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Author Topic: alternator not charging?  (Read 1257 times)

Offline Bill Conquest

  • Lives in Foothills of Mt. Olympus
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alternator not charging?
« on: February 27, 2011, 03:11:11 PM »
Can anyone remind me of what the proper charge should be coming out of the alternator when running?I plan to check the brushes and am wondering if there's anything I should watch for..Thanks in advace.. (i'm getting 12.4 volts give or take a little,at 3000 rpm)
Bill Conquest
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79 r65/75 r60/76r75/76r100

Offline Barry

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Re: alternator not charging?
« Reply #1 on: February 27, 2011, 04:02:26 PM »
Voltage regulators are nominally 14 Volts and you should ideally measure something in the range 13.8 - 14.2 volts with an absolute min of 13.5. At the other extreme 14.5 volts would be OK for a gel battery. The test should be done at the battery terminals and with a fully charged battery and also with no additional electrical load. 12.4 volts is much too low and would not bring a battery above 75% charge.
« Last Edit: February 27, 2011, 04:20:36 PM by bhodgson »
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Barry Cheshire, England 79 R45

tvrla

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Re: alternator not charging?
« Reply #2 on: February 27, 2011, 06:51:05 PM »
Barry nailed it.

I doubt your brushes are to blame for the low voltage. Is the charge light staying on or glowing dimly?
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Offline Bill Conquest

  • Lives in Foothills of Mt. Olympus
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Re: alternator not charging?
« Reply #3 on: March 01, 2011, 11:50:01 PM »
I have an odysee 680 battery that seems to be o.k. - yes, the charge light is  glowing when I ride..what else should I be looking at if not the brushes? Thanks for the info.!
Bill Conquest
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79 r65/75 r60/76r75/76r100

benlawlor85

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Re: alternator not charging?
« Reply #4 on: March 02, 2011, 02:31:39 AM »
When i had problems with electrical system i found that the brushes were fine but that the springs had lost their spring and thus were not pushing the brushes hard enough! only a couple of pence to replace if i remember. worth a try.
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Offline Bill Conquest

  • Lives in Foothills of Mt. Olympus
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Re: alternator not charging?
« Reply #5 on: March 03, 2011, 12:05:37 AM »
Thanks, Ben i'll check that.. hope it's something that easy!
Bill Conquest
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79 r65/75 r60/76r75/76r100

BMWcyc

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Re: alternator not charging?
« Reply #6 on: March 04, 2011, 02:19:54 PM »
If the current investigation doesn't completely solve.....

I wasn't getting any charge on mine...fast track to a dead battery!    Ended up being a small break somewhere in the Rotor wiring that could not be found...replaced rotor with a re-build that was done very well ...  problem completely solved.
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Offline Rob Valdez 79 R65

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Re: alternator not charging?
« Reply #7 on: March 04, 2011, 05:53:59 PM »
Quote
If the current investigation doesn't completely solve.....

I wasn't getting any charge on mine...fast track to a dead battery!    Ended up being a small break somewhere in the Rotor wiring that could not be found...replaced rotor with a re-build that was done very well ...  problem completely solved.
Sometimes those rotor "opens" don't show up until the rotor is spinning.  At rest, with a ohm meter on them, they look fine.
I think it was someone on here that had this experience.
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