Posted by js305 on September 15, 2013 at 16:11:42 from (184.79.57.233):
In Reply to: Fuse taps posted by Diydave on September 15, 2013 at 03:20:16:
There are several ways to do this. One way is to use the fuse tap in the fuse box only for turning the relay on and off with the key. Use a very small value on that fuse as the only thing being added is the coil of the relay. Run the power directly off the battery, or a terminal block close by on many vehicles, through an inline fuse that's appropriate for the load, through the relay, to the load (camera?) and then to ground. That way your ignition doesn't know anything extra is added because of the low draw from the relay coil, and the points in the relay take the load.
I do this on our fire trucks. We are a volunteer department and the newer trucks (especially the Fords) are hard to rig up where the user turns the key on and everything works. Long story for another thread.
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