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#1 | ||
FF.Com.Au Hardcore
Join Date: Dec 2004
Location: Brisbane
Posts: 976
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why cant you charge a car battery while the leads are connected?
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2018 Mustang GT |
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#2 | ||
Miami Pilot
![]() Join Date: Jan 2005
Location: ACT
Posts: 21,701
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You can (and I have).
But if the battery's already flat, why not just disconnect the negative lead anyway, and then charge it. There is a chance that a surge could fry your ECU, or melt some wiring and start a fire - it's not a huge chance, but the chance is still there which is why "they" recommend to take the leads/lead off.
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The Hammer: FG GTE | 376rwkw | 1/4 mile 11.793 @ 119.75mph 1.733 60' (4408lb) 1 of 60 FG MK1 335 GTEs (1 of 118 FG Mk 1 & 2 335 GTEs). Mods: Tune, HSD/ShockWorks, black GT335 19” staggered replicas with 245 & 275/35/19 Michelin Pilot sport 5s Daily: BF2 Fairmont Ghia I6 ZF, machine face GT335 19” staggered Replicas with 245s and 275s, Bilsteins & Kings FPV 335 build stats: <click here> Ford Performance Club ACT |
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#3 | ||
All Bran = Regular Member
Join Date: Feb 2006
Location: BrizVegas
Posts: 1,970
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Also, a trick that I learned only recently (after discarding many batteries over the years) is that if the battery is dead flat and just won't charge at all, stick it on 6v charge for an hour or two. A lot (all?) modern chargers won't charge if the battery is below a given charge state.
I tried it out on two 12v batteries that had been down the back of my shed for at least a couple of years. Neither would take a 12v charge but both did when primed by a 6v charge. |
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#4 | ||
FF.Com.Au Hardcore
Join Date: Dec 2004
Location: Brisbane
Posts: 976
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thanks guys. i think i have a small power drain somewhere and the battery is getting a bit weak. too make matters worse i dont drive the old girl much these days. hence i just wanted to give the battery a top up till i get it checked out.
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2018 Mustang GT |
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#5 | ||
FF.Com.Au Hardcore
Join Date: Nov 2005
Location: Brisbane - Southside
Posts: 970
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if you get a trickle type charger, you can charge the barttery with leads on. just need to connect the negative to an earth on the car and not the battery
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2008 FPV GT - Auto, Seduce Red, Leather Interior, Herrod Performance Air Box with K&N Pod Filter. 2018 4WD Everest Trend - Blue Reflex. |
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#6 | |||
FF.Com.Au Hardcore
Join Date: Feb 2005
Location: Melb north
Posts: 12,025
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Quote:
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#7 | |||
Treasure your balls?
Join Date: Jul 2005
Location: NW Melbourne
Posts: 2,570
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Quote:
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Meteorite T3 TS50 ESS |
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#8 | |||
All Bran = Regular Member
Join Date: Feb 2006
Location: BrizVegas
Posts: 1,970
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Quote:
Obviously it doesn't "fix" a buggered battery but if you've had a car sitting around for a while and battery won't take a charge this will most likely get it underway. |
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#9 | |||
Giddy up.
Join Date: Dec 2004
Location: Kramerica Industries.
Posts: 15,633
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Quote:
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#10 | |||
FF.Com.Au Hardcore
Join Date: Feb 2008
Location: Geelong, Victoria
Posts: 4,417
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Quote:
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#11 | |||
OzFalcon.com.au
Join Date: Oct 2007
Location: Wallan, Vic
Posts: 610
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Quote:
and we have the same issue with not getting a trigger signal for want of a better word to start charging, i hook up a second battery in series and put it on 24v charge, works a treat, only need to jump start it like that for a minute or 2 before u can charge it normally |
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#12 | |||
FF.Com.Au Hardcore
Join Date: Feb 2008
Location: Geelong, Victoria
Posts: 4,417
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Quote:
Amiers, you could check to see how much current is being drawn with a simple multimeter. With everything off, I think about 5-10 mA is normal, someone correct me if I'm wrong. I had a faulty relay once, and it was drawing something like 40-50 mA. |
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#13 | |||
Giddy up.
Join Date: Dec 2004
Location: Kramerica Industries.
Posts: 15,633
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Quote:
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#14 | |||
Former BTIKD
![]() Join Date: Mar 2005
Location: Sunny Downtown Wagga Wagga. NSW.
Posts: 53,197
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Quote:
Well, this works in NSW...things might be different Nth of the border ![]()
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Dying at your job is natures way of saying that you're in the wrong line of work.
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#15 | |||
Miami Pilot
![]() Join Date: Jan 2005
Location: ACT
Posts: 21,701
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Quote:
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The Hammer: FG GTE | 376rwkw | 1/4 mile 11.793 @ 119.75mph 1.733 60' (4408lb) 1 of 60 FG MK1 335 GTEs (1 of 118 FG Mk 1 & 2 335 GTEs). Mods: Tune, HSD/ShockWorks, black GT335 19” staggered replicas with 245 & 275/35/19 Michelin Pilot sport 5s Daily: BF2 Fairmont Ghia I6 ZF, machine face GT335 19” staggered Replicas with 245s and 275s, Bilsteins & Kings FPV 335 build stats: <click here> Ford Performance Club ACT |
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#16 | ||
OzFalcon.com.au
Join Date: Oct 2007
Location: Wallan, Vic
Posts: 610
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i have never gotten why people say to earth off the body, it makes no sense what so ever
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#17 | ||
FF.Com.Au Hardcore
Join Date: Jan 2008
Location: Sunbury, vic.
Posts: 3,110
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In all wiring you have some resistance, some capacitance and some inductance, normally this can act as a small kind of filter to noise etc. Now when you jump start a car and you put the jumper earth onto the car, you are connecting it directly to the same earth as used by the engine management. therefore holding the engine managements voltage more consistantly through the other cars battery.
When you turn the car over the other cars alternator will load up and increase its current output, when the load is remove the voltage can spike, this isn't normally a problem cause the alternator isn't working when you normally would start your car. Now when cranking you get a voltage drop over the earth cable to the car, you get a voltage drop once again to the body, since the earth is normally joined to the engine and then to the body, its rather a big voltage drop over the cable, when that power is removed you get a reverse spike of power down that cable, due to the inductance of the wire etc. couple this to the spike from the alternator if placed upon a faulty battery around 16volts it'll spike to, reverse voltage on cable around 1-5volts depending on how good the cable is, so you end up with a possible 21volts over the eec, instead of a possible 16volts if it was hooked up to ground of the car. Now doing this with a battery charger has no real point, its not being cranked at time or anything so it wont hurt it. If your battery is good, and your earth cables are nice and thick it once again wont hurt it. At the end of it all 99.9999% of the time it wont hurt it. It's just that it could happen, so.................. |
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#18 | |||
FF.Com.Au Hardcore
Join Date: Nov 2005
Location: Brisbane - Southside
Posts: 970
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Quote:
actually took one back thinking it wasnt working correctly until i re-read the instructions ![]()
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2008 FPV GT - Auto, Seduce Red, Leather Interior, Herrod Performance Air Box with K&N Pod Filter. 2018 4WD Everest Trend - Blue Reflex. |
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