I HAVE A 2001 JAQ S-TYPE ABOUT EVERY 2 WEEKS THE CAR WON,T START NEW BATTERY,IT WON.T LET YOU JUMP IT .I HAVE TO JUMP OFF ALTERNATOR TO GET IT TO START,SOME ONE TOLD ME THAT IT GOING INTO SLEEP MODE,AND WON,T WAKE UP.WHAT IS CAUSING THIS .AND WHEN I GO TO THE ALTERNATOR ITS SENDING POWER BACK ,AND WAKING IT BACK UP,BUT THEY DIDN,T KNOW WHAT CAUSES THIS PLEASE HELP THANKS
Cant help a lot on this,yes it has a sleep mode mine has as well to conserve battery life,try asking your local jaguar dealer if they have come across this before and what the cure is.if they say expensive repairs then fit a battery isolator switch or a direct feed cable with a switch in cab somewhere from battery to altenator or a feed from starter motor relay to altenator
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