Author Topic: Battery drain  (Read 2047 times)

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Offline catford lad

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Battery drain
on: 07 December, 2019, 06:28:50 AM
Any ideas on battery drain? (I know the battery is good, as is charging system) Have thought maybe HISS is the culprit, but it appears the only way to bypass this is a US spec ECU/loom. Surely there is a simpler way to delete HISS? Have lived with this problem forever, but looking to sell now, so really need to get it sorted.
Also slow cranking starter motor even on full charge. Starter motor has been bench tested and whizzes like a good 'un. Any thoughts on either of these issues? I know both these problem are not uncommon, but have never heard a definitive solution.


Online Art

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Re: Battery drain
Reply #1 on: 07 December, 2019, 10:14:11 AM
Battery drain and slow cranking with a fully charged battery could indicate a faulty battery. Thoughts and maybes aside a multimeter is your best friend here to check the numbers and prove the symptoms. Two simple tests

1) Battery standby current drain test - Remove the battery negative lead and connect a multimeter between the battery’s negative lead and negative terminal. Standby current drain should be less than 0.5mA (0.0005A) for your MKI (SC58).

2) Battery CCA (cold cranking amps) test - check the voltage drop across the battery terminals while cranking the engine if the voltage drops below 9.5v then suspect a battery fault.

Last Edit: 07 December, 2019, 10:17:04 AM by Art