Voltage problems, cutting out when hot

mopower76 said
Fan main power is fed at the starter relay, I thought about rerouting to the lug on the alternator instead of the starter relay.

On the alternator side is the only way that makes sense.
The purpose of the factory ammeter is to show the amount of charging or discharging of the battery. If additional equipment is placed on the battery side, then the ammeter readings won't be very useful.

mopower76 said
When I remove the power to the fans, there is no change in voltage just as when they are not running voltage readings are the same.

Voltage is potential. Assuming the power source can provide the amount called for, the system voltage won't change.
An ammeter shows flow.

mopower76 said
The extra ballast should be wired correctly, I’ll retrace the wires to be sure. All I did was flip the connectors upside down using the correct pins/sides and used jumpers to the new .8 ballast.

The ballast resistor should be matched to the coil and to a lesser extent the ECU.
P-part orange box and Blaster 2 is probably should have either .5 Ohms or .8 Ohms resistor in circuit branch directly feeding the coil. Not both.