Fitting a Battery Isolator Switch to a 1984 K100Rs

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Richard(Sande)Sanders
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Fitting a Battery Isolator Switch to a 1984 K100Rs

Postby Richard(Sande)Sanders » Thu Jul 12, 2018 9:33 pm

Is there any reason why I can't fit a battery isolator switch to my 1984 K100RS. It is used mainly
in the winter (I don't do snow & ice on two wheels, & the K has a sidecar fitted), & for those times
when I need more luggage space than my R1100RT has. I am not worried about the clock, but I'm
not sure what else might be affected by long term lack of power.

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Re: Fitting a Battery Isolator Switch to a 1984 K100Rs

Postby boxerman » Thu Jul 12, 2018 10:30 pm

Shouldn't hurt at all tho it does add a weak link in the system.
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Richard(Sande)Sanders
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Re: Fitting a Battery Isolator Switch to a 1984 K100Rs

Postby Richard(Sande)Sanders » Fri Jul 13, 2018 7:27 pm

Thanks, it's just to save me from removing battery leads when the old girl
is sat in the garage between ( infrequent ) rides.

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Re: Fitting a Battery Isolator Switch to a 1984 K100Rs

Postby Galactic Greyhound » Fri Jul 13, 2018 7:52 pm

Just in case - Don't EVER operate the Battery Isolator Switch when the engine is running or there is a risk of a high Alternator/Regulator voltage getting onto the bike's power rail! :sad:
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Re: Fitting a Battery Isolator Switch to a 1984 K100Rs

Postby Richard(Sande)Sanders » Sat Jul 14, 2018 7:52 am

Just in case - Don't EVER operate the Battery Isolator Switch when the engine is running or there is a risk of a high Alternator/Regulator voltage getting onto the bike's power rail! :sad:
The switch will be under the seat or behind a side panel, so not easy to get
to, but easier than getting to the battery to take off the earth lead, plus no
tools needed & no screws/bolts to loose.

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Re: Fitting a Battery Isolator Switch to a 1984 K100Rs

Postby CaptAirhead » Sat Jul 14, 2018 10:08 am

This is the one I ordered, it screws directly onto the battery terminal. The Motobatt is a lot narrower than standard so plenty of room.

ImageBattery Isolator by Ian Beat, on Flickr

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Re: Fitting a Battery Isolator Switch to a 1984 K100Rs

Postby Jaythro » Sat Jul 14, 2018 3:35 pm

There is an Easier way .......

Just unscrew the M6 earth strap where it connects to the gearbox above the gearlever?? slip it in a bit of Garden Hose so it can't accidentally connect with the frame / gearbox
"Put your Ass on a motorcycle and ride with an attitude and the "Grim Reaper" will ride in your shadow!"

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Richard(Sande)Sanders
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Re: Fitting a Battery Isolator Switch to a 1984 K100Rs

Postby Richard(Sande)Sanders » Sat Jul 14, 2018 5:40 pm

I did think of that but it means leaning headfirst into the gap between the bike & sidecar, I
will probably fit a switch under the nearside side panel, easy to get to, but out of the way of
an accidental switch off while riding.

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Re: Fitting a Battery Isolator Switch to a 1984 K100Rs

Postby GeorgeH » Mon Aug 06, 2018 5:52 pm

Well, I have been very interested in this post as last week I had the very disturbing situation whereby I couldn't stop the starter motor of my 1988 K75S from spinning even with the ignition off! I didn't realise that there was any problem until I noticed that my indicators and horn were not working. When I got the bike back home with some very hot wiring, the only way that I could stop the starter motor was to disconnect the earth. I did a bit of a search and found that this is a known issue and probably welded contacts in the starter relay were the problem. I very carefully reconnected the earth wire and all seems OK (at present), I will fit a new relay but am a little concerned that the same thing could happen so I have installed an easily accessible in-line bullet connector into the earth cable, I appreciate that I may have created a "weak" point but would appreciate your thoughts.

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Re: Fitting a Battery Isolator Switch to a 1984 K100Rs

Postby Mike D » Mon Aug 06, 2018 6:12 pm

Yes a common fault on the K, usually brought about by trying to start the bike with a low battery. This causes arcing on the starter relay contacts because the relay is only slowly operating. After a short time the contacts weld together.

MIke

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Re: Fitting a Battery Isolator Switch to a 1984 K100Rs

Postby GeorgeH » Mon Aug 06, 2018 6:26 pm

Yep, I've read about the low battery scenario but in my case I had just returned from a 1000 mile trip around northern France and had fitted brand new battery just the week prior to that. Just one of those things do you think?

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Re: Fitting a Battery Isolator Switch to a 1984 K100Rs

Postby Mike D » Tue Aug 07, 2018 12:46 pm

Not knowing the history of the bike. it could have been a damaged relay from a previous poor start. Even with a good battery there could be a poor connection.

Mike


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