first check the battery connections , are clean and tight, then check the starter motor connections are clean and tight. if all is ok there , i would suggest a visit to a car shop / garage to get the battery drop tested, and the alternator check for charging [ most places will do this free of charge] . is the fan belt in good condition and tight ? - this may not be the fault - but it wont help , finally - if battery and alternator are ok - visit an auto electrician - to check the rest of the electrics - [starter motor ] ?
duncan bladen, October 2006