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Elite Member
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Join Date: Nov 2006
Location: Pocono Mountains
Posts: 7,498
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Elite Member
Join Date: Nov 2006
Location: Pocono Mountains
Posts: 7,498
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The lower circuit only has one fuse, because the fuse is upstream from both the switch and the load. One fuse covers both circuits.
The upper has a separate fuse, which is sort of belt and suspenders. If the tap is on a vehicle circuit that is fused, it is optional. I don't fuse switches which are tapped to fused circuits, but in theory, the low value fuse provides a more precise level of protection. If it's pre-wired into a harness, use it.
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'99 4Runner SR5 5spd 3.4L V6 4WD(U.S), original '99 Talls in front, OME 906s in back, Hella fogs, Trekmaster shocks in front, Billy in back, no running boards, FIAMM horns, Alpine sound, Michelin LTX M/S2's, owned since new.
'97 HiLux SW4 5spd 4WD(Japan model bought in Brazil assembled in Argentina, very close to a 3.0 4Runner/Surf)
'71 FordWillys Jeep CJ5 (with straight six Ford Maverick 3.0 liter engine--lives in the mountains north of Sao Paulo Brazil)
My Backyard Frame Swap
Last edited by TheDurk; 01-24-2020 at 02:50 PM.
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