Charging system and other wiring change help needed

Make sure that 4 pole is rated for your alternator output. The cheap ones are usually rated to 20 amps. More expensive, in the 100 amp range are in the 75+ range for cost.

You can buy a lower dollar cutoff, ford solenoid and a CD relay for under the cost of a appropriately rated 4 pole switch. If one of them fails, you aren't spending another 75+ again.