Auxiliary Lighting question
Last edited by Y2KW57; Sep 29, 2024 at 09:12 AM. Reason: Clarified thread title to identify thread topic
Is this a correct interpretation of your intent?
Or are you viewing the pockets of the bed steps and bumper steps to serve as recessed shrouds to ensconce big flood lights to wash a wide swath of light over the surrounding ground?
If just looking for step lights to better see where to stick your foot, you can buy LED license plate lamp fixtures fairly inexpensively. They are about a half of an amp each, so all four could be wired to one switch and still amount to only 2 amps with all of them on at once. That way you'll still have switches available for other functions.
If looking to wash the ground area in light with brighter fixtures that draw more current, then be mindful of the current limitations of each switched upfitter circuit as you begin to accumulate amps in your load profile.
If each lamp is 5 amps, and the switched circuit is rated for 20 amps, then in theory you could still run all four 5 amp lamps with one switch. However, the caveat to this is in the length and gauge of wire that you run to each lamp. Longer, skinnier wires add resistance, which is seen by the switched circuit as additional load.
I've installed LED license plate lights to illuminate step areas, as well as the LED flood lights to illuminate both the rear work area as well as the lateral work areas on either side of the truck, as well as LED strobe lights, front and rear, high and low, for conspicuity purposes when the truck is working on the road... all using the OEM upfitter switches to activate the array of lights.
It took over 500 feet of wiring to add the forgoing mentioned lights to a 20 foot long truck. It can be a fair amount of work by the time strain reliefs, protective wire looms, drains for the wire looms, heat shrink for the splices, harness plug and unpluggable disconnects for each lamp fixture for future service or replacement, etc is added up.
And not only is it important to consider the gauge of the wire for the fixture load and the length of the run, the insulation class of the wire should be considered on the curbside of the vehicle, where the very hot catalytic converters or diesel exhaust aftertreatment cans are situated. In those areas, wire with cross linked polyethylene jacketing is recommended.








