Starter cranked when jump starting? - BMW Luxury Touring Community
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post #1 of 4 Old Nov 28th, 2006, 11:41 am Thread Starter
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Starter cranked when jump starting?

The other day I inadvertantly turned the ingition key on my LT to the position where my parking lights were left on all day. Needless to say, when I went to start the bike, the battery was dead enough that it wouldn't start the bike. I called a friend of mine who had a battery jumper pack, and when we put the cables on the battery, the starter immediately began to crank, even though the key was in the off position. Of course I immediately turned the key on, and the bike started right up. However, all of my lights were out, including the head lights, the tail lights, the dash lights, my moto lights, and even the turn signals wouldn't work. Thinking I had somehow put too much juice to the system, I checked the fuses, but they appeared to be fine. The bike was idling this entire time, but still no lights. In the process of giving the bike some throttle, I accidently hit the starter button, and immediately the lights came on!!! They seem to be working fine, but I am more than a bit confused about it all. I have no idea why the starter would crank under those condition, or why no lights until I accidently touched the starter. Has anything similar ever happened to anyone, or does anyone have an explanation? After this, I certainly am going to think twice about jump starting the bike. jrlakin
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post #2 of 4 Old Nov 28th, 2006, 11:51 am
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Jumping the bike with the "battery jumper pack" obviously doesn't have enough amps to 'unstick' the starter relay. If you jump the LT with your car, you'll be fine. Just remember to be careful when connecting the positive cable. The frame is very close. You don't want to short that out. Just don't worry about hurting anything by jumping a bike with a car.
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post #3 of 4 Old Nov 28th, 2006, 12:06 pm
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stuck starter relay

Sounds like you had the classic stuck starter relay problem and unstuck it before you knew what you had. Search "stuck starter relay" on this site for lots of threads on the subject.
What happens: on earlier models of the LT when attempting to start with a very low battery the relay contacts will weld closed. This causes the bike to crank when a new battery is installed regardless of key position.
There are techniques for unsticking the relay, and there is an upgraded starter relay provided by BMW to prevent this problem.
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post #4 of 4 Old Nov 28th, 2006, 1:08 pm Thread Starter
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Somehow I knew people on this site would know the answer to this. Thanks. jrlakin
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