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[SOLVED] Battery keeps draining (going flat) on my Fiat Ulysse. Fault diagnosis guide
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<blockquote data-quote="PC Electrics" data-source="post: 170773" data-attributes="member: 650"><p>If you are still getting 13.5v at the battery with th eengine idlng and most of the accessories on, then this says your alternator is okay and able to provide suffient "juice".</p><p></p><p>However, if you've flattened your battery several times it is highly likely it is knackered now and probably unable to hold its charge. (I recently had this after the wife left the map reading light on whilst we were on holiday).</p><p></p><p>Try charging your battery and then leving it disconnected when the car isn't in use to see if it still discharges.</p><p></p><p>With a freshly charged battery you need to try and measure the quiescent current drain. Set up a mulimeter in the positive line, set the bonnet switch to its closed position (with the bonnet up) and lock the car in the usual way. Wait 5 mins (could be up to 20 tho') for the ECUs to go to 'sleep'. The drain should be no more than a few milliamps (50 mA abs max). Any more and you need to check circuit by circuit where the drain is occuring. If the quiescent is okay, then I'd say it's the battery again.</p><p></p><p><span style="font-size: 8px"><span style="color: #C0C0C0">---------- AUTO MERGE Post added at 18:02 ---------- Previous post was at 18:00 ----------</span></span></p><p></p><p>Oh and bear in mind that if the ********yte is below 5C it is unlikely the battery will accept any charge, so bring it into the house somewhere warm to charge it up.</p><p></p><p><span style="font-size: 8px"><span style="color: #C0C0C0">---------- AUTO MERGE Post added at 18:03 ---------- Previous post was at 18:02 ----------</span></span></p><p></p><p>e-l-e-c-t-r-o-l-y-t-e</p></blockquote><p></p>
[QUOTE="PC Electrics, post: 170773, member: 650"] If you are still getting 13.5v at the battery with th eengine idlng and most of the accessories on, then this says your alternator is okay and able to provide suffient "juice". However, if you've flattened your battery several times it is highly likely it is knackered now and probably unable to hold its charge. (I recently had this after the wife left the map reading light on whilst we were on holiday). Try charging your battery and then leving it disconnected when the car isn't in use to see if it still discharges. With a freshly charged battery you need to try and measure the quiescent current drain. Set up a mulimeter in the positive line, set the bonnet switch to its closed position (with the bonnet up) and lock the car in the usual way. Wait 5 mins (could be up to 20 tho') for the ECUs to go to 'sleep'. The drain should be no more than a few milliamps (50 mA abs max). Any more and you need to check circuit by circuit where the drain is occuring. If the quiescent is okay, then I'd say it's the battery again. [SIZE=8px][COLOR=#C0C0C0]---------- AUTO MERGE Post added at 18:02 ---------- Previous post was at 18:00 ----------[/COLOR][/SIZE] Oh and bear in mind that if the ********yte is below 5C it is unlikely the battery will accept any charge, so bring it into the house somewhere warm to charge it up. [SIZE=8px][COLOR=#C0C0C0]---------- AUTO MERGE Post added at 18:03 ---------- Previous post was at 18:02 ----------[/COLOR][/SIZE] e-l-e-c-t-r-o-l-y-t-e [/QUOTE]
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[SOLVED] Battery keeps draining (going flat) on my Fiat Ulysse. Fault diagnosis guide
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