Can anybody tell me which wires need to go where to put a new plug on my block heater? And if somebody can give me a quick rundown on how to put my grid heater on a switch I would greatly appreciate it

 

The grid heater contactor's are wired in parallel. One side goes to 12 volts, the other side is grounded through the PCM IIRC.

 

Standard block heaters that go in place of a freeze plug have three round terminals. The middle is for neutral, and the outside two get positive and negative in any order.

Hopefully this helps.

 

I disconnected my grid heater entirely. However, I would run it on a manual momentary pushbutton with a relay - that way you aren't running 30+ amps to a switch on your dash.

Since the block heater is 120volt AC, there is a ground, hot, and neutral. The hot and neutral doesn't matter which is which since it is a simple heating element.

 

Exactly correct. Sorry, I gave the wrong terminology. Positive for hot and negative for neutral.