frogman
'74 CB360, '71 CB450, '75 CB550SS
Read over your schematic well, the black wires are KEYED HOT, the red is hot all the time. The green is ground. Make sure you have continuity from the negative on the battery to the frame and engine.
If you don't have power, best start at the battery and follow the red all the way to the ignition. Understand that the ignition switch has 3 positions, OFF, ON, and PARK. In PARK you will only have power to the tail light. Make sure your fuse box connection is in the correct plug and that the fuses are good. There are 3 plugs in that area that all look the same, but have different wires coming out of them. Fuse box, regulator, rectifier.
And yeah get a multimeter.
maybe a box of fuses to. 
If you don't have power, best start at the battery and follow the red all the way to the ignition. Understand that the ignition switch has 3 positions, OFF, ON, and PARK. In PARK you will only have power to the tail light. Make sure your fuse box connection is in the correct plug and that the fuses are good. There are 3 plugs in that area that all look the same, but have different wires coming out of them. Fuse box, regulator, rectifier.
And yeah get a multimeter.





