Topic: Basic wiring help needed

[RicardoOP]

I put a new wire harness, left and right controls and ignition switch on my 1974 CB750. I’m confused on how the wires need to be connected at  headlight bucket. I did have all lights working before but many wires were tape and had different colors so I wanted to replace them. I’m wonder exactly how the wires connect in the bucket because now I don’t have power at lights when ignition switch is in first position. Please excuse my English but I’m trying.
Ricardo

[willbird]

On this website we are typing on there are wiring diagrams I have found to be very helpful. They have the proper wire colors.

I have heard that a few aftermarket hand controls may have incorrect wire colors or maybe at least one extra wire.


Bill

[newday777]

Where did you get the new harness and hand controls from?

The last picture you posted has 1975/76 front turn signals. What is the manufacture date on the steering neck vin plate?

[willbird]

Here is the diagram that should cover your model.

http://manuals.sohc4.net/cb750k/technical_reference/WD750K3_K7.jpg

here is the directory where you can navigate to each diagram.

http://manuals.sohc4.net/cb750k/

[RicardoOP]

Ok to answer the questions, the date on the vin plate is 12/73 CB750-23356037
I don’t know where the turn signals came from. They were on bike when I got it.
My manager bought the parts for me at Amazon and came from 4 into 1. I used the multimeter and checked for continuity at both ends of every wire first and tested good. I found the diagram on here before and use it to do the wiring. I can’t figure out why when the key is turn to first position there are no lights working at all. My question is what is the first thing I need to look at?

[newday777]

1st is do you have 12 volts going to the key switch?

[bryanj]

If you want to email me direct on blj@blj.org.uk with pictures of the two switches and wire colours i will try and help you out BUT do remember i am in UK so answers will depend on time difference and work so not instant, first question does your loom have 1 fuse or 3

[RicardoOP]

The battery is shows 5.8 volts so it is charging on charger now. If I don’t have the 12 volts tomorrow morning I will buy a new battery. It has 3 fuses.