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charging issues

15764 Views 11 Replies 6 Participants Last post by  idiggplants
hello everyone! first post here! so glad i found this site because im stumped!

so i was out riding this past weekend with a bunch of friends, and left my hardwired gps on between rides. the battery seemed to be doing fine, but one time, after starting it with the easy button, i was driving, and all of a sudden my headlights dimmed. when i eventually came to a stop and put it in neutral, i noticed the following:

1. when i rev the engine, both the stock headlights, and the neutral light dim. but when i let it idle, and almost die, they get real bright.

2. i have a pair of headlights mounted to my handlebars which are directly wired to the battery(inline fuse). these do not dim or brighten regardless of the rev's.

3. at the battery i show 12.8 volts when off, as well as when on.

4. when it is off, the neutral light and stock headlights do not turn on.

5. when it is off, the direct wired headlights turn on and are as bright as ever.

i have a clymer manual on the way but i was hoping you guys would be able to suggest if its the stator, rectifier, battery, etc, or tell me some tests that i could do to find out for myself.

i really appreciate any help i can get from you guys, and hopefully i posted this in the correct place!

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I am not a bike mechanic, but I've got a background in electronics, so I will make an educated guess.

It's definitely not the battery. It's more than likely the alternator or the stator or what ever it is on a bike that creates the juice. It might also be something in the charge circuit, but I'll have to look at my service manual schematic to see what is in there.

Little help, I know. But, the fact that the lights are dim UNTIL the engine almost dies, tells me when the engine is off or about to die the lights are getting the juice from the battery, so it aint the battery. When the engine is running, the voltage on the battery doesn't change, so it's not being charged. And, when the engine is running the lights dim, so something in the circuitry is not allowing power from the battery to the lights...and that might be by design because the battery shouldn't be in use when the bike is running, so that makes sense.
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It's certainly possible, and one might be able to help diagnose the problem by disconnecting all the aftermarket stuff and then troubleshoot it from there.

If it's not charging the battery, then eventually the battery is going to die, duh, but why hasn't that happened yet...when it appears the battery isn't getting charged if the voltage doesn't increase while running.

Without my morning coffee yet, I would say you should avoid running everything together. If you leave your aftermarket stuff on all the time, then just leave the stock headlight off unless you need it while riding. Seems to be the easiest solution. Might also be a good idea to get a bigger battery.
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