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Charging system

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Charging system

Esawers
Hey there guys just joined the forum! Glad to be here! I have a few questions on my 1979 Honda cb750k.... so at idle the bike will lose battery voltage but very slowly yet when I hit the throttle I see a spike in voltage. Problem is it doesn't go anywhere near the spec 14v. It will rise to about 12.3 and this is with a freshly charged new batterty. My thoughts are rotor? I've checked the stator and brushes but not my r/r. Could r/r cause this problem or more rotor related? Any help appreciated! Thanks!
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Re: Charging system

TOOLS1
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Sounds like the reg/rec since it is charging some. When the rotor goes bad, they usually do not charge at all.
TOOLS
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1976 CB 750-A X 2
1977 CB 750-A X 4
1977 CB 750-K
1976 CB 750 F
1981 CB 750
1966 Kawasaki SG 250
1981 KZ 750 LTD
1973 CB 350
1979 CM 185 Twinstar
1982 Honda XL 80
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Re: Charging system

Esawers
Rotor is testing at 3.4 on the slip rings so I don't know if I should start there or not
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Re: Charging system

Truck
Before buying anything get some contact cleaner and a brush and clean all of your connections. I had a similar problem with my 900 and all it was was dirty/aged connectors.
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95% of Harley Davidsons ever made are still on the road... The other 5% made it home.

New Baltimore, Va '82 CB900c, 1980 CB985F/K 'Mutt"
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Re: Charging system

Esawers
Yeah that's a good idea... the guy I bought it from said he rewired everything and it all looks good but one can never be sure with these bikes it seems
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