L322 Battery draining when parked

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malchick

malchick

New Member
Posts
8
Location
Ringwood
Hi all,

Apologies, my introduction to the forum ended up being a request for help, so hopefully i'm in the right area now.

I have a RR Vogue (petrol) 2002 and the vehicle was left overnight after a good 50 mile run out. The next day (approx 24hrs) the car didn't start. I conducted the usual checks as suggested by the forum members (wiggle the shift etc), but it didn't crank. I removed the battery and put on overnight charge in the house. The next day with 100% battery in it went and it started first time. I suspect something may be drawing power overnight when parked or i'm a complete idiot and left something on (if that is a possibility?) such as a switch/button, charger cable plugged in (no phone connected though). The battery looks new and i wondered where to start in terms of fault finding. The car is due a service, so i could let a garage take a look, but for my own peace of mind it would be nice to know if its something i can check myself. I'm not engine savvy, but i'm a quick learner. Thanks in advance.
 
Try removing one of the battery leads and with a multi meter set to amps measure between the disconnected lead and battery terminal. If it's showing power get an assistant to remove fuses one by one until the meter shows no power flowing. A circuit being protected by that fuse will be shorting somewhere. You need to make sure nothing is powered up when doing this, e.g interior light with the for open etc. I belief rangies do use some power all of the time anyway but you will be looking for a big drain.

Col
 
Hi Col,

Thank you, i don't possess a multi-meter, but i can ask around if any of my friends have one and give that a try.
 
The chief battery drain issues are the Final Stage Resistor for the heater blower motor, the front headlamp wipers not parking correctly, a duff Alternator regulator and water/damp ingress in the the nearside (UK) rear quarter frying the electronics.
 
Ok, so after charging the battery and putting it back in it fired up. I've left it for an hour and the battery is now at 60% and won't crank. When i put the key back to stage I there was a humming sound coming from the rear, dos anyone know what this could be? Thanks
 
malchick said:
Hi all,

Apologies, my introduction to the forum ended up being a request for help, so hopefully i'm in the right area now.

I have a RR Vogue (petrol) 2002 and the vehicle was left overnight after a good 50 mile run out. The next day (approx 24hrs) the car didn't start. I conducted the usual checks as suggested by the forum members (wiggle the shift etc), but it didn't crank. I removed the battery and put on overnight charge in the house. The next day with 100% battery in it went and it started first time. I suspect something may be drawing power overnight when parked or i'm a complete idiot and left something on (if that is a possibility?) such as a switch/button, charger cable plugged in (no phone connected though). The battery looks new and i wondered where to start in terms of fault finding. The car is due a service, so i could let a garage take a look, but for my own peace of mind it would be nice to know if its something i can check myself. I'm not engine savvy, but i'm a quick learner. Thanks in advance.
Click to expand...
As previously mentioned get a multi meter on the car , first charge the battery fit it you should have at least 12.5v start the car and test again if the voltage goes up then you can rule out alternator if it goes down or stays the same then it' more than likey the alternator. I had onereplced last year and for abosh it was about £500 as the radiator has to come out ps mine was doing the same and it was the regulator that was causi g the drain .
 
You should be looking for about 14.8v when engine is running, and a multimeter is an essential tool to be kept in the glove box at all times if you own a range rover.
 
barry williams said:
As previously mentioned get a multi meter on the car , first charge the battery fit it you should have at least 12.5v start the car and test again if the voltage goes up then you can rule out alternator if it goes down or stays the same then it' more than likey the alternator. I had onereplced last year and for abosh it was about £500 as the radiator has to come out ps mine was doing the same and it was the regulator that was causi g the drain .
Click to expand...
Regulators & diode packs can be replaced on alternators for little money.
 
barry williams said:
I had onereplced last year and for abosh it was about £500 as the radiator has to come out ps mine was doing the same and it was the regulator that was causing the drain .
Click to expand...
@malchick
Radiator doesn’t need to come out on the 4.4 but does need to be drained.

If you have a 12v test lamp you can connect that between the negative terminal and lead with it disconnected to test for a drain but much better to get a multi meter to test as already said.
Make sure you follow the battery disconnect procedure as you will have more problems.

Download Rave if you haven’t done so already.
If your battery is on its way it will go flat on its own as I had on a mates TD6 but parasitic drain is most likely.
 
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