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Battery light still on after new alternator fitted

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skunk38

Member Since: 05 Jan 2024
Location: South Wales
Posts: 56

2007 Discovery 3 TDV6 HSE Auto Stornoway Grey

Battery light still on after new alternator fitted

I had the battery light staying on and after recommendation, changed the alternator and battery as I was only getting 13V with it running.
I have fitted a recon DENSO unit and I cleared the fault with my IID tool, but the light came back on again a short while after starting.
The fault coming up is -
P0622-29 - Generator field terminal circuit
General signal failure - signal is invalid (2B)

Am I missing something else, or does the new alternator need a bit of time to get recognised?

Cheers for any help. Volunteer driver with 4x4 Response South East Wales
Volunteer Rider for Blood Bikes Wales

Land Rovers owned -
Disco 1 - 300 Tdi - dead
Disco 1 - 200 series - 3.5 V8 on LPG - dead
Disco 2 - TD5 - sold
Disco 1 - 300 series - 3.9 V8 on LPG - sold
Disco 3 - TDV6 HSE - current

14th Feb 2024 2:53 pm

Pete K

Member Since: 15 Jan 2016
Location: GL
Posts: 10399

2005 Discovery 3 TDV6 HSE Auto Rimini Red

It does take a minute or so.

But if you continue to have problems, have a look at the engine ecu connectors behind the battery.
Make sure they are dry.

Check the 5A alt fuse in the fusebox if you haven't already.

14th Feb 2024 3:14 pm

skunk38

Member Since: 05 Jan 2024
Location: South Wales
Posts: 56

Cheers again Pete K, I've checked the fuse again, and all the connectors appear ok.

It's frustrating now, as I may have wasted time & money changing the battery and alternator (although I now know how to do another job on it

)

I'm going to have a look through the wiring diagram to see where the cables run and see if I can find an issue. I'll probably check continuity between the alternator plug and fuse etc.. when I get time.

At least I know the parts are working and I'm actually getting the right voltage. Volunteer driver with 4x4 Response South East Wales
Volunteer Rider for Blood Bikes Wales

Land Rovers owned -
Disco 1 - 300 Tdi - dead
Disco 1 - 200 series - 3.5 V8 on LPG - dead
Disco 2 - TD5 - sold
Disco 1 - 300 series - 3.9 V8 on LPG - sold
Disco 3 - TDV6 HSE - current

14th Feb 2024 5:41 pm

skunk38

Member Since: 05 Jan 2024
Location: South Wales
Posts: 56

The battery light is still staying on regardless of how fully charged the battery is, so it's possibly the monitoring or control cables continuity to the ECM.
I haven't had a chance to check the wiring yet as had a lot of other things going on, but I was wondering if there are any voltage values on the 'alt con' and 'alt mon' for when I test? I'm obviously going to do continuity tests before anything else. Volunteer driver with 4x4 Response South East Wales
Volunteer Rider for Blood Bikes Wales

Land Rovers owned -
Disco 1 - 300 Tdi - dead
Disco 1 - 200 series - 3.5 V8 on LPG - dead
Disco 2 - TD5 - sold
Disco 1 - 300 series - 3.9 V8 on LPG - sold
Disco 3 - TDV6 HSE - current

7th Apr 2024 1:24 pm

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