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Danie, based on your past posts, you have a 2003 LT. Those were built with a low voltage cut out to protect the starter relay from over current and fusing. If you have not done any maintenance where wires or battery was removed, I would immediately suspect the battery. List your battery type and age. Have it tested. If you have done maintenance, please tell us what you did.

Also, make sure you are in neutral with the side stand up and the kill switch is in the center just to check all the bases.

EDIT:
Also make sure your reverse selector is in the right position.
 
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Wrencher Extraordinaire
2005 K1200LT
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1. Does the headlight go out when you press the starter button?

If not then you are missing the connection from the starter relay to the starter.

If it does go out that connection is good but you may be on a bad spot on the starter commutator. Put the bike in 5th gear and with the clutch let out rock the bike backwards several times. Roll forward against the drive line slack and then bounce backwards hard. This will move the engine backwards and will also engage the sprag clutch and spin the starter a bit. This may move it enough to catch on the next start attempt.
 

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Mine suddenly stopped working, replaced the battery about 3 months ago. It's on the center stand with side stand up. Lights come on, but starter does nothing, no clicking sound, lights dimming. Could it be a fuze?
 

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Wrencher Extraordinaire
2005 K1200LT
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No fuse. The most common fault is the 5 mm Allen screw that grounds the starter. It is a bit hard to see. Your 2003 should have the voltage sensitive starter relay that will not allow starting if the, key on, battery voltage is below 11.8 volts. You said new battery but if the bike has sat for a while the battery could be low. Check it with a good multimeter (or a cheap one from Harbor Freight). Key off you want to see 12.5 to 12.7 volts, when the key is turned on it should drop no lower than 12.2.

That 5 mm Allen: Circled in red on picture 2.

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