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DISCO3.CO.UK > Technical (D3)

Alternator Failure

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D3lta

Member Since: 13 Jun 2017
Location: Fylde Coast
Posts: 44

2006 Discovery 3 TDV6 HSE Auto Zermatt Silver

Alternator Failure

Had a nasty failure of the alternator (all dashboard warning lights) and car drained entire battery in about 30 seconds.

Got it to the garage on the back of a recovery truck and I'm looking to get it replaced under my warranty. Warranty company want a picture of the garage's fault scanner showing the P0622 fault. Trouble is that the car isn't showing any faults.
Would this be normal after a full battery drain (even with a new battery/booster pack put on to give the car at least some juice)?

Is it down the the scanner the garage is using?

Any suggestions at all? I don't fancy dropping £500 the week before Christmas). 2006 Discovery 3 - HSE Auto

18th Dec 2018 10:42 am

Globetrotter448

Member Since: 21 Mar 2017
Location: Londonderry NSW
Posts: 1783

2007 Discovery 3 4.0 V6 Petrol SE Auto Java Black

Problem would be that the shorted alternator created the same as a general clear (touch positive and negative together) and so all fault codes would be cleared

check that the cable from the positive of battery is not shorted to diff housing.

18th Dec 2018 11:06 am

D3lta

Member Since: 13 Jun 2017
Location: Fylde Coast
Posts: 44

Warranty company are saying that as soon as a new battery is put on it should pop the error code again but the car isn't doing it apparently. It has the battery light on the dash though so it know's something is up. 2006 Discovery 3 - HSE Auto

18th Dec 2018 1:06 pm

Pete K

Member Since: 15 Jan 2016
Location: GL
Posts: 10374

2005 Discovery 3 TDV6 HSE Auto Rimini Red

How about a picture of the dash with the battery light on ?
and revcounter at idle.

Disconnect alternator if necessary! to be safe

Last edited by Pete K on 18th Dec 2018 1:09 pm. Edited 1 time in total

18th Dec 2018 1:08 pm

Gareth
Site Moderator

Member Since: 07 Dec 2004
Location: Bramhall
Posts: 26705

If the cable is shorted (happened a few times) then the new battery will die also.

18th Dec 2018 1:08 pm

D3lta

Member Since: 13 Jun 2017
Location: Fylde Coast
Posts: 44

It's had a whine (RPM based) for a little bit. Had one of the tensioners/guide rollers replaced but still maintained the whine. Alternator is full of mud as well according to the garage which all suggests it's that.

I'll get them to check for shorts in the wiring though - other than the diff housing, is there a usual location for this? 2006 Discovery 3 - HSE Auto

18th Dec 2018 3:16 pm

Gareth
Site Moderator

Member Since: 07 Dec 2004
Location: Bramhall
Posts: 26705

The thick cable to the starter motor. where it passes the front differential.

18th Dec 2018 4:47 pm

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