Author Topic: 80’ cb650c BARELY charging  (Read 308 times)

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Offline Easyskankin

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80’ cb650c BARELY charging
« on: May 24, 2019, 08:58:42 am »
My 1980 cb650 is barely charging. New rotor just installed. Reg/rec works battery fine. I’ve checked resistance in the key switch and fuse channels all normal. Wiring is solid. V drop tests are normal. Hoping someone can point me in another direction. Thanks, respect.

Offline calj737

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Re: 80’ cb650c BARELY charging
« Reply #1 on: May 24, 2019, 10:08:27 am »
Explain how you determined the Reg/Rec "works" and that the "battery is fine"...

Because something obviously isn't "working" or "fine"  ;)
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Offline Easyskankin

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Re: 80’ cb650c BARELY charging
« Reply #2 on: May 24, 2019, 10:19:01 am »
Right, I checked resistance in the reg and it checks out fine also it’s not overcharging. I can’t get it over 12.5 V and that is at 5k rpm and above. The battery holds charge at over 12V. Maybe they’re aren’t fine what are you thinking?

Offline calj737

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Re: 80’ cb650c BARELY charging
« Reply #3 on: May 24, 2019, 03:35:18 pm »
I'm thinking you need to start with the battery.

Charge the battery fully with a separate charger. Let it rest 2 hours, then measure the voltage across the terminals directly with a meter. What is it? It should be at least 12.6v for a lead acid, uptimes to 13.2v for a lithium.

If the battery checks out, then it's time to test the Reg/Rec and Stator. But start with the battery because any tests performed with a suspect battery are unreliable.
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Offline Easyskankin

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Re: 80’ cb650c BARELY charging
« Reply #4 on: May 24, 2019, 04:03:01 pm »
Charging now. Thank you for the time. Will report tomorrow