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"K12GT" Technical Q&A K1200GT-'NG'- Technical Questions/Answers

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  #1  
Old 11-12-2018, 09:59 PM
Brico Brico is offline
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Additional wring harness for starter/alternator??

I have, as some other people as well, experienced the issue with the bike being unable to start when stopped after a spirited ride and the bike heated up. The only solution to this is to await for it to cool down a little (sometimes as long as 15 minutes) before trying to start the bike.

I am going through my BMW repair Manual on a CD and noted one particular job/repair that attracted my attention.

It is 61 11 003 / 61 11 542 Installing additional wiring harness, starter/alternator...

I believe I've read somewhere on the forum that the issue with the "hot start" condition is solved by adding /enlarging the starter positive wire in order to allow more current to flow onto it when the bike is hot.

Is this the repair/job that will hopefully solve the problem with the "hot start"? I would hate to go and buy a new starter (that I am contemplating) and replace it to find out the problem is with the inadequate wiring rather than with the starter itself.

Any leads on this would be much appreciated.
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Old 11-13-2018, 01:24 AM
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Re: Additional wring harness for starter/alternator??

Yes there is a wire harness you can buy from BMW for about $150. It works for the hot start issue. I have installed it and all is good now. Here is the thread you are looking for. Take your time as it is not easy to install, thick wires to mold to routes and you need to carefully route it for a clean job. Also remover your air box to do a good job. That is work in itself. Do not let it rub on any throttle body linkage. Don't stress anything. Dealers hated doing this on warranty as BMW gave them 2 hrs pay for a 4 hour job. You need to remove the gas tank and air box to get at everything.

http://www.i-bmw.com/showthread.php?...ight=hot+start


While you are in there, pull your starter, take it apart and clean the dust out then lube the needed parts.
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Old 11-13-2018, 01:40 AM
Brico Brico is offline
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Re: Additional wring harness for starter/alternator??

Thanks Beech,

I just removed the side panels and gas tank and will remove the starter tomorrow and check with BMW what is the price for the new wiring harness. I guess it is pretty much doubling the wires, isn't it?

I will be removing my air box as well as I also have that issue with hunting RPMs when bike is warm. Not as bad as I've seen others describe it, but today riding in Vancouver at 45 degrees when stopped at the traffic light my idle would always go up to 1500-1750 RPM and remain there. In Summer it was worse with idle RPM remaining at >2500 rpm and a bit awkward to ride in the city stop and go traffic.

Similarly to hot start it only happens when the bike is hot after running for a while.

I may have to replace the air box as I've seen people saying that replacing it with new one sorted out the hunting rpm/sticky throttle problem.
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Old 11-13-2018, 01:47 AM
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Re: Additional wring harness for starter/alternator??

A quick guess is that your idle air valve is binding up with the heat or the air box is. If you have the newest air box, then time to clean or replace the idle air valve. Just went back, I see you have a GT. The most common bike to have this idle problem. There is software that goes with the air box up grade, talk to your dealer. If the air box was up graded at a shop their computer will show it. All this happened about October 2008. You can look up current part numbers on:
https://shop.maxbmw.com/fiche/PartsFiche.aspx

And find a picture of that pesky idle air valve.
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Old 11-13-2018, 10:18 AM
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Re: Additional wring harness for starter/alternator??

Quote:
Originally Posted by Brico
Thanks Beech, I guess it is pretty much doubling the wires, isn't it?

The new harness piggy-backs from battery to alternator, but replaces original leads to starter motor and to relay. So the original starter and relay leads become redundant.

My 2014 K13S MS had this done under warranty recently, but the dealer managed to mess up the job and leave me with a 'clicking' relay, and no starter . . still, I got a new battery out of it, as a bad battery was their original prognosis.

Good luck with the fix. Any more problems and it could well be the starter switch internals expanding in the heat.
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