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Home > Technical > Revs keep dropping |
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SYFL2 Member Since: 16 Jun 2012 Location: Sheffield Posts: 2593 |
Battery and alternator ok ? |
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15th May 2017 10:15 am |
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Yorky Bob Member Since: 28 Apr 2015 Location: Yorkshire Posts: 4561 |
Try a battery conditioner first. The longer you leave it there is more chance of blowing the alternator if it is the battery needing a good boost or replacement. FL2 MY10 TD4 GS traded in at 2 years
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15th May 2017 11:54 am |
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littletriple Member Since: 27 Mar 2014 Location: kent Posts: 226 |
isnt the idle speed controlled by the ecu so it should be stable under varying power steering & electrical loads? 1978 Laverda Jota. Stolen...
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15th May 2017 12:02 pm |
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westville Member Since: 12 Jun 2015 Location: Dunston Posts: 1096 |
Have the battery and alternator professionally tested - AND see if there are any error codes No Longer the owner of a 2013MY Fuji White GS
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15th May 2017 2:11 pm |
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jamesderby Member Since: 22 Jan 2016 Location: Derby Posts: 28 |
Yeah I'll take it to get them checked. Battery was only replaced in Feb so shouldn't be that. I've checked them with a multi meter and the readings seem pretty normal. It's very random also as to when it does it. Not all the time. It's mainly when it's cold. |
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15th May 2017 8:17 pm |
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Trav Member Since: 27 Aug 2016 Location: Aberdeen Posts: 167 |
Batteries often get left on shelves until they are sold. If it has been sitting around long enough it will never be fully charged. Leave the battery on an overnight charge check alternator output and all battery earth and live cable terminals. |
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16th May 2017 9:10 pm |
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jamesderby Member Since: 22 Jan 2016 Location: Derby Posts: 28 |
Cheers I'm away this week so I'll pop it on charge when I get back. What sort of reading on the multi meter would I be looking for when the engines running? |
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17th May 2017 8:09 am |
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dorsetfreelander Member Since: 20 Jul 2013 Location: Dorset Posts: 4353 |
Most batteries have a date of manufacture stamped on them. Check that it really is new. 3 x FL1 2 manual + 1 auto
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17th May 2017 8:21 am |
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Trav Member Since: 27 Aug 2016 Location: Aberdeen Posts: 167 |
Voltage isn't really the best of indications when testing battery condition as surface change can throw you off. Use a battery tester they can be picked up for a few quid. It will give you the reading in amps. |
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17th May 2017 8:28 am |
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GeorgeB Member Since: 26 Feb 2012 Location: Warwickshire Posts: 54 |
You need to measure the capacity of the battery, in terms of the CCA (Cold Cranking Amps). Most battery suppliers will do this free of charge and give you a printout. Modern charging systems use alternators which are are controlled by the ECU and can instantly vary the alternator output to respond to fluctuations in demand from air-con, heated seats, windscreen etc. You shouldn't see a change in idle speed when the alternator load changes. |
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17th May 2017 10:41 am |
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