Why was this wire cut and spliced to the other wire

The green with orange trace comes from fuse F64 30amp. battery junction box. The black with red trace goes to a splice , S24 . from there it changes color to black with blue trace which goes to the blower motor resistor and it also has from the splice a black with orange trace that goes to the blower switch . The switch provides the earth . On high speed the switch directs the current path to ground from the black with orange trace . All the other speeds come through the resistor to ground through the switch . At the connector for the blower switch the black wire is the ground or earth ,how ever you look at it. The switch being burnt indicates high resistance (loose connection ) maybe. Voltage drop test the electrical circuit .

Mastering Voltage Drop Testing with Pete Meier and Jerry Truglia

Power comes from 2 spots. Usually the orange wire(B+) goes to memory. You have to splice into an ignition on wire to power the radio. I splice from the A/C controller.

THERMOSTAT STUCK OPEN OR HEATER.TEMPERATURE CONTROL MODE SWITCH NOT GETTING VACUUM OR THERE IS A ELECTRICAL PROBLEM IN MODE SWITCH.

The two white are the heater
The black the ground
The gray the O2 Sensor output,
you back probe to check Voltage
& Switching Times

The vehicle wiring harness does not have to match
the sensor, BUT -- you need to have the same
connector on the sensor

If you have a universal cut & splice, you have junk,
and we given the wrong part

Get a Bosch or NGK, OEM sensor & just
plug it in

You will see a round plastic blower motor housing underneath the passenger dash approximately 6-7 inches round, plug the connector back into it and you should be good to go.Let me know if it works for you or if you need further assistance

please do not splice buy the kit with the right plug end you will be much happer an so will I

check to see if someone has installed a tow hitch on the rear,they would have spliced in the wiring in the rear of vehicle,thats where i find alot of corroded wire that were poorly taped.

I looked at wiring diagrams at bbbindustries: the orange wire to the 20 amp htr fuse is direct from the ignition switch. You might check: that orange wire splices to the 10 amp brake fuse (fuse #12). check if that also has any voltage problems.
There are two black fusible links that supply power to the ignition switch. the fusible links come from the battery junction block.

wire harness under the drivers floor gets wet and after time he splice for power to the seat starts to corrode and the splice breaks it is the Orange wire if you fix splice the seats should work

this is because it is a theft deturent system try unhooking your battery for about 10 min and try it again and if it dont work try double checking your wires