There are three wires that feed into the "T" terminals on the starter. There are three power leads running to the "L" terminals for incoming power. Three lines and a ground. I'm thinking that whoever put the jumpers in was applying some old hearsay fix to a problem of low voltage. ???
The starter has no switch, these 14ga wires are installed as a permenant part of the run and start. It starts across the line and has no other contactors. The load is constant, it's an air compressor motor. It is single speed.
I recently ran across a motor that had been wired with a resistance wire from phase to phase on the T terminals of the mag starter. The motor is a 25hp 1750 rpm motor that was having a "slow start" issue. A 14ga wire was installed between T1-T2 and then from T2-T3. What is it's purpose and why...
