RoyC

My 2014 C-Max hybrid has similar issue. The license plate light and all associated lights, such as trunk lights, are never fully turned OFF. I suspect this bad hardware design causing 12V battery drained continuousely and shorter lifespans. I replaced some light bulbs to LED ones to reduce the drain, so far so good.

While I was working on my fog lamps retrofit, I saw a lid for a plastic box (for electrical?) not sealed. I could see the same thing from top too (near jump start terminal). My Ford dealer was reluctant to do anything. Does anyone have the similar situation like mine?

I was thinking about a separate switch just for the fog lamps. However, I could not figure out a place for that switch. Running those wires could also be a headache. I upgraded my low lights to HID awhile ago. In my case, HID lights are much brighter than LEDs, maybe 5 times brighter. There is not much difference driving in the dark with or without my LED fog lamps. I mainly use these fog lamps as DRL.

I gathered all the parts from previous posts. Headlamp Switch, CP9Z-11654-J or Motorcraft BM5T-13A024-JE sw:04 hw:04Outer Grilles, DM5Z-17B814-A and DM5Z-17B814-CWire Harness, FV6Z-15K867-AFog Lamps, 4F9Z-15200-AA x2Fog Lamp Bolts, W701459-S424 x4Fog Lamp Nuts, W700895-S300 x4 Before putting everything together, I tried the headlamp switch first. It did not turn on the the warning light for log lamps so I assumed the BCM was not configured/programmed to operate log lamps. Later, I was not able to find any cable/connector to connect to the fog lamp cable either. I decided to go with plan B, the parking lamps. I connected a relay to the parking lamp cable to switch power from "jump start" box. The only drawback I can find in the configuration is my fog lamps will be turned on when parking lamps are on. I use LED H11 which takes about 3 amps for both.