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Brett;
Fusing the driving light circuit is a very good idea and certainly recommended, but if you take the relay and light power from the Fuse panel in order to use one of the IGN power fuses there (likely Fuse2), be aware, that you will also subject your (poor) ignition switch to the high additional current...I prefer not to do this, as it would age the switch more quickly...and would discourage you from doing this also.
I suggest the following: Get an automotive power relay like for instance Potter&Brumfield type VF4 ( Jameco.com PN171459CD $1.89), which has the coil power seperate from the load power. This will alow you to power (just) the relay coil (minimal current) from the high beam circuit when you have a control switch on the dash activated, and power the heavy light current through a seperate (20A) inline (3AG glass type) fuse which you add on (also about $2), and pick up power directly from the battery...or battery terminal of starter.
Those Bosch 30A automotive power relays are of good quality and would work just fine, but I don't have a source and PNs for those handy, just remember it needs to be a four terminal type, not three.
Locate the relay with the others on inner fender and connect up as follows:
Refer to wiring diagram: http://www.intelab.com/swem/122S%20Wiring%20Diagram.jpg
30 - Fused Dr. Lights power in from battery or bat terminal on starter.(12Ga wire)
87 - Lights power out to Dr. lights (12Ga wire, ground other side of lights to a clean chassis connection)
86 - Coil power from hibeam circuit (red wires at relay cluster on 122)
85 - Dr light control (connect to ground at dashboard through a toggle switch to activate)
Optional - Control lamp is powered by a small gauge wire from terminal 87 to an indicator on the dash (preferably right near control switch). Other side of indicator connects to dashboard as a ground.
Simple, effective, with minimal additional burden on the IGN switch and OE fuseblock, all high current wiring stays under the hood...the only additional wiring under the dashboard are two small gauge control switch and control lamp wires.
Additionally, since the coil is powered by your highbeam circuit, the driving lights will automatically go ON and OFF when you switch back and forth with your footswtich, AND when you turn OFF your lightswitch when after parking, the relay drops out automatically too...electric living at its best!
...longwinded once again, but I am compelled to cover all details clearly and fully...prevents disappointments...and smoke!
Cheers
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