The PURPLE wire becomes +positive when the key switch is in the ON and also START positions.
The BROWN (TAN) wire goes back to the temp switch and when it gets grounded due to overheating the horn should sound with a continuous BEEEEEEEEEEEEEEEEEEEEEP not BEEP--BEEP---BEEP etc.
The BROWN (TAN) wire goes back to the temp switch and when it gets grounded due to overheating the horn should sound with a continuous BEEEEEEEEEEEEEEEEEEEEEP not BEEP--BEEP---BEEP etc.