How to restore power to my motorcycle?

I have an '85 Honda rebel and it doesn't power on when I turn the key - no light or anything. The battery seems fine (reading 12.4) and the fuses all have continuity. I'm pretty clueless when it comes to.working on motorcycles, especially when it comes to electrical work. Any suggestions?

Battery lasts 5 years. It will still read 12 odd volts but it may not even light up one light bulb. You need amps. (or a good battery). That is where I would start first. If you are careful enough you can use jumper cables from a car battery to see if it works. If it lights up, then you know.Battery.

If the battery is charged then one of the next most likely culprits is the ignition relay

12.4V is low for a battery with no load. I would expect 13V plus.

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