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Hey Dave,

I got your messages, but I only have a chance to get online in the evenings. Anyway, I can't say I've heard of bikes draining the battery when the temp is over 248. More than likely you do have a bad component in the charging system that is being affected by the heat. Heat is the enemy of all electronics.

I am going to guess that your bad component has not completely failed but is causing the charging system to be inefficient when your bike is running hot. I'm also going to go out on a limb and say it is your voltage regulator. Of course, diagnostics over the internet are a shot in the dark at best :D Depending on the year of your bike, your voltage regulator may be built into the alternator and you may not be able to replace it without replacing the alternator. On some older bikes, you can get a replacement voltage regulator and solder it in. I'm not sure about the newer ones because I haven't seen too many of them fail.

The true joy of electrical problems is that they can be intermittent, mechanical failures tend to stay broken and are much easier to find. Your local shop should be able to do some basic tests to let you know if your bike is charging properly and, if it isn't, tell you what component is causing the problems.

Good luck, let us know how it goes.

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