BMW K bikes (Bricks)

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1Back to top Go down   Battery Charging Empty Battery Charging on Thu Nov 12, 2015 6:07 am

Grahame

Grahame
active member
active member
I've just bought a plug that fits my K75 power socket and I was wondering if I could connect the plug to my battery charger and plug it into the bike socket instead of clipping the crocodile clips onto the battery terminals.
There were no wiring instructions with the plug but I'm assuming that the central pin is the live connection.
Can anyone advise?


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K75RT ABS Mystic Red 1995 7th owner
Engine No.753EA 0294
Chassis No. 03706294134
Mileage 24/12/18  40,399
    

2Back to top Go down   Battery Charging Empty Re: Battery Charging on Thu Nov 12, 2015 6:15 am

1990k75

1990k75
Silver member
Silver member
That's what I've been doing for years, just upgraded to a 750ma 'Genius' charger that has multi-mode charging & can be left plugged in all winter (which is farkling long here)   Rolling Eyes

On the plug I got (from BMW) the leads were red/black - kinda obvious... if yours isn't colour coded just plug it in & put a meter on it...   cheers

Lorne

    

3Back to top Go down   Battery Charging Empty Re: Battery Charging on Thu Nov 12, 2015 11:30 am

kioolt

kioolt
Silver member
Silver member
The center terminal is the plus terminal.


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2004 R1150RT 186,800 miles 
1991 K100LT 128,700 miles
1982 R100RT 106,900 miles
Total 422,400 BMW miles

AMA,BMWRA,BMWMOA


The cheapest thing on a BMW is the nut that connects the handlebars to the seat.
    

4Back to top Go down   Battery Charging Empty Re: Battery Charging on Thu Nov 12, 2015 11:59 am

Two Wheels Better

Two Wheels Better
Moderator
Moderator
Yes, the centre tip is positive. Most chargers nowadays are polarity protected. That means any dummy can pop the wrong clips onto the terminal posts and they won't get a light and spark show - because there has to be enough 'juice' left in the battery for the charger to 'recognise' the battery is whatever fraction of 12 volts is required to induce a charge. But it also means that if a battery is low enough to not accept a charge, none will be forthcoming.

I also use a Genuis brand charger (the G1100 baby one) and it works a treat. Battery Tender brand, which have been the cause of many an overcharged (dried out done for dead) battery at Winter's end, are now equipped with a 72 or 80 hour automatic shut off circuit. It took yonks, but they've acknowledged the problem.


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1977 R75/7-R100 grey, '87 K100RS red, '93 K11-K12 aka 'Big Block' black, '96 K1100RS black, '98 K1200RS red, '09 K1300GT red, & 2013 R1200RT-Polizia black & white.

    

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