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Question about Battery charging

  • Thread starter Thread starter Anonymous
  • Start date Start date
A

Anonymous

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I got my bike 3 weeks ago. Starts fine. I hooked up a multimeter to it and it shows about 11.7 when the bike is not running and 13.6 when brought to 2000rpms( I do not know how old the battery is). I just hooked it up to a 1amp trickle charger. How long should I keep it on, and what reading should I get? The acid levels are full.

Brian
81 GS650G
 
briang1 said:
I only did it to 4000 once. It read around 13.9-14
Click to expand...

Those are good numbers. It is fine. Are you having problems keeping the battery charged?

Hap
 
No, but I thought the battery should be at 12.6 when not running and 14.4 when rev up????
 
I just rev it up to 4500 rpm it is charging at a rate of 13.08. Is that still within the limits?
 
briang1 said:
I just rev it up to 4500 rpm it is charging at a rate of 13.08. Is that still within the limits?
Click to expand...

You are getting 14V at 4000 rpm and 13.08 at 4500? That does not sound right...something is wrong. You need to pull the three stator wires, put your meter on AC volts in the 120V scale and measure the voltage between each of the three wires... if the wires were lettered A, B, and C, you would measure the voltage between A and B, B and C, and A and C. You should get around 80V on each measurement. If not, turn the motorcycle off and turn your meter to the ohm scale and measure the resistance between each wire..if you get infinity anywhere then you have an open coil in the stator.

If you end up with 80 Volts between all three wires then your rectifier/regulator is probably bad.

Hap
 
ADD a extra ground wire to the reg mounting bolt to the (-) battery terminal This improves the reg ground and reg life.
 
I think I had confused, I thought it was charging at 13.9, but anywhere between 4000-5000 rpm it is charging at 13.09. It did not drop from 13.9 to 13.09, I just read the meter wrong, sorry. Is 13.09 OK??????
 
briang1 said:
I think I had confused, I thought it was charging at 13.9, but anywhere between 4000-5000 rpm it is charging at 13.09. It did not drop from 13.9 to 13.09, I just read the meter wrong, sorry. Is 13.09 OK??????
Click to expand...

No that is definately too low. Take Lynn's advice, add a ground, and check all your other grounds and make sure they are clean and making good contact. If you still have a charging level below about 13.8 @ 4000 rpm (and that is a little low) you need to trouble shoot the stator like I mentioned earlier.

Hap
 
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