Topic: 1974 CB750 Electrical!!!

[Kcinnick]

I know I want to replace everything electrical in my bike.  I got it yesterday with plans to replace all electrical, but didn't realize HOW bad it was.

I know I need a new wiring Harness.

I am going to replace the positive and negative battery cables and fuse box. (would like to keep original)

I don't have my manual yet, but I want to replace EVERYTHING behind the left side panel.

Any help on what all I need to order to replace, right now it is just a rats nest in there, I can't make heads of tails, but lots of butt connectors and incorrect wire colors...

Also considering Replacing the starting components, Stator and Rectifier while I am at it.

My other two projects while doing this is getting a replacement left side bottom factory exhaust and new factory handlebars.  I am also rebuilding the forks, probably with an upgraded kit, just haven't decided which one.

Thanks for any info, hopefully I can answer some of my own questions with a manual, but I would LOVE to get parts ordered before the manual arrives, thanks to the holiday it will probably be the end of the week before I get it.  At least I got a running CB750 in pretty darn good shape because the kid didn't know enough to keep it running.  He kept chopping wires... 

Ultimately I hope to have a clean original bike, not necessarily 100% restored, but a nice bike in good shape that is close to original as possible.  They don't make bikes like this anymore and you won't catch me on a new bike.

[grumpy]

if you're completely starting over then I'd say get a new OEM harness.
then get some wire & connectors from http://www.vintageconnections.com/

honda actually did a really good job of color coding the wires so I'd stick with the OEM color convention. it makes a lot of sense if you study it.

[PeWe]

I thought that I had to replace all electrical stuff on the left side when when my CB750-76 had been sitting in a barn for 20 years. But NO, everything worked.... Only battery had to be replaced and new paint on battery holder.

I replaced the main harness 1983-84 so I knew it was fresh I had to order new pilot lamp harness from Japan, yamiya750.com
I replaced both handle bar switches that both looked bad.  All these stuff including fuse box can be found at http://www.vintagecb750.com and other sites as well.
http://www.vintagecb750.com/products/5/electrical/55/wiring-harnesses-and-charging-system-parts

This might be closer
http://www.cb750supply.com/products/5/electrical/55/wiring-harnesses-batteries-and-charging-system-parts

Why wait for the manual???
Download and read now!! http://www.honda4fun.com/materiale-documentazione-tecnica/shop-manual
Scroll down and you'll find CB750 shop manual in 6 files (eng).
The circuit diagrams can be found there. I attach K4 circuit diagram if that is the model you have

Edit: Check your main harness. I found it can be damaged when pulling, mounting the engine. Or, if a maniac electrician has damaged the wires where connected inside the head light.

[PeWe]

+Hondaman's book. I fully agree.
I have in the ordering/shipping process. An investment with short payback time.

[Kcinnick]

A picture of what it is suppose to look like behind the side cover wold be amazing.  Now their is a mix of butt connectors and black, green and wires going who knows where and even with electrical knowledge I can't make heads or tails of it.  They have modified butt connectors to go over the old bullet connectors and clips wires when something started causing trouble...  I know the wiring harness will fix 90% of the issues on the bike.  I want to stay as original as possible.  Looking at the bike, I could probably wire the thing without a harness, but I want to keep it original.  I need very few pieces to get the bike back to 100% stock.  Some parts that are cheap, I look at them as "might as well replace" since I am already in there.