Can anyone tell me the part numbers and types of the instrument panel switches used in my Duchess?
Search strings: Duchess switches; circuit breaker switches, heater switch
Technical Editor:
DUCHESS CIRCUIT BREAKER SWITCHES
14 volt
Taxi 20TC2AA20 20 amp.
Nav lights 20TC2AA7 ½ 7 ½ amp.
Strobe light 20TC2AA10 10 amp.
Cabin Blower 20TC2AA10 10 amp.
Pitot heat 20TC2AA10 10 amp.
Autopilot 20TC2AA5 5 amp.
Electric trim 20TC2AA5 5 amp.
28 volt
Taxi light 20TC2AA10 10 amp
Nav lights 20TC2AA5 5 amp
Strobe light 20TC2AA10 10 amp
Cabin blower 20TC2AA10 10 amp
Pitot heat 20TC2AA10 10 amp
Auto pilot 20TC2AA5 5 amp
Electric trim 20TC2AA5 5 amp
DUCHESS NON-CIRCUIT BREAKER SWITCHES
Cabin heater 8946K660 (double-pole, double-throw)
Alternator field, RH-LH 7560K86T32M (white cover)
Battery master 7560K86T32T (red cover)
Boost pump, RH-LH 7560K86T32T (red cover)
Cabin heater switch P/N 8946K660 does not supersede to a different number. I cannot tell from drawings if the white rocker cover can be switched from one switch to another. It is improbable, as the different types of switches were made by different manufacturers; but I guess you never know.
I do not believe that the white alternator 7560K86T32M switch can replace the 8946K660 heater switch. I think that the 7560K switch is a single pole single-throw switch; and the heater switch is a double pole-double throw switch for the two heat levels.