Battery problem - Star Motorcycle Forums: Star Raider, V-Max, V-Star, Road-Star Forum
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post #1 of 29 (permalink) Old 02-07-2018, 11:41 AM Thread Starter
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Battery problem

So my battery is bulging. What in the world? I will try to post some pictures of it.
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post #2 of 29 (permalink) Old 02-07-2018, 11:47 AM
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It looks like the battery was overheating. i would have it tested, and also check the charging system to be sure it is not overcharging.
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post #3 of 29 (permalink) Old 02-07-2018, 11:53 AM
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It will do that if you over charge it, with a shop charger or if your bike charging system has a failed regulator.

It will also do that if the battery was nearly dead, and it froze. A charged battery is filled with acid and will not freeze. A dead battery is mostly water.

Either way, that battery is spent.

If your bike charging system has a failed regulator the only indication you might see is the headlight will be really bright, because it can run well over 15V.

If the regulator is bad you do not want to run your engine - other electronic modules could be destroyed by the higher voltage.

Last edited by KCW; 02-07-2018 at 11:55 AM.
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post #4 of 29 (permalink) Old 02-07-2018, 11:57 AM
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When the voltage regulator starts to fail it will over charge the electical system. Follow link to test.

https://sites.google.com/site/vstar1...harging-system

Mine went out a few years ago. From experience it will start blowing lights and switches. Use Yamaha replacement, the cheaper after market ones have a reputation of not lasting. And yes you will need to replace the battery.

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post #5 of 29 (permalink) Old 02-07-2018, 01:18 PM Thread Starter
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Thank you all for your valuable information. I am getting a new battery tonight. However, I don't want to mess up my new battery, so can I test this regulator thingy with my old battery by just jumping the motorcycle? I am not too mechanically inclined, but how hard is it to replace the regulator?
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post #6 of 29 (permalink) Old 02-07-2018, 03:05 PM
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You'll need a volt meter. Start the bike and measure it across the battery. If it's more than 13 or 14 volts your voltage regulator/rectifier is bad. If it's an 1100 it's a known issue. Don't let it run any longer than necessary to test it if the voltage is too high or it'll destroy your new battery. And les is right - don't waste your money on a Chinese regulator from eBay. Get OEM.

The regulator isn't hard to replace. Assuming you have an 1100, it's behind the chrome plastic cover that's under the battery. You'll probably have to remove the exhaust to get to it, then take the cover off. Only a couple of bolts hold the regulator on. Unplug it and install the new one.
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post #7 of 29 (permalink) Old 02-07-2018, 07:45 PM
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Quote:
Originally Posted by NorthernRider View Post
The regulator isn't hard to replace. Assuming you have an 1100, it's behind the chrome plastic cover that's under the battery. You'll probably have to remove the exhaust to get to it, then take the cover off. Only a couple of bolts hold the regulator on. Unplug it and install the new one.
Generally true, but the screw and clip were rusted together on mine which made getting the regulator out a little more difficult for me. By the way, mine went bad at 11K miles and the replacement at about 48K miles. Bike is on it's third one.

See picture below of clip. This slips over a piece of plastic to support the regulator.
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post #8 of 29 (permalink) Old 02-07-2018, 10:29 PM
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Motorcycle batteries are small. Most of the ones I have seen were not sealed. My battery is not sealed and I check the liquid level every once in a while. If the level gets a bit low, I add distilled water or deionized water and then charge the battery with an intelligent battery charger.

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post #9 of 29 (permalink) Old 02-07-2018, 11:19 PM Thread Starter
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So I checked the battery no load, 12-12.4 on the multi-meter. I checked it with the engine running 13.8-13.9. Under the 14 mark, so can I rule out the regulator or is it an intermittent thing? Oh, I took it to teh motorcycle shop around the corner and their fancy meter said the battery was bad, which we knew, but the regulator was putting out 14 volts.

Last edited by fd757; 03-29-2018 at 05:15 PM.
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post #10 of 29 (permalink) Old 02-08-2018, 07:50 AM
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14 amps is perfect. Batteries in vehicles are not charged by amperage but by voltage.

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