Vehicle & Technical > Discovery

Battery woes

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Ralph:
Changed the alternatoron my 300tdi few months ago because for the last week of it life i had to rev it to about 2000rpm to get the light to go out! then it finally gave up and light would not go out at all.
Recently it started to get very sluggish turning over in the mornings and if it did not fire straight away the battery would die completely, so yesterday afternoon i went out and bought a new battery(£41 inc vat) Went out last night with the dogs after a few rabbits came home at 4 this morning and parked the truck up. Went out today at 3 pm flat battery!!! Put jumps leads on started straight away, been out and about in it and alternator is charging fine. Going to get the new batt tested in the morning but now i am begining to think that the old one was ok and there may be somthing drawing the power. If i take batt lead off and touch it on the terminal there is a small spark not much but a spark.
Does anyone know how much current roughly a totaly standard disco should draw with nothing turned on aprt from the clock and i presume the alarm which is factory fit??
Dont know yet exactly how much is being drawn as not got a meter till the morning.
Am really hoping it is just a dud battery!!!

davidlandy:
I ll bet the battery is ok and something else is at fault

Steve ray:
put a meter across your battery with say, headlights, blower and heat rear screen all ON .... see what output you're getting from the alternator.

karlo:
Had similar syptoms on a ford some years ago, turned out to be the starter motor?

Graham2:
I had a similar problem on my Range Rover a few years ago. It was the 'on it's last legs' starter moter. It was drawing so much from the battery to get it started, that it flattened the battery really quickly. When the AA guy put his booster thing on to get it going, smoke poured out of the starter! Got me to the garage that replaced it though. It might also be worth checking the earth straps as well. On the RR there are loads fixed to a bolt under the header tank on the off side inner wing, don't know if they're in the same position on the Discovery though.

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