Vintage and Classic Hondas

No charge to the battery

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rij1

No charge to the battery

I'm having a problem finding the problem to why my battery wont charge in my bike. The bike idles and runs but the battery wont charge. If I charge the battery in the bike with a battery charger and start the bike and ride to work few times the bike wont start cause a dead battery. I had to push start it to get it running a few times. If I have a volt meter on the battery and the bike running there is no charge.

My Bike Information
1982 Honda DOHC CB750F Supersport
4-1 Exhaust with baffle
Stock intake air box
Slow-speed jet #35
Primary main jet #68
Secondary main jet #105
Ventura, California

TOOLS1

Re: No charge to the battery

Administrator

Hey, repairing charging problems is just part of the fun of owning a DOHC Honda. If you just use the search feature at the top right corner of the home page here, you will bring up a few hundred posts on trouble shooting, and repairing the DOHC charging system. However I will bet dollars to doughnuts that the rotor is bad.
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Life is not about the number of breaths, you take, but the moments that take your breath away.
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I just can't imagine what could go wrong.
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I like vintage bikes because they take me away from the clutter of technology that I work with everyday and back to a simpler time of mechanical elegance and simplicity.. "ninadm"
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"Fear nothing, attack everything" Eric Berry
" Oh, you read that on the internet? Clearly it IS a massive problem. Of course it CAN’t be normal operation."

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
South of Eden (Kansas City MO)

rij1

Re: No charge to the battery

yeah, I think it is. it looks worn out but the guy I bought it from said it was new, the stator looks to have a small worn spot also. Gonna have to replace.

My Bike Information
1982 Honda DOHC CB750F Supersport
4-1 Exhaust with baffle
Stock intake air box
Slow-speed jet #35
Primary main jet #68
Secondary main jet #105
Ventura, California

Johnnylevi

Re: No charge to the battery

In reply to this post by rij1

have you checked the brushes at all?

1981 SS with Kerker 4-1 exhaust and extremely attractive rider.

rij1

Re: No charge to the battery

This post was updated on .

In reply to this post by rij1

Here are pic's of the rotor, stator and brushes.

worn area on stator- Yellow wires read .9 Ohms and not grounded
Image Hosting by PictureTrail.com

Rotor-copper rings read 4. Ohms
Image Hosting by PictureTrail.com

Brushes

My Bike Information
1982 Honda DOHC CB750F Supersport
4-1 Exhaust with baffle
Stock intake air box
Slow-speed jet #35
Primary main jet #68
Secondary main jet #105
Ventura, California

Manual

Re: No charge to the battery

In reply to this post by rij1

Having been through the exact same thing, my money is on the regulator rectifier.

rij1

Re: No charge to the battery

I'll have to test that also. I forgot to mention that I only get 10.5v out of one of the wires off the stator while the bike is running.

My Bike Information
1982 Honda DOHC CB750F Supersport
4-1 Exhaust with baffle
Stock intake air box
Slow-speed jet #35
Primary main jet #68
Secondary main jet #105
Ventura, California

icerigger

Re: No charge to the battery

Check the resistance across the rings on the rotor. It should be between 4-6 ohms. Vibration wears the insulation off the windings and shorts them out. A nasty side effect is that they usually take the regulator out when they go.

Livin' my life like a song.

1985 Honda Rebel 250 - "Birdie"
1979 CB750K - "Behemoth"

rij1

Re: No charge to the battery

In reply to this post by rij1

It was the regulator rectifier. Whats weird is that part was new. I didn't expect it. How would the reg/rec go bad with under a couple hundred miles on it..

My Bike Information
1982 Honda DOHC CB750F Supersport
4-1 Exhaust with baffle
Stock intake air box
Slow-speed jet #35
Primary main jet #68
Secondary main jet #105
Ventura, California

nickajeglin

Re: No charge to the battery

Could have been a crappy aftermarket part. I swapped my oem rect/reg for a buddies aftermarket one while I was tracking down my charging issues, and his practically new one didn't work nearly as well.

first bike: 1983 vt750c, my mommy gave it to me.
current: 1980 cb750k