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post #6 of (permalink) Old 18th December 2007
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Originally Posted by stevet14 View Post
Agree with madnoel, get the battery checked. How old is your battery, has it been completely drained before ? A sudden cold snap can kill an old battery, you may also have a drain which is causing the battery to go flat, this is usually caused by a bad earth or short within the electrical system.
I guess the real question is 'battery or alternator'.

The first check for battery voltage when the engine is running will give some indication about the state of the alternator.

Vehicle batteries must be checked under load. Switch the headlamps on (plus anything else like rear heated screen, fan, fogs, radio, hazards etc)
Then measure the terminal voltage on the battery. Should be a steady 11.5 or more if the battery is holding its own.

Measure the voltage over about a minute. If its stays constant (within 0.5 volts) then the battery's ok.

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