kyrano
Registered user
Hi, Does anyone know where I can tap into a switched negative feed on a R1200GSA twin cam , as in ignition off = live, ignition on = not live 
Switched negative
- Thread starter kyrano
- Start date
Fanum
Toubab
Hi, Does anyone know where I can tap into a switched negative feed on a R1200GSA twin cam , as in ignition off = live, ignition on = not live
No, but if you can't find one, just use a switched positive and a relay to make one
kyrano
Registered user
Ok, I don't mind either way, where would be the best place to tap into a live feed with the ignition on....
Fanum
Toubab
I'm not a 1200 owner, so there may be a better place, but If I was fitting some lights to a 12 for someone and wanted a switched live, I'd go to the accessory socket and piggy back off that.
Or the provided as standard GPS power outlet (up near the headstock), depending on where you want to be in the bike with this power source.
kyrano
Registered user
Hi Farum, Thanks for the info here, this is my first BMW so I m not too sure where to tap for either pos or neg switched
I am intrigued why would you want a switched negative?
me too 
kyrano
Registered user
I can change to a switch live....if I know where to tap into
I would use a normally closed relay.
I.e. When there is no power the contacts allow power from the battery to the appliance.
http://www.amazon.co.uk/Durite-Relay-Mini-Normally-Closed/dp/B0085NBQJI
Just remember you might need some jump leads as well if you are using this to power something while the bike is off .....this is why the accessory sockets normally switch off when the engine is not running.
kyrano
Registered user
Hi Karlp, just what I am looking for cheers 
Hi
I assume you don't want to draw much current, otherwise your battery will die, so maybe the simplest thing is to connect from a switched positive, e.g the +ve side of the rear light, to he battery +ve.
When ignition on there will be no voltage between these points so your circuit will be off. When ignition off your circuit is powered from the battery to ground via the bulb.
I used to do this to power flashing LEDs when I used to think it made any difference to look like I had an alarm.
Darren
I assume you don't want to draw much current, otherwise your battery will die, so maybe the simplest thing is to connect from a switched positive, e.g the +ve side of the rear light, to he battery +ve.
When ignition on there will be no voltage between these points so your circuit will be off. When ignition off your circuit is powered from the battery to ground via the bulb.
I used to do this to power flashing LEDs when I used to think it made any difference to look like I had an alarm.
Darren
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