Users Manual Chapter 5

Thor VM3A Vehicle-Mounted Computer 93
Vehicle 50-150 VDC Power Connection
1. Please review the Wiring Diagram for 50-150 VDC Power Supply, Screws on Top
of Lid, before beginning power cable install.
2. The Thor VM3A must not be mounted in the dock. The power switch on the dock
must be turned Off. The power cable must be UNPLUGGED from the dock.
3. Route the cable from the computer to the DC/DC power supply. Route the
power cable the shortest way possible. The cable is rated for a maximum
temperature of 105°C (221°F). When routing this cable, it should be protected
from physical damage and from surfaces that might exceed this temperature.
Do not expose the cable to chemicals or oil that may cause the wiring insulation
to deteriorate. Always route the cable so that it does not interfere with safe
operation and maintenance of the vehicle.
4. Cut the cable to length and strip the wire ends. Retain the portion that was cut
off for use in connecting to the vehicle power.
5. Remove the lid from the DC/DC power supply.
6. Connect the stripped end of the positive wires (red and red/white twisted
together) to the output block. See Power Cable Identification for 50-150 VDC
Power Supply, Screws on Top of Lid.
7. Connect the stripped end of the negative wires (black and black/white twisted
together) to the output. See Power Cable Identification for 50-150 VDC Power
Supply, Screws on Top of Lid.
Note: The input and output blocks each have two + (positive), two – (negative) and two
(ground) connectors. Either connector in the block can be used to connect the
matching polarity wire.
Caution: Twist the red and red/white wires together and twist the black and
black/white wires together before connecting to vehicle power.
Wire Color Connection
Red DC + (10-60 VDC)
Red/White DC + (10-60 VDC)
Black DC -
Black/White DC -
Green Ground
Blue Ignition Input (optional)