'06 F-250SD
XL basic pkg

It does have the over cab clearance lights. I changed out the 2 dim stock GE Halogen sealed beam headlights (35w) for 2 brighter GE Halogen HO sealed beam headlights (55w). Cost about $10 each and a big difference! Also noticed the 2 holes under my tailgate area for the light bars you see on the back of a dually. Added a 16" light bar that contains 3-194 bulbs in it and wired it up to the passenger side license plate light (I did not want to interfere with the spare tire crank tube on the drivers side). I dont have the factory bumper fog lights. So with these basic mods I made, do I need to add a relay somewhere or can my factory dash switch handle this extra load? If not needing a relay yet, how much more can the stock dash switch handle safely? How many AMPS does each 55w headlight require? How many AMPS does each 194 bulb require? Is there a formula for this?

 

Yes watts = amps x volts so 110w/12v=9.2amps. You could do a headlight rewire mod, which is basily required for the crappy tiny wiring in the pre '92 trucks, but these trucks seem ok.

Adrianspeeder

 

So I should be ok unless I add more lights?

 

Yup.