Permanent 12v source?

[Greggers]

Holaaaaa again!

Ok, you want to take a live 12v supply, but if you interrupt the battery connection you'll get the 'service' indicator come up on the OBC - nobody wants that little nag do they?

Here's the answer:


Whip off the LH 'tank' cover and you'll see the starter solenoid mounted to the frame just above the top corner of the radiator. There are two terminals and a plug on it - the plug bit is the solenoid trigger from the starter switch, and the bolted terminals are the high current feeds to the starter motor. The thick red cable is permanently live, the thick black cable is the supply to the starter motor which is only live when the solenoid is triggered. In the pic my cable is the thinner red one on the right, the thick one on the left is the live from the battery.

As the main wiring harness is connected to the +ve terminal of the battery from one connector you can't disconnect that without discoinnecting the OBC - but the solenoid supply is down-line from that and disconnecting it won't disturb the OBC ...

If you do this, don't forget to fit an in-line fuse holder to protect whatever you're driving from it as it's not protected by the CanBus ...

G

 

[Malcolm Leick]

I manged to slip another ring connector onto the batery terminal without losing power to the OBC just by holding everything down. I have an inline fuse, but I'm not sure if it's the right rating. The auxillairy lamps are 0.75amps and can go from 9 to 50V. What would you recommend? I have a 5amp blade fuse in at the mo which was the lowest that Maplins had.

 

[mark71]

Guys

You can disconnect the battery and you wont get a service indicator so dont worry about that as its just scare mongering that has been put out so just undo it and put a terminal onto the battery.

Hope this helps

Regards

Mark

 

[rce]

+1 what Mark said.

It would take several hours (maybe even days) before the internal rechargeable clock ran out of power.

 

[Greggers]

Malcolm - agreed, but it can get to be a bit of a juggling exercise if you end up with more than one... You're fitting those LED lights aren't you ?? LEDs don't draw too much current, and from your other post you've said these need .75A so you'll need a 1A fuse. Pop down to your local garage - you'll probably find a mixed pack will have a 1A fuse and will cost you less than a quid...

As far as the other comments from Mark and RCE are concerned - I'm not going to argue the point with you, but there are plenty who'd disagree with you on the basis of their own personal experience...

I guess if you feel lucky then go ahead - if disconnecting it does activate the service indicator and you're on good terms with your dealer (or are fortunate enough to own, or know someone with a GS911) then it's only about £20-30.00 to get it re-set.

All the best

Greg

 

[v8legend]

Guys

You can disconnect the battery and you wont get a service indicator so dont worry about that as its just scare mongering that has been put out so just undo it and put a terminal onto the battery.

Mark

Your right, it shouldn't. But it sometimes does!

It did it to mine after I'd fitted my GPS. I took it back to the dealer and they reset for free. IMHO it's not worth the risk.

 

[Honyam]

Battery disconnected and service light came straight on 2009 model

 

[(RIP) Ewan]

Yes it does...

...sometimes anyway, even though it shouldn't. I have an 800 and my wife had one also until recently, and on a number of occasions the service light came on after a short disconnect, for example when fitting spots.

Fortunately with 2 BMs in the garage we have a GS911 tool so could reset no problem, but otherwise heed the wise words of Greggers!

 

[EmmettC]

Battery disconnected and service light came straight on 2009 model

I agrozzle, happened to me both times I did it.

 

[Malcolm Leick]

Ditto when I fitted terminals for heated jacket. I just left it until my next service was due.