Battery light coming on , but goes out if I turn on snail fan ?

As title says , It doesn’t happen all the time , but every time it does ,and if I turn on the fan it goes out , is it possible that my alternator is over charging? Type 4 engine
Thanks


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When you turn on the fan the battery voltage drops as its quite a current drain.
Then it matches the slightly low alternator output voltage ... so the light goes out.

 

What's your battery voltage with the engine running?

 

I must admit I’ve not got around to checking, I will do it tonight when I get in from work


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Thanks Mike , so I think you are saying that the alternator is not working 100% ?


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It could mean the alternator output is a bit lower at low engine RPM than it should be, or the battery may be a little old and its resistance is higher than a new battery.

Measure the voltages . See what happens when you turn the fan on with the ignition on and then with the ignition off.
My money is on a well used battery.