Mine listed min 650 and the stock battery was 600 but it still worked OK. I have since replaced it with an 800CCA battery and no probs at all now!
With the small capacity battery it is not able to supply the current required and is pulling the voltage down low. At idle the alternator is not putting out a lot of current either and the engine stalling will be caused most likely by the battery voltage dropping to low to continue running the electrics required for the engine to run. In addition the excess load with make the alternator work extra hard meaning its a lot harder to spin it which puts an extra load on the motor at low revs and will be helping to stall it.
Running winch of which battery will depend on your dual battery system. If its a DC to DC charge system with no ability to connect directly to the alternator then I would not, as it will run the second battery down rapidly with a slow recharge. If it has the option to connect the batteries together with high current cables (like for starting assistance from the second battery) then this may over come that problem, but bear in mind the cables would need to at least as thick as the winch cables and any switch to join them together will need to be rated accordingly (in the vacinity of 500 amps).
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Cheers, Dave :)
2010 JK, then a 2015 KL Trailhawk, now a 2017 GC Trailhawk!
Over 5000 Club
Last edited by SeaComms; 25-01-2015 at 10:17 AM.
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