U20-3, U25-3 WSM Electrical system (Mechanism section)
V-M-11
(3)Current flow
(1) Battery
(2) Horn switch
(3) Horn relay
(4) Diaphragm
(5) Core
(6) Coil
(7) Moving bolt
(8) Adjust nut
(9) Moving plate
For your information
1. Function of diode: Prevention of horn switch by absorbing the surge current.
Inductive type of load, such as solenoid valve generates arc spark at switch point.
This diode installed parallel to solenoid valve let the surge current energy flow back to coil to consume
as a joule heat.
In this way, surge current won't flow to horn switch.
(4)
(3)
(2)
(1)
(6)
(9)
(5)
(7)
(8)
Diode
Switch
Relay
Horn
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