The wires at the cowl are wires that were installed for the vehicle owner to add electrical accessories. They are blank on both ends and just pass thru the fire wall. Also the cords for the block heater can be hard to find. Not sure where they hide them on the SD/X's but if you do find the heater then you can trace the wiring. Also even if you don't have a block heater the hole will be there to add one. Check eBay as you can find them on there sometime for a pretty good price.