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Scott - my apologies for not being clear. A Centech is a fuse panel you can mount on the bike to obtain power for powered accessories, lights, GPS etc.
You can obtain the Centech as is, or you can also order a controlling relay.
What I have shown is the Centech with controlling relay. What the relay does is it will provide power to the fuse panel only when the relay is energized. If you do not use the relay then when you install the fuse panel it will always be hot. There is no issue whether to install or not install a relay.
I installed a relay so I do not have to remember to shut things off when I get off the bike.
It is almost a requirement on any CanBus bike if you want to add a powered accesory and want to obtain power from the battery without causing fault lights to come on.
** NOTE on the CanBus - the CAnBus is the wire harness used in the bike which connects all the computers and sensors, the fault is actually detected by the ZFE (main Bike Computer) and throws the fault - usually for a noted increased load.
The second it helps organize any additonal wiring of said accessories.
You can also use it on non-CanBus electrical systems for the same reason of organization.
But if you have only a farkle or two, you can just go to the battery and install an inline power fuse I assume? Except you wouldn't have a relay to automatically shut the farkles off....