Mud-club

Vehicle & Technical => Range Rover => Topic started by: ScrumpyJack on October 14, 2007, 20:32:08

Title: P38 power drain.
Post by: ScrumpyJack on October 14, 2007, 20:32:08

My battery keeps going flat :cry:
I can put a fully charged bat on it, then within a week its flat, so I jump start it drive it around or leave it running for a couple Hrs next day flat and so on,

there is 600w amp fitted, thought it might be drawing power over night, unplugged it but no difference, occasionally when I turn the ignition on it gives an alternator fault, but goes out when car started, put a meter on and it shows bat charging at just under 14 V,

Thought it might be a bad bat so bought a new one, same thing.

any ideas, can the alternator be drawing the power somehow when car turned off,

Title: P38 power drain.
Post by: thermidorthelobster on October 14, 2007, 20:45:52

Probably the alarm ECU coming on because it's sensing radio interference from a weather station, garage door sensor or similar.

There's an updated ECU which doesn't have this problem.

Have a look at www.landywiki.co.uk for details and how to troubleshoot.

Title: P38 power drain.
Post by: ScrumpyJack on October 14, 2007, 22:19:39

Andycwb suggested the same thing, but cant find anyone close to me with 1 of those type weather stations, and defiantly no remote garage doors, recently bought and suspect the lad had the same prob.

Title: P38 power drain.
Post by: thermidorthelobster on October 14, 2007, 22:26:26

Have you disconnected the alarm ECU to see if the drain still occurs?

Also see http://www.landywiki.co.uk/index.php?title=BeCM

Title: P38 power drain.
Post by: ScrumpyJack on October 15, 2007, 00:02:03

I havnt as yet, will do the sleep test first and run from there, prob is time but need to get it sorted to keep the wife happy,

watch this space.

Title: P38 power drain.
Post by: ScrumpyJack on October 29, 2007, 22:32:44

Well after a couple of weeks hard graft I’ve managed to get a bit of a breather for a week, so can now start having a look at the car again,

So, where do you find the alarm ecu, I’ll try unplugging that to check, but just out of interest, I stuck a bat tester on it tonight while it was running, with nothing on, it was reading 14v, with all the lights and the heater full blast it reads 11.24ish, even with the revs right up only 11.24ish.

Does this seem a little low, might try a new alternator as it's still got the original 1 on making it 13 year old, I have also noticed after I started the car one day drove it for about 10 mins the alternator was red hot, even after a couple of hrs it was still very hot, my other V8's aren’t like that.

Title: P38 power drain.
Post by: Rossko on October 31, 2007, 02:51:29

Quote from: "ScrumpyJack"

.... even with the revs right up only 11.24ish.  
Does this seem a little low,

Yes!  Its knacked.  It might just be worn brushes at that age.  Mind you it is just possible you have a bad earth connection between engine-body-battery.  Check for voltage between battery neg post and alternator body while doing that load test, should be less than 0.5V difference.

cheers, Ross K

Title: P38 power drain.
Post by: ScrumpyJack on November 06, 2007, 00:34:07

Yipeeeeeee,
New alternator did the job, loads of charge now with everything on, managed to get a 120amp brand new of a pal for £100, which was nice  :D

Just need to sort out the heating now :?