Mercedes-Benz 410 D Operating Instructions Manual page 101

Key to wiring diagram,
supplementary hot-water heater
208D-410D
B 1 Micro switch, heater blower
H 1 Operation indicator light
K 1 Relay
K 2 Relay
K3 Relay
K 4 Relay
M 1 Heater blower (cab)
M2 Heater blower (cargo space)
M 3 Circulation pump
N 1 Control unit
N2 Heater
S 1 Timer
S 2 Switch, supplementary heater
S 3 Switch, heater blower motor
V 1 Diode
V 2 Diode
Y 1 Solenoid valve
I - IV Additional fuses
a Clamped connector 3 wires,
terminals 3
b Clamped connector 3 wires,
terminals 1
c Clamped connector 3 wires,
terminals 2
d Connection, fuel gauche
illumination
e Ground
100