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At the moment I have one of those quick release screw off things on the negative terminal so I can disconnect the battery when leaving the car for a while. Works great.  I'm looking at relocating the battery into the boot, which will end up meaning the main positive feed runs from the rear to the front of the car. As such I thought I could fit an inline kill- type switch so I could disconnect the battey from inside the car instead of having to pop the bonnet.  Looking around, if i was after a true kill-switch arrangement it would be in the +ive side/connected to the alternator to stop all running. I'm not going racing though/that's not why...just a bit confused if there is more risk having a cut off on the +ive Vs -ive. Risk of creating a short? |
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Last Edit: Feb 3, 2019 11:18:34 GMT by sarkie83
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Phil H
Posted a lot
Posts: 1,448
Club RR Member Number: 133
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Positive or negative strictly makes no difference, just that generally batteries are connected to the body pretty close so it’s easier in the positive line as it’s usually easier to get at. They are normally connected in the positive line though.
If you might need to cut it off whilst running you’ll need what they call the FIA version which has a resistor to dump the output from the alternator to stop it self destructing.
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On my Rover P5B, the battery is also in the boot and i bought a RC remote battery main switch which i fitted on the battery in the boot so i can switch it on and off with a fob. Being in the boot it is not so easy to get to by thieves  Its the small black box with the yellow knob Peter |
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Good idea - I hadn’t thought of a relay switched isolator (remote or otherwise)!
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Dez
Club Retro Rides Member
And I won't sit down. And I won't shut up. And most of all I will not grow up.
Posts: 11,712
Club RR Member Number: 34
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To be truly effective a battery cutoff should be on the positive side and as close to the battery as possible. Othwise you still have the potential for large amounts of wiring to be live, even if the circuit is switched off.
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The sort of isolator switch your looking at is designed to be fitted in the earth/negative battery line, this is so you don't have exposed live terminals and if anything comes loose there will not be a dangerous dead short. There is nothing to stop you fitting one on the positive side, but it is not considered good practice.
The normal way is extend the negative battery line to wherever you have fitted the isolator switch, and then earth the switch to the chassis/body.
The remote relay is a good option, or you can control a suitably rated relay via a hidden switch somewhere.
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1988 Mercedes w124 superturbo diesel 508hp
1996 Mercedes s124 e300 diesel wagon
1990 BMW E30 V8 M60 powered!
1999 BMW E46 323ci project car
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andyborris
Posted a lot
Freedom is just another word for nothing left to lose.
Posts: 2,161
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Nothing to add to the thread, but this is a very smart boot, wish the cabin of my car looked this tidy! |
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shin2chin
Part of things
Making curse word cars slightly better
Posts: 820 
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If you are going to be using it every time you leave the car I would give the plastic key cuttoffs a miss and get a slightly dearer one with a metal key. I 1st fitted a plastic one to my landie and it wore out in a matter of weeks.
The metal replacement I fitted lasted years until I sold it. I had mine fitted to the -neg side too, less chance of sparks etc as has been said before.
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1977 PORSCHE 2.0na 924
1974 VW Beetle 1600
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tristanh
Part of things
Routinely bewildered
Posts: 990
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As above. Most of the cheaper Red Plastic key ones are rubbish. I've seen loads of rally cars act up as a result of them giving trouble.
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Whether you believe you can, or you cannot, you're probably right.
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93fxdl
Posted a lot
Enter your message here...
Posts: 2,000
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An extra i fitted to my battery isolator was a 10 amp fuse across the terminals to keep things like alarm,radio memory, clock etc working but any big drain would pop the fuse.
Ttfn Glenn
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On my Rover P5B, the battery is also in the boot and i bought a RC remote battery main switch which i fitted on the battery in the boot so i can switch it on and off with a fob. Being in the boot it is not so easy to get to by thieves Its the small black box with the yellow knob Peter Is that a battery brain you are using? So will also auto disconnect if the battery gets below a certain level? |
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Yes, it is battery drain combined with a RC remote switch
Peter
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