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Motorcycle Repair/Honda Dream CA77 blows fuses

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Question
Hello,
I have a Honda Dream CA77 that I have been completely rebuilding. I am having a problem with my dream continually blowing fuses. So far I have put a brand new ignition switch on it. The headlight functions work but the taillight is currently not working. It has no horn and the starter is there but the switch to use it is missing. I really am running out of ideas but I'm wondering if the generator could have anything to do with it possibly? Any feedback you have would be greatly appreciated.

Thank you for your help.
Cheers,
Charles

Answer
Charles,

There is a somewhat useful wiring diagram on http://oldmanhonda.com/MC/WiringDiagrams/MCwiring.php

If your tail light isn't working, either you don't have a good ground path from the bulb socket to the plate to the tail light bracket to the rear fender.. or you have a pinched/shorted wire back there.

If the fuse blows in the first position from OFF to the right, the circuits involved are the ignition/coil, the horn, the brake light switch the neutral switch and the starter solenoid primary windings. Any of the wires to these circuits should either be hooked up to the proper components or insulated from touching ground paths.

If the fuse only blows when you turn the ignition switch to the next function up (Lights), then you have to look at the instrument light, headlight/high beam indicator, tail light functions and the dimmer switch on the left side of the handlebars. All the wiring inside the headlight must be checked. On some of the early bikes the GREEN wires are ground but some are 12v hot leads from the dimmer switch. If you cross them up, the fuse blows every time.

Bill Silver
www.vintagehonda.com

I have extensive restoration guide information available for Honda Dreams. Check site for details.  

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Bill Silver

Expertise

Need help with vintage Hondas from the 1960s? I am an expert with 250-305cc bikes in particular and most all of the other pre-91 models, in general. I do NOT claim to have a great deal of experience on Gold Wings, Cruisers, ATC/ATVs and dirt bikes.

Experience

I have owned/ridden/maintained Honda motorcycles for 35 years. I have written five books on Honda repairs and collecting. I was a service manager for two Honda shops back in the 1980s.

Organizations
VJMC (Vintage Japanese Motorcycle Club) of North America

Publications
VJMC newsletter, as editor for two years and as contributing editor currently.

Education/Credentials
3 years auto shop in high school, teacher's aide in Automotive Technology in Jr. College, Diesel mechanic course in college, self-taught mechanic and automotive writer.

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