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| Chicken Drumstick Member Since: 17 Aug 2020 Location: Near MK Posts: 751  
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I could take a guess, it's 50:50, but no way to know based on that info.
Easiest way is to get it started, put a multi meter over the terminals and see if you are getting 13.5+ volts, if you are the alternator is probably fine. What vehicle are you talking about too might help..... not all engines and alternators have been the same since 1948  |
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31st Jul 2023 1:48pm |
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| Stiff1 Member Since: 09 Dec 2014 Location: Cornwall Posts: 597 
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Puma 2.4
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31st Jul 2023 1:50pm |
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| Dinnu Member Since: 24 Dec 2019 Location: Lija Posts: 3421  
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As long as the battery is connected, there is always a current draw on modern cars and Defenders. Thats to keep clocks, alarms etc running.
Lead acid batteries do not like going under 12.4V, and probably that caused permanent damage to the battery. There are a lot of cheap gadgets that go in the cigarette lighter and display the battery voltage. 1988 90 Hard Top, 19J Diesel Turbo, Shire Blue - Restoration ongoing 2012 90 CSW, 2.2TDCI, Santorini Black |
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31st Jul 2023 4:20pm |
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| Rupert605 Member Since: 27 Dec 2020 Location: Royal Wootton Bassett Posts: 12 
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Cold Cranking Amps are more important than voltage - a battery can be charged up and displaying 13.5v yet give problems starting if it has deteriorated over time. If you can get your hands on something like a Topdon BT50 batter tester this will perform a cranking test and tell you if the battery needs replacing.
Rupert Defender 50th GB165 Discovery 200 Tdi 1990 (gone) |
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31st Jul 2023 5:31pm |
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| Stiff1 Member Since: 09 Dec 2014 Location: Cornwall Posts: 597
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Thanks all, I'll let you know how I get on
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31st Jul 2023 7:53pm |
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