Hi all,
Came home from shopping yesterday and left the tailgate open for about half an hour - and the aux. battery discharged itself completely. The vehicle could not be started. I proved that my compact jump starter pack was able to allow the car to be started, but the aux. battery dropped out again shortly after. So, put my 20A charger on and let it fully recharge the aux. Please see June 17... pics.
Something similar happened last year when I left the tailgate ajar overnight. At that time I put it down to the 10W bulb draining the 12V battery and replaced it with a LED lamp (31mm festoon from memory). Thought this should sort the problem, even if the lamp stayed on for weeks.
But yesterday's event was bizarre. As if having the boot/trunk lamp triggers a high current discharge of the 12V battery. (Wish I knew what the Hyundai guys were on when the designed the aux. battery system - I'd order a kilo!)
Anyhow, the battery seemed to recharge OK and remain so overnight (charger disconnected at about 16:50). See June 17_18... pics. But notice, no aux. battery top-ups from the vehicle system overnight. Perhaps just above the threshold to trigger same?
Now to today, did a 90km round trip to 'the big smoke' (well, next big town...) with no problems. Notice that there were some vehicle top-ups while driving. On arriving home, left the tailgate open for just a few minutes while unloading and - there goes the aux battery charge again. Please see June 18...pics.
So, wise ones, what do we think the diagnosis is here? Is my 12V battery cactus? (The rate of discharge and 'supposedly' full recharge looks sus to me.) Do I have a problem with in-vehicle charging system? Does my LED lamp actually draw 30+ Amps???
BTW, my 5 year warranty is up in a month, so if my in-vehicle charger has problems, I'll have to flag it to the dealer very soon. Cheers.
Came home from shopping yesterday and left the tailgate open for about half an hour - and the aux. battery discharged itself completely. The vehicle could not be started. I proved that my compact jump starter pack was able to allow the car to be started, but the aux. battery dropped out again shortly after. So, put my 20A charger on and let it fully recharge the aux. Please see June 17... pics.
Something similar happened last year when I left the tailgate ajar overnight. At that time I put it down to the 10W bulb draining the 12V battery and replaced it with a LED lamp (31mm festoon from memory). Thought this should sort the problem, even if the lamp stayed on for weeks.
But yesterday's event was bizarre. As if having the boot/trunk lamp triggers a high current discharge of the 12V battery. (Wish I knew what the Hyundai guys were on when the designed the aux. battery system - I'd order a kilo!)
Anyhow, the battery seemed to recharge OK and remain so overnight (charger disconnected at about 16:50). See June 17_18... pics. But notice, no aux. battery top-ups from the vehicle system overnight. Perhaps just above the threshold to trigger same?
Now to today, did a 90km round trip to 'the big smoke' (well, next big town...) with no problems. Notice that there were some vehicle top-ups while driving. On arriving home, left the tailgate open for just a few minutes while unloading and - there goes the aux battery charge again. Please see June 18...pics.
So, wise ones, what do we think the diagnosis is here? Is my 12V battery cactus? (The rate of discharge and 'supposedly' full recharge looks sus to me.) Do I have a problem with in-vehicle charging system? Does my LED lamp actually draw 30+ Amps???
BTW, my 5 year warranty is up in a month, so if my in-vehicle charger has problems, I'll have to flag it to the dealer very soon. Cheers.
