I'll just preface that my wiring was completed through what I wanted. So I wouldn't recommend just using these without knowing your current draw and what will take the power. BUT... I used a power block similar to this:
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It has common power in that you can take from a relay, or acc. or ign and then you can splice or attach your parts off from that later.
Because i run an isolation switch for the battery, and I wanted to make sure that some things had power even when the battery was off, I used these boxes. So i have one for Interior lights, Horn, Radio constant, and all those things. Runs straight off the battery.
Then some things off accessories, some off ign. Some which are relayed and others that come off the barrel. Its a bit complex, but it works well for me. Just fits under the dash. I'd like something a bit neater though.
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Ongoing Project: 1972 Datsun 510 S13 SR20Det.
http://ozdat.com/forum/viewtopic.php?f=33&t=17898
New Daily: D22 Navara (The new workhorse)
Retired 12/2016: MY98 Subaru Impreza RX
Previous Car: Restored Green 1972 Datsun 510, Hot L18