Starting problem-1981 CB750f

[DougB-2]

My 1981 CB750f is having some issues.

To make it easier I'll try to describe everything i know:

When I insert the key and turn it to the On Position Nothing happens.. No neutral light or Oil Light. Additionally the starter button wont trigger the starter.

Battery is fully charged: 12V of the voltmeter
Checked all the connections behind the headlight, all seemed ok.

This just happened out of the blue.
What is going on?

[cbRider]

When you say you checked the connections, did you check them with a test light or just visually?
You need to do this with a test light or a meter. Start at the ignition switch and see where the power stops.
First thing obviously is to test the battery.

Good lock
Karl

[DougB-2]

What specific connections should I be checking with the voltmeter?

[Rodgil]

Have you checked your fuses?

[DougB-2]

The main ones in over the handlebars.. Im unsure if there is a main fuse( down near the battery) or any in line fuses like some bikes have.

[cbRider]

DougB,

right behind the left side cover you'll see a connector with four wires coming out of, pull off the connector,
open that little black cover and there is the main fuse. It doesn't look like a regular fuse, it is a little metal strip held in place by two screws.

Karl

[ccRider246]

Doug,
Check that fusible link that Karl mentioned. That's what gave me trouble. It can look okay visual but it can break. I had that same problem but it died on the road. After waiting about 10 minutes it would start up and run up the road a few more miles and die again when I came to a stop. I couldn't see anything wrong (I had no test equipment on the road). What was happening was that the link broke but when it was cool the two sides were so close together that they passed enuogh current to start the bike. Then they would heat up and separate and when I came to a stop it would die.
I installed an inline 30Amp weatherproof blade fuse holder ro replace the fusible link.