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alternator, charging problem, generator, small battery

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  #1  
Old 10th October 2011
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Default Alternator vs generator on small battery

77 Sportster xlh with kick and electric start.

Electrics: Headlight, tail light, points and speedo.

Battery: ES12BS AGM (really small: 3 7/16 wide, 6 long, 5 1/8 tall, no extra space for bigger battery).

Bike has been totally rewired so there is no wiring or electrical issue.

Battery not charging. Replaced generator and CE regulator twice, and battery many times.

I think the gen. is boiling the battery!

Is there a gen. or alt. that will not boil this small style battery? Or any other advice.
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  #2  
Old 10th October 2011
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Quote:
Originally Posted by tongues101 View Post
77 Sportster xlh with kick and electric start.

Electrics: Headlight, tail light, points and speedo.

Battery: ES12BS AGM (really small: 3 7/16 wide, 6 long, 5 1/8 tall, no extra space for bigger battery).

Bike has been totally rewired so there is no wiring or electrical issue.

Battery not charging. Replaced generator and CE regulator twice, and battery many times.

I think the gen. is boiling the battery!

Is there a gen. or alt. that will not boil this small style battery? Or any other advice.
If you have replaced the gen and reg, and bat a few times and keep having issues, are you sure the wiring is good? Just because it is new...... I would disconnect the battery and run a few continuity tests to make sure your wiring is good. Just my thoughts though.......
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Old 10th October 2011
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I think the small battery is being boiled by the generator, but not sure how to check this!
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Old 10th October 2011
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Quote:
Originally Posted by tongues101 View Post
I think the small battery is being boiled by the generator, but not sure how to check this!
I run a 7 amp hour battery on my XLCH, kick start only. A very small battery, and I do not have any issues with it being boiled over. The regulater is supposed to control how much power is generated or sent (not exactly sure) to the battery. If you have tried new generators, and new regulators and new batteries and still have issues, I would check the continuity of your wires to make sure you don't have a small short some where within your circuits. That might be sending a false signal from the battery to your regulator, or from the regulator to the generator, and causing it to keep charging your battery, making it boil over.
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Thanks. Will investigate further. That's probably what's going on.
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Old 10th October 2011
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Which CE regulator p/n did you replace? They make a low output regulator for small batteries.
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Old 11th October 2011
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you can use an inline dc amp meter or an inductive one to check it. the inline will be more accurate. this way, you can monitor the charge rate in amps. you can use a volt meter to watch the voltage. on startup, the amps will be higher and as the voltage comes up to charge level, the amps should drop. when the battery is charged, the system will operate off the generator or alternator and only take battery power when the cut in thresh hold is reached.
if this is a mechanical regulator, you might have to adjust the cut in and cut out settings, but if electronic, your hands are tied. make sure the regulator is sensing the battery and not a circuit with a load as the load in series will fool the regulator and it will try to bring the battery up. the battery should be ok with 14 to 15 volts but above that, the battery will suffer, ideally 14.2 volts is optimum. two failures seems to point to something ary in the wiring.
as for the electric foot, your battery might not have the cca and amp hours to fully satisfy its needs and will cause the battery to deep cycle. a lead acid battery does not like deep cycling and it will sulfate the plates. when this happens, the internal resistance rises and in order to bring the charge up, it will force more amps from the charging system which will cause battery heating and more damage.
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Old 11th October 2011
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the charging system doesn't care how big the battery is, as long as it's the correct voltage...... if the charging system is working correctly, running volts will be more than 13V and less than about 14.5V.....current (amps) will be higher when the battery is low and will go down to almost zero as the battery reaches fully charged.......check charging voltage (at about 2000RPM) if it's higher than 15 volts, the regulator is at fault......

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