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Battery drains in an hour... - anyone else had this?

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11 Jun 2018 11:57 #193370 by Anselm
Hello,

I have a soft top O2 Jimny with a Bosch S4 battery...

Never ever had any problems starting, even at -10C, lovely sunny day on Saturday, took Jimny out... great...

Came to start it an hour later.., not enough power to turn over.. dead slow........ but no reason why it would go flat.,,had no lights on , radio goes off with ignition...... anyway charged it for 24 hours.started at 2.5 then down to only 0.5 amps after an hour so I don't even think the battery is duff.... and Jimny started fine yesterday ..... left it on drive....came back 2 hours later completely dead again...
No alternator warning lights when driving, ., even wheh not able to start, remote locking works fine... fans come on...

Anyone else experiecned similar.,..

(a) can a battery just fail like that?
(b) Any known power drains that I should investigate? How to do this?
(c) faulty solenoids / starter problems to check?


Any advice appreciated!!

Ans.

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11 Jun 2018 13:33 #193371 by Daniel30
My battery went just like that charged it over night, started OK but then the next day was dead again.. Changed the battery and its been fine.

May be charge the battery test it then leave it for a day and test again?

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11 Jun 2018 13:34 #193372 by Daniel30
My battery went just like that charged it over night, started OK but then the next day was dead again.. Changed the battery and its been fine.

May be charge the battery out of the jimny test it then leave it for a day and test again?
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11 Jun 2018 16:11 #193375 by Riccy
Use a volt meter to see whats happening.

1. with engine off and battery disconnected you should get around 12v

2. with battery connected and still engine off you should get around the same

3. with engine running you should get around 14v to charge the battery.

If No.1 is 10v or lower then new batt needed provided 2. and 3. are ok.

If No.2 is lower than no.1 then theres a drain on the batt somewhere (light stuck on, switch stuck, etc).

If no.3 is no change from 12v then the altenator or wiring connections are faulty

J999 MNY, M16 VVT, R7me gearbox & Rocklobster,
31x10.5r15 Cooper STT, 2x ARB Locker diffs & twin compressor,
6.5" total lift, Zookbob HD steering shock, Ignis recaro's
Custom front bar & arches, rocksliders & guards,
Snorkel, K&N, 13500lb Winchmax, Buzzweld, etc, etc

Plus ULYSSES (06' basher)
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11 Jun 2018 18:00 #193376 by rappey
could be a faulty starter motor as that gives same symptoms as a flat battery.
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11 Jun 2018 19:05 #193377 by starletman
If you haven't got a meter just disconnect a terminal and with the ignition off touch it against the battery if there is any noticeable spark then you have a drain.
Alternatively just change the battery as 99% that is the problem.
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11 Jun 2018 20:00 #193380 by petejones69
Had a similar problem recently - after taking it for an MOT and the garage carrying out some repairs to the wiring (brake lights and tow bar), the battery drained away with the Jimny just parked on the driveway. I disconnected one of the cables that went to the battery terminal that I didn't recognise and it seems OK now.

1999 Jimny with 3" lift, Rockwatt transfer box, under-body protection, Cooper STTs and folding cup holders...
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11 Jun 2018 20:34 #193382 by Anselm
Dear all

Thank you all very much for the detailed replies

Given me a lot of ideas to play around with this weekend

Will let you know what I find out

Thanks

A

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12 Jun 2018 08:17 - 12 Jun 2018 08:20 #193386 by mickt
Try load testing the battery. This checks the amperage of the battery which is the driving force of it. The voltage indication can be misleading as to the state of charge. If you need to have somebody else check it get the car running and take it to any place that sells batteries and ask them to test it for you. They will use a meter that allows a load across the battery which will show how the plates are inside the battery. They will have to stop the engine to do it though. You can buy the hand held testers and they are not too dear.
ebay item # 122651639406 is an example of it.
Last edit: 12 Jun 2018 08:20 by mickt. Reason: amendment to the text

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12 Jun 2018 18:35 #193400 by helijohn

Anselm wrote: Hello,

I have a soft top O2 Jimny with a Bosch S4 battery...

Never ever had any problems starting, even at -10C, lovely sunny day on Saturday, took Jimny out... great...

Came to start it an hour later.., not enough power to turn over.. dead slow........


I had almost exactly this not long ago with my Junior. It was simply a problem with the alternator belt not tight enough to grip enough to charge.

Do it right - use Hammerite
When the blue light is flashing I am kidding.
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