defender dinky Posted September 28, 2012 Share Posted September 28, 2012 hi, i want to charge battery on wifes p38, is there a certain way i should do this, because i think last time she had warning on the dash, 35 max, tried to jump it earlier and the horn started going off and central locking was going up and down, this happened same time last year battery dying every few daysbut battery is newish 18months, any ideas cheers dd Quote Link to comment Share on other sites More sharing options...
teslo Posted October 8, 2012 Share Posted October 8, 2012 There should be no issue just connecting charger to battery and start charging...i've never disconnected battery when charging in garage. Quote Link to comment Share on other sites More sharing options...
Cynic-al Posted October 8, 2012 Share Posted October 8, 2012 I don't disconnect mine to charge, but a friend had no end of alarm & c/l problems when he used to disconnect his p38 battery so in the end he ran cables from another battery to the alternator so that the car was still live when he disconnected it. If a good battery is randomly going flat start by pulling fuses out and sticking your ammeter in instead, atleast it will give you an idea what certain circuits are doing when the ignition is off. Quote Link to comment Share on other sites More sharing options...
defender dinky Posted October 8, 2012 Author Share Posted October 8, 2012 I don't disconnect mine to charge, but a friend had no end of alarm & c/l problems when he used to disconnect his p38 battery so in the end he ran cables from another battery to the alternator so that the car was still live when he disconnected it. If a good battery is randomly going flat start by pulling fuses out and sticking your ammeter in instead, atleast it will give you an idea what certain circuits are doing when the ignition is off. i thought of getting a twin battery set up some how, perhaps on a split charge set up, just a thought, dd Quote Link to comment Share on other sites More sharing options...
Cynic-al Posted October 9, 2012 Share Posted October 9, 2012 split charge setups usually disconnect the two batteries when the engine is off so that you don't run your engine battery flat whilst your camping at night with the lights and radio on so wouldn't help in this situation. he jsut had his on the floor whilst he was swapping the batteries. Quote Link to comment Share on other sites More sharing options...
pete3000 Posted October 26, 2012 Share Posted October 26, 2012 hi, i want to charge battery on wifes p38, is there a certain way i should do this, because i think last time she had warning on the dash, 35 max, tried to jump it earlier and the horn started going off and central locking was going up and down, this happened same time last year battery dying every few daysbut battery is newish 18months, any ideas cheers dd The 35 max is an air suspension error isn't it. usually if the vehicle can't raise off bump stops. Likley to be caused by jumping from flat batt. Seen all sorts of strangeness with low/flat voltages, all four indicators lit up and stayed on (not flashing). If it's anything like ours the flat battery is caused by the alarm rf receiver being an older variant that wakes the car up every other minute and flattens the battery. You can tell if this is happening by waiting till night time (easy this time of year) and looking at the centre console there is a red light next to P on gear shift. If you lock the car or even just close the door to and leave it two minutes the red light will go off. If it comes straight back on without you doing anything it has woken back up from the rf receiver in the back right hand side quarterlight panel. This draws 2 amps from the battery every time it wakes up, to power the becm. The frequency the fob/receiver uses is the same a some wireless weather stations/ doorbells/ door openers/ wireless energy meters etc etc. the cheap fix is to unplug the blue wire (antenna) which goes to the glass antenna, and use the remote (fresh batteries) within 1-2 foot of receiver. Or Buy the new rf receiver which works properly for £170 Or leave the rangie on trickle charge when not using Quote Link to comment Share on other sites More sharing options...
defender dinky Posted October 29, 2012 Author Share Posted October 29, 2012 i think i will have to draw fuses as mine is a manual gearbox no red light no p, i tried pulling blue wire off last year and came up on dash engine immobilised, thanks for info though dd Quote Link to comment Share on other sites More sharing options...
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