If you have no electrical power to anything and you know that the battery is good, then check this out.
There's a fusible link in the cable from the +ve terminal of the battery, it's usually covered by sleeving. Slide the sleeving down and you will see it ( like a link soldered in ) if that's blown you won't get anything.
The blue wire in the picture is the fusible link and should be connected to the ring crimp that you can see bolted to the battery connector
Pictures courtesy of Todd
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