Battery light on

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morningglory
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Battery light on

Post by morningglory » Fri Jul 27, 2018 7:53 am

Hi,

My battery light has come on while driving a couple of times, and when it does, the fuel gauge drops to half the correct reading. This sorts itself out if I turn the ignition off and back on. 14.5v across the battery terminals when the engine is running but I've not been able to test this when the battery light is on. Car had a new battery a few years ago.

Anyone got any ideas? Dodgy earth somewhere? Alternator on its way out?

Thoughts much appreciated

Joe
1994 TZD Estate in 'Canal-Boat Green'

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Jaba
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Re: Battery light on

Post by Jaba » Fri Jul 27, 2018 9:02 am

First things to check would be the earth connections on the gearbox and the inner wing then clean up the 7 or 8 way connector under the battery tray. Is the connector on the alternator good and clean ? Apart from that it could be alternator or a wiring fault, possibly the fuel gauge wiring, you could disconnect it for a while for diagnosis. I think I would try another alternator first as that is a quick and easy swap.

Sounds like a good challenge anyway so good luck........
The Joy of BX with just one Citroën to my name now. Will I sing Bye Bye to my GTI or will it be Till death us do part.

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xantia_v6
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Re: Battery light on

Post by xantia_v6 » Fri Jul 27, 2018 1:20 pm

When the warning light comes on, is it full brightness or somewhat dim?

If dim, it is likely that there is a bad connection somewhere in the live feed to the dashboard, possibly a faulty ignition switch.

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morningglory
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Re: Battery light on

Post by morningglory » Sat Jul 28, 2018 5:38 pm

Thanks for the replies. Its due a service anyway so I'll do some tinkering. The light came on again today, not dimmed. Other electrics fine except fuel gauge and indicators, but turning the headlights on seemed to cure it. Maybe it's becoming sentient.
1994 TZD Estate in 'Canal-Boat Green'

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