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Doughboy
Member Since: 04 Aug 2020
Location: Tamworth
Posts: 90
  
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Over the moon. I had an inkling my headlight connection was bad to the fbh remote. Fluked it and no sign of voltage on the signal wire. Stripped the headlight plug back behind the connector that I had wrapped in electrical tae over the crimped connector and I had pulled the connector off. Put it back on and set remote box to 15mins on the jumper and it fired up.
I am definitely getting an under voltage problem on ignition thou. After a good run, battery is reading 12.3 volts. It is strong when starting. Running I am getting 15.15 volts (that shocked me but apparently its normal). So when I activate the follow me home for a second to get fbh fired, it's dropped the battery to 11.9v. After a few mins of the fbh running, battery is reading 12.15v and staying there.
After 15 mins she will start lovely but in limp mode until I suspect the ecu sees the battery replenished.
It's cranking and starting fine.
Is it definitely a battery going bad or is there a calibration I need to do on ecu.
Any advice v appreciated.
Cheers rich
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 31st Jan 2021 6:24 pm |
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Admirable
Member Since: 19 Jul 2015
Location: Fife
Posts: 1009
 
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I would give the battery a good charge before doing anything else. This cold weather is hard on batteries, one of the reasons car batteries are in compartments, sometimes insulated, under the bonnet, they don't like the cold!
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| 31st Jan 2021 6:39 pm |
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M3DPO
Member Since: 22 Sep 2010
Location: Notts.
Posts: 8069
  
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It depends what with and how you are checking the voltage, alternator is charging ok but 12.3volts is rock bottom. First thing to do is put a battery charger on over night, if you haven’t got a smart charger disconnect the battery to charge. It can when others can't,
It will when others won't,
It goes where others don't.
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| 31st Jan 2021 6:43 pm |
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Doughboy
Member Since: 04 Aug 2020
Location: Tamworth
Posts: 90
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Cheers.
Silly question, wouldn't the alternator charge it tho on run which I have done today for a sustained amount of time or will it just not do what a battery charger will.
If the charger does bring it up a few tenths, is it liable to drop back to 12.3 or would the charging system try and maintain the higher reading
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| 31st Jan 2021 6:59 pm |
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Trailered Movements
Member Since: 16 Jan 2020
Location: East/West Sussex Coast Borders
Posts: 1198
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Batteries are fickle things, my lad has a load in his workshop, charged and being charged. If he leaves a battery on the cold concrete floor, and another in a similar state on his battery pallet, the one that's been on the floor will lose voltage quicker than the one on the pallet.
I've seen it, and he's right, they don't like the cold, and even less so the damp and cold.
Dave 2011 Discovery 4 Commercial SDV6 (Gone)
2010 RRS TDV8 (Gone)
1980 OBLIC 4.0ltr Range Rover (went a long time ago)
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| 31st Jan 2021 7:52 pm |
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Motolab
Member Since: 18 Oct 2019
Location: Sleen
Posts: 1815
 
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Doughboy wrote:Cheers.
Silly question, wouldn't the alternator charge it tho on run which I have done today for a sustained amount of time or will it just not do what a battery charger will.
If the charger does bring it up a few tenths, is it liable to drop back to 12.3 or would the charging system try and maintain the higher reading
Alternators, will never charge your battery 100%.... they just don”t .... Good battery chargers, will top it up to 100%
A healthy battery is after a “full” charge around 12,7V or even more... but after a cold period... 12,7V should still be there approx..
A battery with only 12v reading is 100% EMPTY! Less fhan 12v is deep cycle... and damages a starter battery within a few hours... if not charged instandly..... So 12,3V is not very good.... there a problem then... (if that is the reading after just a charge) Best regards
Harold
Always looking for Pre '55's & Pre war British Motorcycles! knowing or having one for sale? PM please. I visit the UK 6 times a year
Ps. I edit my texts quite often, english is not my native language, so I will edit My “typo’s” etc. 
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| 1st Feb 2021 12:37 am |
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Doughboy
Member Since: 04 Aug 2020
Location: Tamworth
Posts: 90
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Really appreciate the advice. Looks like I need to get charging pronto.
I'll be gutted if this battery is fine to startup but knackered for running the ancillaries because of a lousy half volt.
Thanks
Rich
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| 1st Feb 2021 4:47 am |
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Motolab
Member Since: 18 Oct 2019
Location: Sleen
Posts: 1815
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I think you do not understand the principles behind battery’s.......
The Lousy
“1/2” volt as you call it is 50%+ of its charge! Best regards
Harold
Always looking for Pre '55's & Pre war British Motorcycles! knowing or having one for sale? PM please. I visit the UK 6 times a year
Ps. I edit my texts quite often, english is not my native language, so I will edit My “typo’s” etc.
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| 1st Feb 2021 10:06 am |
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