MEGGA fuse on the battery + post to blow.
Not the tiny 5A one
10th Oct 2018 12:16 pm
Martin Site Admin and Owner
Member Since: 06 Nov 2004
Location: Hook Norton
Posts: 18445
Click image to enlarge
The fuse is permanently powered, so that is OK.
Only two connections - one to the transit relay connector, one to the alternator.
Check for broken/damaged wire at the transit relay connector and near the alternator.
Unplug the alternator connector - does a new fuse still blow?
The starter motor wiring is unrelated, this is the high current cable back to the battery from the alternator which is passed through the starter on a TDV6.06 D3 SE / 15 LR D90 XS SW / 88 LR 90 Td5 / 68 BMW 2000 ti
Any issues with the site let me know!
10th Oct 2018 12:47 pm
Pete K
Member Since: 15 Jan 2016
Location: GL
Posts: 10360
good spot Martin
10th Oct 2018 8:52 pm
terho
Member Since: 06 Oct 2013
Location: 40789 Monheim am Rhein
Posts: 4
Finaly got. the Time to search the issue. The previous Owner seemd to used the line for an additional 12V supply. The Wire dissapeares somewhere behind the CJB. Disconnected this wire and resoldered the original cabels. Alternator PWM Signal works again.
BUT the Key doesn‘t work. Locking, Unlocking or LR Button don‘t work. Starting the Car is no Problem.
Ans hints?
Holgern
You cannot post new topics in this forum You cannot reply to topics in this forum You cannot edit your posts in this forum You cannot delete your posts in this forum You cannot vote in polls in this forum
