BMW K bikes (Bricks)

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1Back to top Go down    Battery isolation switch on Fri Jul 29, 2016 8:37 pm

pond snail

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Hello all,

I have a battery isolator switch to fit to my K75 basic, I think its rated at 300 amps, you turn a knob and a cam/spring allows the terminal connecting plate to lift away from the two terminals.

Its not too big, should be able to fit it somewhere around the right hand side of the battery area.

My question, I seem to recall reading somewhere, it was specific to K bikes, to isolate the negative battery terminal, would this be correct?,

Thanks in advance,

John

    

2Back to top Go down    Re: Battery isolation switch on Fri Jul 29, 2016 9:09 pm

RicK G

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It's not specific to Ks, you should always isolate the ground not the positive.


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"Every normal man must be tempted, at times, to spit upon his hands, hoist the black flag, and begin slitting throats." from Mencken's 1919 Prejudices

Bikes 1993 K1100 LT, 1998 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki X 2 for now
    

3Back to top Go down    Re: Battery isolation switch on Fri Jul 29, 2016 10:29 pm

duck

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And it will also cut power to the clock in the instrument cluster.


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Current stable:
86 Custom K100 (standard fairing, K75 Belly pan, Ceramic chromed engine covers, paralever)
K75 Frankenbrick (Paralever, K11 front end, hybrid ABS, K1100RS fairing, radial tires)
86 K75C Turbo w/ paralever
94 K1100RS
93 K1100LT (x2)
91 K1
93 K75S (K11 front end)
91 K75S (K1 front end)
14 Yamaha WR250R
http://www.ClassicKBikes.com
    

4Back to top Go down    Re: Battery isolation switch on Sat Jul 30, 2016 12:11 am

Crazy Frog

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@duck wrote:And it will also cut power to the clock in the instrument cluster.
You are right duck.

I have a similar switch on my bikes (only rated for 30 amps and installed on the ground) and the clock is the most annoying problem.


If this annoys you too much, you could always run a separate wire in the instrument cluster and permanently ground your clock directly to the negative of the battery.
Warning:
If you go this route, you must cut the original common ground wire/trace going the clock otherwise if you start the bike with the additional ground switch turned off, all the powered equipment will get the ground from the instrument cluster/clock and you may see the speedo and indicating 800km/h. You will have to call the


The ability to switch the ground off has a big advantage that if you ever have a welded starter relay you will be able to turn the power off.


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1986 k75, 1985 K100rt, 1985 K100rt/EML sidecar.
    

5Back to top Go down    Re: Battery isolation switch on Wed Aug 03, 2016 7:58 pm

pond snail

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Thank you for the replies,

I did think about the clock, very good advice on the separate earthing for the clock!!, for now I will just re adjust each time and see how that goes once I have the K75 back on the road, am nearly there!....

The switch is rated at 300 amps, which does seem a bit extreme, but hopefully will be well up to the job, the possibility of a welded starter relay is the main factor for fitting the battery isolation switch.

Its the smallest switch I could find, here is an ebay link, in case anyone is interested,

http://www.ebay.co.uk/itm/300A-Battery-Isolator-Disconnect-Power-Cut-Off-Kill-Switch-Boat-Car-Van-Truck-/311478926947?hash=item4885973e63:g:BkAAAOSwT5tWOlOz

Fits in nicely on the right hand side, just in front of the radiator expansion tank, will post a photo when its installed.

John



Last edited by pond snail on Wed Aug 03, 2016 8:02 pm; edited 1 time in total (Reason for editing : Added information)

    

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