Help, my battery is dead every morning.

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hawky666

Well-Known Member
Posts
1,663
Location
Calllington, Cornwall
Yes, it's me again, still trying to fire fight probs with this 90.
Here's another.

Every time i charge the battery up, its dead the following day.
Now i've had the battery tested.. and it's fine. The previous owner has fitted a battery kill switch. Probably as a quick fix to this exact problem.

Lets say that wiring wasn't his strong point and i have sorted most of it now, putting radio and cb t ignition live and getting all the lights and accessories actually working. I thought this would solve the problem somewhere along the line but it hasn't.

My only other guess is that it's something to do with alternator.

When he did the 300tdi conversion he had let the alternator wires sit against the engine and when i changed the engine i undid the alternator wires and on inspection they had all been melted down to the bare wire so i had to re do the wires. Problem is that although one was a spade fitment and thin wire.. self explanatory to fitting back, but the other 2 had the same coloured and thickness wire aswel as same fittings on ends. These might be wrong way round but going by the way the wires were bent etc, i'm pretty sure i got them back on right.

Something tells me it's something else!!!!. This is a big battery and it must be something with a heavy draw to get it emptied so quickly.

Any ideas folks???????
 
first off dissconnect the battery completely overnight to check it retains its charge when diss connected.

once youve confirmed the battery try dissconnecting the allternator overnight


then youre looking for a short circuit some where, either a visual check for bare wires or you can get a clamp meter
New UNI-T UT203 AC / DC AMP clamp meter UT-203 | eBay

the jaws clip arround a wire , sense the magnetic field and give a current reading.... can save hours tracing bad wiring..... beware you will need one that measures dc current ... the cheaper ones will only do ac current which aint no good for vehicle electrics.... only buy one where the ad specifically says it does dc current. you dont need to spend silly money on an accurate one... just an indication of current flow is enough you dont need to measure it exactly.
 
As said disconnect first, I have known plenty of batteries that test OK but wont retain charge. If it does then its in the landy, if its had extras added first pull the fuses on these, if it retains charge then your heading in the right direction, if it doesnt then its an OE system. Next thing to do is when its all turned off as you woulds leave it start to pull fuses and check for a current draw with a multimeter, do one at a time and eventually you should find what circuit it is in. If your unlucky it may be something that is pre-fusebox or the box itself, if so then get an auto sparky to have a look...
 
I've had battery disconnected for a wk and been fine. Had drop test done on it showing its fine also.. s know that ones ruled out.
Got it charging on vehicle again now. Will def disconnect alternator tonight and see result of that tomorrow.
One of those current testers sounds very useful so will have to have one of them.

Thanks.
 
when my battery kept going flat it turned out to be the ACE pump trying to operate long after someone had converted the suspension to springs...they hadn't had it switched off at the ECU so the pump was clonking away all the time thinking it was still connected...electronics again :(
 
Would i have this on a G reg 90?? don't even know what it is or where to get that checked out. Good suggestion though. Thanks.

I've now changed the alternator for another with no difference and done the whole pulling fuses thing, with nothing found, so i am willing to look at all suggestions anyone might have.

Thanks again all.
 
Would i have this on a G reg 90?? don't even know what it is or where to get that checked out. Good suggestion though. Thanks.

I've now changed the alternator for another with no difference and done the whole pulling fuses thing, with nothing found, so i am willing to look at all suggestions anyone might have.

Thanks again all.

ACE ? Active Cornering Enhancement. As fitted to a disco 2. I suspect not:)
 
Would i have this on a G reg 90?? don't even know what it is or where to get that checked out. Good suggestion though. Thanks.

I've now changed the alternator for another with no difference and done the whole pulling fuses thing, with nothing found, so i am willing to look at all suggestions anyone might have.

Thanks again all.

Was the replacement alternator new or secondhand?

What is the voltage showing in the battery after being left for a night?
 
As said you need an ammeter on it, identify the current draw, then disconnect circuits one by one to see when it drops to next to nothing. Stabbing in the dark and waiting a few days will take forever:)
 
both were second hand. 1 with engine that came with vehicle and the other was on the new engine purchased and fitted. I drove this vehicle before engine was removed and at that point it hadn't been started for a few days and went first time so had no reason to suspect it!!
I'm not sure on voltage left but must be very low or nothing as no dash lights etc at all.

When tester is on as a breach to live with battery disconnected at live and earth still connected, ignition off and isolator not engaged it is still drawing .72amps.
 
switch on the isolator and it reads 0 so at the moment i just isolate it every night and no problem. But that's not the answer and i still want to get it correct simply on turning ignition off.
 
both were second hand. 1 with engine that came with vehicle and the other was on the new engine purchased and fitted. I drove this vehicle before engine was removed and at that point it hadn't been started for a few days and went first time so had no reason to suspect it!!
I'm not sure on voltage left but must be very low or nothing as no dash lights etc at all.

When tester is on as a breach to live with battery disconnected at live and earth still connected, ignition off and isolator not engaged it is still drawing .72amps.

If there is no dash lights at all I would be suspecting failed diode pack in the alternator.

Does it still go flat with the alternator disconnected over night?

Does it still have the original fuse box or has it been swapped for the later blad fuse type box?
 
now that, i have no idea on and am not sure how t find out.
newer Engine came complete with all ancillaries from donner disco with the exception of the part that you can adjust the power / revs etc from. The newer vehicle had an immobiliser system so had to be changed over.
 
Original fuse box still. havn't disconnected alternator overnight as simply swapped it out with no change so took it that 2 alternators couldn't do same when i know one fired up ok after a few days idle on its original vehicle.
 
Connect your meter, then unplug any connections you can find. Keep an eye on the meter when it drops to zero follow that wiring to its destination and you should find it.. Because of its history you don't really know how many bloody stupid things have been done to it so it really could be anything!
 
Original fuse box still. havn't disconnected alternator overnight as simply swapped it out with no change so took it that 2 alternators couldn't do same when i know one fired up ok after a few days idle on its original vehicle.

You haven't jump started the vehicle and accidently connected the jump leads up back to front have you?
 
I'm going to hit disconnecting every bleedin thing i can as soon as my mates free to give me a hand and save me going back and forth to the meter.
This thing was deff screwed electrically so wouldn't be surprised at anything right now.

I've never jump started her, only started her from the battery being charged.
But i am very used to jump starting things, including the mrs lol, so pretty sure i've not got anything wrong there.
 
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