Do I need the diodes for 2010 Ford F-150?

Question

I am looking at Guide #84031.

I was going over the instructions for the stand alone install of the EVO-ALL for my truck and I noticed that they call for 2x 1 amp diodes. Do I really need these? What are their purpose? Is there a part number that you can offer me so that I get the correct ones?

Also, I was looking over the relay wiring part of the instructions and it doesn't look correct. It shows the battery (+) being connected to the supply and one side of the trigger and the other side of the trigger goes to the EVO-ALL labeled "(+)Parking Lights". Both sides of the trigger shouldn't be (+). It wouldn't activate the relay. Unless the EVO-ALL actually supplies ground to that connection. Clearification would be appreciated. Thanks.

Answer 1

The Brown/White is a negative Parking Light output, we will bring correction to the guide since it's labled as (+). The Diodes on Accessory and Ignition are mondatory to prevent feedback from the vehicle.

Answer 2

If you do not put the diodes, turning the key to accessory will then also turn on both accessory and ignition. Your car would have no more dedicated accessory only position.