this is a crown im assuming
GE labels those just as TB1-6
crown adds the 11
anywho
tb-2 is the brake switch and start of accel switch (if equipped) battery volts with the brake released and the accel depressed (the brake switch is normally closed)
tb-3 is the seat switch or operator presence switch (for the stand up) battery volts
tb-4 is battery volts from the key switch
what problem/ code do you have?
every tb connection reads battery volts except tb-1 for the pot
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