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WEBASTO THERMO 300 5INSTALLATION
5-9
5.9 Wiring Connections
5.9.1 General Information
The control unit is equipped with low voltage protection, therefore it is imperative to keep vehicle batteries in good
condition. Thermo 300 heaters are available in 24 volt configurations only.
5.9.2 Timer and Switch Connections
Fig. 5-7: On/Off Switch
Fig. 5-8: 7-Day Digital Timer Model 1531
5.9.3 Timer or Switch Installation
1. Select a suitable location in the vehicle for the timer or On/ Off switch.
2. Connect the harness to the timer, or switch.
CAUTION
Whenever welding is to be performed on the vehicle, the main battery cables must be disconnected from the battery
to protect the electronic control unit.
NOTE:
The Thermo 300 heater will not perform to your satisfaction with weak batteries.
To Vehicle Ignition
Black on x3 (A pin)
Ground
To Vehicle
Dash Lights (optional)
Blue on
x3 connector
(C pin)
Power
(24 V)
ON
OFF
GROUND
POWER