Disabling the Battery
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From: Neil Gerace on 4 Apr 2010 10:08 Scotty wrote: > There are a few things wrong with battery disconnects: > 1. You lose all your stored data on stereos etc > 2. You cant use yoru central locking any more when its disconnected > 3. If you disonnect when yourve a running engine you fry the alternator Not necessarily :) I found this relating to an FIA-approved 6-pole kill switch: "an FIA master switch has 4 small connections, one pair will be closed circuit with the switch on the other with the switch off, the pair which connect with the switch on should cut power to the ignition system, the other pair connect with the switch off one of them should be connected to the main live to the cars electrics ( not the one connected to the battery) the other is connected to the resistor, and the other end of the resistor should be conected to earth, without the resistor you risk blowing the diodes in the alternator every time the cut off is used to shut down the electrics with the engine running" http://bbs.turbosport.co.uk/showthread.php?125014-FIA-Master-Switch
From: Jason James on 4 Apr 2010 16:57 "George W Frost" <georgewfrost(a)gmail.com> wrote in message news:Vc_tn.17185$pv.3653(a)news-server.bigpond.net.au... > > "Dingo" <dingo963(a)yahoo.com> wrote in message > news:hobgr5tfn0b16ieomvbak21sv5kah2s341(a)4ax.com... >>A friend said he used a "lockable manual battery switch" on his Patrol >> instead of installing a car alarm. Is this something you can purchase >> and install yourself or would I (mechanically incompetent) need to >> visit an auto electrician. > > You can buy a battery disconnecting system from a truck spares place > The boss had one on a bus I drove and you had to turn the key and take it > out whenever you left the bus , say at a football ground or Zoo car park > or wherever. The Renault R10 had them also. Jason
From: Scotty on 4 Apr 2010 19:20 "Neil Gerace" <grassynoel(a)iinet.net.au> wrote in message news:4BB89D42.5010408(a)iinet.net.au... : Scotty wrote: : : > There are a few things wrong with battery disconnects: : > 1. You lose all your stored data on stereos etc : > 2. You cant use yoru central locking any more when its disconnected : > 3. If you disonnect when yourve a running engine you fry the alternator : : Not necessarily :) : : I found this relating to an FIA-approved 6-pole kill switch: : : "an FIA master switch has 4 small connections, one pair will be closed circuit with the switch on the other with the : switch off, the pair which connect with the switch on should cut power to the ignition system, : : the other pair connect with the switch off one of them should be connected to the main live to the cars electrics ( not : the one connected to the battery) the other is connected to the resistor, and the other end of the resistor should be : conected to earth, without the resistor you risk blowing the diodes in the alternator every time the cut off is used to : shut down the electrics with the engine running" : : http://bbs.turbosport.co.uk/showthread.php?125014-FIA-Master-Switch : Yeah, those units are not exactly simple ones and the cost for both installation and purchase would be greater than the alarm installation that the OP didnt want to do to start with. I used to use a battery disconnect on my rally car as required by the rules. If you do it all yourself its easy and relitively cheap. But if your capable of dogin that right your capable of installing an alarm system right as well.
From: The Raven on 4 Apr 2010 20:16 "atec7 7" <""atec77 \"@ hotmail.com"> wrote in message news:hpa57g$idi$2(a)news.eternal-september.org... > Dingo wrote: >> On Sun, 04 Apr 2010 10:53:41 GMT, "George W Frost" >> <georgewfrost(a)gmail.com> wrote: >> >>> ..... you had to turn the key and take it out whenever you left..... >> >> I'm assuming that's what my aquaintance meant. He also went on "Mine >> is a four position switch: <Battery 1> <both batteries> <Battery 2> >> and <Batteries disconnected & switch locked>".... > SImple way is to switch the battery and maintain a small power-feed > bypassing the starter with a light one or two amp fuse into the cars > internals and electronics Most cars I've looked at recently still use a separate feed off the battery terminal to power the cars electrics. This can also power the starter solenoid and be used as the alternator feed so a small one or two amp fuse usually won't cut it....from memory they usually have a 40-60A fusible link. On one of my cars I provided a heavy duty 'small' accessory feed with it's own switch but, this is a bit overkill and will probably get dumped when I rewire the car. Best bet is to put the switch on the main battery cable between the battery itself and the starter motor. Of course, it's best to hide this to make sure this is non-obvious, as anyone with an ounce of auto-knowledge can simply bridge the switch (a coin and some gloves will do it). As far as what battery switch to use, spend the money on a good one (Hella or Bosch). I know a few guys who keep having their cheaper units fail (which sounds a little dangerous - fire risk from a dead short).
From: D Walford on 5 Apr 2010 09:40
On 5/04/2010 9:20 AM, Scotty wrote: > "Neil Gerace"<grassynoel(a)iinet.net.au> wrote in message news:4BB89D42.5010408(a)iinet.net.au... > : Scotty wrote: > : > :> There are a few things wrong with battery disconnects: > :> 1. You lose all your stored data on stereos etc > :> 2. You cant use yoru central locking any more when its disconnected > :> 3. If you disonnect when yourve a running engine you fry the alternator > : > : Not necessarily :) > : > : I found this relating to an FIA-approved 6-pole kill switch: > : > : "an FIA master switch has 4 small connections, one pair will be closed circuit with the switch on > the other with the > : switch off, the pair which connect with the switch on should cut power to the ignition system, > : > : the other pair connect with the switch off one of them should be connected to the main live to the > cars electrics ( not > : the one connected to the battery) the other is connected to the resistor, and the other end of the > resistor should be > : conected to earth, without the resistor you risk blowing the diodes in the alternator every time > the cut off is used to > : shut down the electrics with the engine running" > : > : http://bbs.turbosport.co.uk/showthread.php?125014-FIA-Master-Switch > : > > Yeah, those units are not exactly simple ones and the cost for both installation and purchase would > be greater than the alarm installation that the OP didnt want to do to start with. > > I used to use a battery disconnect on my rally car as required by the rules. If you do it all > yourself its easy and relitively cheap. But if your capable of dogin that right your capable of > installing an alarm system right as well. > > Yep, not a great idea on a road car, I installed a battery isolator on the mates Clubman when he used to race it and it is useful as a theft deterrent but it has no unnecessary electrical gear, not even a radio and the Microtech ECU memory is not cleared when the battery is disconnected. Most late model cars have a factory immobiliser so unless it is an old car without an immobiliser I wouldn't fit and alarm, I'd just fit an immobiliser. Daryl |