Battery drain help needed

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atromford

atromford

Member
Posts
12
Location
romford
Mines a 2002 defender 110 td5. battery’s started going flat and happens within 48hrs. put meter across the fuses and found a drain on one circuit. Haven’t narrowed it down yet so pulled the fuse and that seemed to stop the drain. However, the battery’s still going flat and I’m not picking up a drain that I can see. Any ideas where I can look next and where I go from here other than a auto electrician!
Ps. battery still appears to be ok
 
Disconnect battery for two days and see if it goes flat,the drain you have found may be something that remains live.
If disconnected battery goes flat it is an internal short.
 
Have you fitted anything in your landy lately,

I once had a starter motor bearing wear, which allowed the starter rotor to short to earth giving symptoms of a dead battery when trying to start.
 
Scooby22 said:
Have you fitted anything in your landy lately,

I once had a starter motor bearing wear, which allowed the starter rotor to short to earth giving symptoms of a dead battery when trying to start.
Click to expand...
Only thing fitted is new light stalk for headlights but was few months ago
 
Just check battery voltage then disconnect alternator for a few hours. Make sure this cable is covered up you don't want a short.

Recheck battery voltage later.
This may help
 
If the voltage remains OK after leaving the alternator disconnected for a few hours, but when reconnected you see the voltage slowly decrease as it gets depleted, you've isolated the drain as being within the alternator wiring
 
Do you have an ammeter? If the battery is going flat in 2 days you have something drawing about 1 Amp or 12 Watts. Disconnect positive battery cable and connect through ammeter. See what current is flowing. You can then pull fuses one by one to see if you can stop it.
 
headintheclouds said:
Do you have an ammeter? If the battery is going flat in 2 days you have something drawing about 1 Amp or 12 Watts. Disconnect positive battery cable and connect through ammeter. See what current is flowing. You can then pull fuses one by one to see if you can stop it.
Click to expand...
Yes that is how I found the original drain. With the fuse pulled it drops to a minimal drain. However the battery’s still going flat and can’t see any other drains from putting amp meter on the other fuses
 
Use the ammeter in line with the battery itself.

Assume battery about 80Ah. It shouldn't drain if left for a month = 720 hours 80/720 = 110mA

Anything above 0.1A = 100mA is too much.
 
Checked all fuses I know off, including any aftermarket inline ones for kites etc. Has got aftermarket alarm fitted. With the suspect fuse pulled and altanator disconnected I’m still drawing .4 amps but unable to trace where from as pulling fuses 1by1 has no affect
 
Batterys got good voltage if left disconnected tho will have to leave it for a period and double check there’s no drop on it. haven’t checked all the relays and will have to strip it down and locate the alarm battery/ fuse
 
Tried everything suggested to best of my ability but no joy . Anyone recommend a good garage/auto electrician north essex area ish?
 
400mA sounds like it could be an aftermarket stereo or something that has been wired in before the fuse box, might be worth checking out that area behind the radio for some dodgy wiring jobs
 
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