Thread: Red Battery Warning Light

What voltage do you get across the battery terminals when the engine is not running ..............

Originally Posted by BMKal

What voltage do you get across the battery terminals when the engine is not running ..............

Currently 12.2v

Sounds like could be alternator then. If battery is showing above 12V when engine not running, then you should be seeing high 13's - low 14's when the engine is running.

There are some things about the Disco's charging systems that are a bit different to other vehicles though, with "smart charging" etc - but I would still expect to see higher than 11.8V with the engine running if all was in order - and the red warning light indicates that something is not right.

No doubt there'll be others along who know more about auto electrickery than I do, but with those numbers, I'd be suspecting the alternator straight away.

Red warning light along with whirring that rises and falls with the engine speed and a burnt smell and even smoke are signs of dead alternator.


I had all of the above when mine died.


Very common!

Yeo confirmed, wildly changing voltages, and burning smell trying to get it to mechanic. Then the classic low voltage multiple systems failures and dash lit up like a Christmas tree and now dead.

Waiting for flatbed to take it to mechanic in the morning for a transplant.

Exactly what happened to me, except I borrowed a mate's battery which was enough to get the car home.

Grrrr! Today is not a permagrin day

Did a search on alternator failures on here and read that when the alternator goes it has no protection fuse and so it drains the battery to zero and kills the battery, I ran outside to check and sure enough it is down to 3v. I have disconnected but only time will tell if I killed it.

Then I realised that in order to tow it tomorrow unless they skull drag it, I will need to release the handbrake and with no power that will mean a manual release and the jack handle is in the back behind the cargo barrier. have dodgied up a coat hanger but am not able to test it until I need to use it in anger as the car is on a hill and I won't be able to reapply it

Also what Genius decided that the only way you could manually unlock the car is through the passenger side and that without power you can't unlock any other doors

Land Rover is not in my good books today, a bit more thought needed to have been applied to this car in some respects.

You could try disconnecting all cables from the rear of the alternator and connecting a battery charger to the battery (battery connected to vehicle) and unlocking all car doors and releasing the hand brake ( after chocking the wheels).