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I'm going to be replacing my factory bumper with an aftermarket bumper with a 30 inch light bar and no fog lights. With that being said I would like to wire the light bar harness into the factory fog light switch. I believe this is the wiring harness I will be using below.
It would be ideal to just splice the three wires going into the harness switch and attach them right to the fog light switch, but I'm not sure if the factory switch has 3 connections or not.
Yes sir, the current bumper has fog lights. The new bumper will have a 30" 300watt light bar.
I can't help but think that it would be easier to just splice into the current fog light connectors (at the bumper) then and not even worry about the switch. I don't know what the amp draw is on that light bar, but if it's much higher than the fog lamps, you would need to use a higher-amp fuse, but everything else would be untouched. I'm ready to be corrected on this, but that seems to me the simplest course of action.
If you are not going to have fog lights I would leave existing wiring alone and use the fog light wire at the bumper to trigger a relay to power the 300 watt lights.
Of course you will need a fused 12 volt supply, a new relay and good to go.
If you are not going to have fog lights I would leave existing wiring alone and use the fog light wire at the bumper to trigger a relay to power the 300 watt lights.
Of course you will need a fused 12 volt supply, a new relay and good to go.
If you are not going to have fog lights I would leave existing wiring alone and use the fog light wire at the bumper to trigger a relay to power the 300 watt lights.
Of course you will need a fused 12 volt supply, a new relay and good to go.
I could be wrong but isn't the current wiring for the fog lights only rated for like 80 watts? Wouldn't I need to upgrade the wiring?
Another issue with this is if I popped a fuse because of the light bar I would lose all my lights - I believe. If I'm not mistaken they're all on the same circuit.
Thank you,
Nick
Last edited by nrmartini97; 07-28-2019 at 06:07 PM.
I just went through a somewhat similar situation on this except I was adding a light bar to the high beam switch. All you need to do is tap that blue wire going to the switch to a positive lead on the old fog light connections. Super simple. Then the light bar is getting its power from the relay harness you are just using the signal from the fog light switch to power the relay on. I would go ahead and also buy a relay with a built in resistor if you go this route. After some recommendations from members on here and some research it will protect your factory computers from any backflowing current when the bar is shut off. Not sure if totally required but for 10 dollars on amazon it’s cheap insurance! And the best part was the old relay unplugged and the new hella resistor relay plugged right in.
Edit- not sure if it was clear but in this scenario you would not use the switch or the other two wires going to the included switch at all! Hope that helps
I just went through a somewhat similar situation on this except I was adding a light bar to the high beam switch. All you need to do is tap that blue wire going to the switch to a positive lead on the old fog light connections. Super simple. Then the light bar is getting its power from the relay harness you are just using the signal from the fog light switch to power the relay on. I would go ahead and also buy a relay with a built in resistor if you go this route. After some recommendations from members on here and some research it will protect your factory computers from any backflowing current when the bar is shut off. Not sure if totally required but for 10 dollars on amazon it’s cheap insurance! And the best part was the old relay unplugged and the new hella resistor relay plugged right in.
Edit- not sure if it was clear but in this scenario you would not use the switch or the other two wires going to the included switch at all! Hope that helps
If I'm understanding correctly it would look a little something like this. Only change would be a new relay that has a resistor, and get rid of the harness switch and connect the blue wire coming from the relay to a positive lead on one of the old fog light connectors? If it's that simple I'll definitely go that route.
07-28-2019, 02:16 PM
2017 F-150 Light Switch Diagram
