Users Manual Chapter 5

Thor VM3A Vehicle-Mounted Computer 89
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 10-60 VDC
Direct Connection.
7. Connect the stripped end of the negative wires (black and black/white twisted
together) to the output. See Power Cable Identification for 50-150VDC Power
Supply, Screws on Side of Lid.
Note: The input block has V
IN+, VIN- and GND terminals. The output block has VO+ and VO-
terminals.
8. Use the portion of the power cable that was previously cut off to connect from
the DC/DC power supply input side the vehicle electrical system. Connect the
ground (green) wire from the computer to the GND terminal on the input side of
the DC/DC power supply.
9. Route the wiring from the DC/DC power supply to the vehicle’s electrical
system. Do not connect to vehicle power at this time.
10. Strip the wire ends and connect to the input side of the DC/DC power supply.
11. Use looms and wire ties to secure all wiring as shown.
12. Reattach the cover with the screws.
13. Connect the DC/DC power supply to the vehicle’s electrical system as directed
below:
•V
IN+ is connected to battery positive
•V
IN- must be connected to battery negative
• GND must be connected to the vehicle chassis ground
•V
IN+ is connected to battery positive
•V
IN- must be connected to battery negative
Caution: For battery powered vehicles only.
Caution: For internal combustion engine power vehicles.