Do I need to remove the original fuel pump relay from the fuse block when using a hot wire kit? Any issue with connecting the hot wire to the external positive post on the drivers side fender?

 

In most applications, the factory relay is kept and simply acts as the trigger wire for the new larger relay provided in the kit. If the junction is direct from the back of the alternator, it should also see charging voltage, however the best source is to run the new pump wire directly off the back of the alternator to get the highest available voltage directly to the pump. The whole purpose of a hotwire kit is to give more than the typical system voltage of ~12.5v, with the alternator putting out ~14.5v. Any power source after the battery will only see around 12.5v.

 

Also the thicker gauge cable will be able to handle the additional current demand without smoking anything.

 

Sorry, no. With the engine running, the entire electrical system sees alternator output voltage... just look at your voltmeter for confirmation. If in doubt, take a voltage reading at one of the light sockets or any other location where a device has direct power (i.e. where there isn't something else in the circuit providing resistance).

 

You are correct, I misspoke in the point I was trying to make.

The absolute highest voltage with the least amount of drop in the system will come from the lug off of the alternator.

 

Yes, that is true, although if you've done the big three, the voltage drop at the other end of the larger cables would be so small as to be unimportant.