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Old 13-05-19
viking0712 viking0712 is offline
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Join Date: May 2015
Location: Sydney
Posts: 49
Default Battery woes....

I have a NT diesel and have had an intermittent issue with flat battery.
Run a Century Main battery and a Optima second battery.

A month or so ago went for a tyre repair and they run a meter over the battery and said it looked on the way out, which I thought at the time was a ploy to buy an overpriced battery from a tyre dealer.
Anyway took it straight up to Batteryworld where I bought it and it came up as all good.

A week or so later , flat battery and jumpstarted, nothing left on to drain battery.... bit of a mystery.

All good until this morning and flat again, NRMA came and checked and Battery supposedly dead. Drove it a bit yesterday with no issues and kicked first go easy.
NRMA jumped it and took into Batteryworld to check and supply new Optima.
They said the battery comes up as all good on their testing gear !!
Alternator looks like its is charging the battery.

Ive elected to throw the new battery in it as doesn't want to get stuck if it is the battery but can anyone else come up with another reason other than maybe the battery not holding charge and just discharging randomly ?

Thanks for any replies.

Last edited by viking0712; 14-05-19 at 07:35 AM.
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Old 13-05-19
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Hatto Hatto is online now
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Location: Mandurah WA
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Remove pos and neg terminals and give them a thorough clean up to ensure a good connection. Also make sure both terminals are tight.
This is where I'd start. Simple things first.
Cheers, Hatto

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Old 14-05-19
viking0712 viking0712 is offline
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Join Date: May 2015
Location: Sydney
Posts: 49

New Optima Yellow top in and kicked nicely this morning as you would expect.

Noticed yesterday the Redarc Isolator stayed on after the car was off for an hour or so.
Googled that and on the Redarc site that can be normal especially when installing a fully charged new battery.

Will keep an eye on it and hopefully the battery was faulty and not holding charge as the alternator is pumping charge into them ok.
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Old 14-05-19
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sharkcaver sharkcaver is offline
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Yes it is normal. The isolator will be closed whenever the main battery voltage is 12.7v or above. You will find a new battery will always be up near 13.0v and hold this surface charge for some time. Eventually, it will settle to the point where the isolator closes after a period. Its just what new batteries do.
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