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Discussion Starter #1
This seems odd. After returning to my bike this afternoon, I noticed that the right hand grip was hot. I have noticed this before, but attributed it to parking in the sun!

I used the heated hand grips this morning (it was 55 degrees!) and forgot to turn the switch off after I removed the key. Normally I'll turn off the switch so that it is not on when I start up the bike.

Five hours later when I returned to the bike I noticed that the right grip was hot and not the left. The switch was in the first on position, but I had removed the key. The seat was switched on, but not hot. I had forgotten to switch them both off.

It seems like the right heated grip is staying on when switch on and that's with the key removed, but not the left grip. I was lucky that my battery has been on a charger and was not drained by the 5 hours of current loss.
 

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Wrencher Extraordinaire
2005 K1200LT
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13,909 Posts
Dan,


Diagram shows that is powered from a switched source though fuse F6. Odd that only one was hot with the key off. may try pulling that fuse and see what happens next. Also noticed that the only difference between high and low is the diameter of the wire that feeds the grips. Low is 0.35mm and high is 0.5 mm.

The cause could be a ground loop from something else that is missing its ground and is feeding back through the right gip. A pinched wire could cause this.
 

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313 Posts
Dan, mine acted similarly last winter. It was caused by the common wire (ground) bundle behind the headlight, that had short circuited and melted to an always hot wire. I think it was feeding power backwards through the ground wire to the grip.
I hope you don't have the same problem. Using a multimeter and with the fuse pulled, I started searching at the handgrips and traced the wires, disconnecting them to isolate the circuit whenever I could. The multimeter was set in ohms resistance or continuity mode. The disconnects are 1) at the fork bridge, 2) on upper left side of left fork 3) behind the headlight between the forks. I had my gas tank off, but I don't remember if it had to be off for connectors 1&2.
If you end up going this route, let me know and I'll try to get you more info.
 

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Discussion Starter #4
John and Tom, Thanks...

I check out the circuits tomorrow. I don't think it's a big deal on the surface, but it could lead to a larger problem if a hot wire has shorted out.. I just have to remember to turn off the heated grip and not rely on the key. Don't use the heated grips much in FL, but when needed they are nice.
 

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DanDiver said:
... Don't use the heated grips much in FL, but when needed they are nice...
Dan, that's what I thought when I first moved from PA to FL about two years ago. Used them (and heated seat) a lot up in PA but sunny and warm FL?

Since I leave for work before the sun comes up, and I found that winter months in FL can sometimes get 'cool' at night, I still LOVE heated grips and seat! :D

Jon
 

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Discussion Starter #6
Jon,

When I first looked at this motorcycle I thought that the electric windshield, heated seat, heated handgrips and cruse control were way over the top and that I'd probably never use any of them.

WRONG!!! I use them all, all the time... At least in the winter. Electric windshield, all the time. Cruse control, whenever on the highway for more than an hour.... They quickly went from an occasional luxury to a necessity that I use to measure all bikes.

Time for the party - Happy New Year everyone...... Looking forward to 2011....... Yahooooooo
 

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DanDiver said:
Like you know Im new to BMW but I know a little about electrical. Guess I need to get a wiring diagram for any future problems I might have.
Are most of the accessories controlled by relays? Could be stuck relay, bad ground or stray voltage from a shorted wire. Who makes a good service manual for the LT?
 

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Discussion Starter #11
Nope, not yet.... Sort of hoping it willl fix it's self! Ha... It seems to be intermittent so eventually I'll have to do some digging. One of these day.......
 

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I'm ass deep in mine now, and might be able to help with pictures of the connections if you want. Took me a while to find them all, but now that I have, no sense in you having to go digging around too.

Looking at the schematic, it doesn't make sense that one would work, and the other not - at least at the same time. Does the left side work at all?
 
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