Users Manual Chapter 5

88 Thor VM3A Vehicle-Mounted Computer
Fuse Requirements 50-150VDC Power Supply, Screws on Side of Lid
For all voltages, use the 3A fuse from the kit or a slow blow fuse that has a DC volt-
age rating greater than the vehicle input voltage.
Note: For North America, a UL Listed fuse is to be used.
Power Cable Identification for 50-150VDC Power Supply, Screws on Side of Lid
The DC power cable is included with the dock:
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 computer 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 VM3A 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 of the cut off
cable for use in the connection to the vehicle.
Warning: For proper and safe installation, the input power cable must be
connected to a fused circuit on the vehicle. If the supply connection
is made directly to the battery, the fuse should be installed in the
positive lead within 5 inches of the battery’s positive (+) terminal. Use
VM3055FUSE (or equivalent) to install the fuse as shown below:
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)