palli17
Member
Registered: 21st Mar 08
User status: Offline
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as title says, have put a new battery in i still get the problem.
only happens when the cars boosting at full boost (9psi)
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Pete_gsi
Member
Registered: 17th Jul 13
Location: Cheshire
User status: Offline
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Have you checked all the usual things? i.e all earthing points and alternator.
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daine
Premium Member
Registered: 28th Feb 07
Location: rossington
User status: Offline
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Do a drop test on battery whilst the car is ticking over, if it show's 13.6 to 14.2 volts means the alternator
is working fine, When the car goes on full boost and the battery light comes on it just means the
alternator is turning off to stop it over charging the battery.
this is why when you put ignition on! battery light comes on (earth) when engine starts alternator becomes
live, turning light out. two lives, no current flow. 
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monkeytwizzel
Member
Registered: 10th Aug 11
Location: Chard, Somerset
User status: Offline
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Try another alternator on it and go from there sounds the easiest option.someone near you must have a spare one lying around.
Could just be the windings or diodes in the alternator breaking down but without taking it off and getting it tested you can`t tell so easier just try another.
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