2017.06.19 FwdMan2.8.17.docx 2-15
12V Power Socket for Trailer
The heavy, (provided) circular 12V Power Output Socket for connection of the Trailer Power
Cable should be mounted on the rear of the vehicle, close to the trailer hitch ball, but so much
above or to one side of this, that it will allow for sharp turning of the vehicle/trailer.
The socket should be connected to the alternator by two heavy wires (provided, 35 sq. mm /
No 2 AWG or heavier) as follows:
The POSITIVE terminal should be wired to the 100A fuse in the heavy fuse box (OR in
the diode unit, if applied).
The NEGATIVE terminal should be wired directly to the alternator GND connection
(normally the alternator housing). ALTERNATIVELY, the negative socket terminal AS
WELL as the alternator GDN could BOTH be connected to a GOOD, SOLID CHASSIS
BEAM GROUND point or the like. Connection points should then be cleaned to BARE
METAL before connection. This alternative GDN wiring will only work if performed
carefully and will easily fail after some time if not properly corrosion protected.
Power Inverter
If a 12VDC-to-110/220VAC Power Inverter is needed for Computer supply, then it will be
provided. This Inverter will produce heat and should therefore be placed so that natural air
flow can cool the unit. Alternatively (or in addition), a fan could be used for forced cooling of
the inverter, if high ambient temperatures are expected.
The 12V input terminals of the Inverter should be connected to the Heavy Fuse Box as
follows, using heavy wires (provided, 16 sq. mm (No 6 AWG) or heavier):
This connection should be performed very carefully, using as short wires as possible to reduce
voltage drop. TOO LOW VOLTAGE input to the Inverter MAY CAUSE
OVERHEATING/BREAKDOWN of this unit.
2.2.4 Plate-Low Alarm Connection
If the ALARM socket of the Remote Control Box is connected to the electrical system of the
towing vehicle as described below, then the system will produce a warning if it is attempted
to drive before the FWD/HWD plate has been raised from the ground during the
measurements, or if the plate lowers while driving between test points. In both cases the plate
will be raised automatically.
When the towing vehicle is in PARK mode (alternatively when handbrake is pulled), then the
external connection to this socket should either provide 12VDC across pins 1 (positive) and 3
(ground) or provide a current flow (of 0.1 to 0.5 Amp.) into pin 2 (positive) and out of pin 3.
When the vehicle is NOT in PARK mode (handbrake NOT pulled), the voltage/current must
disappear. The Park LED on the Compact15 front panel should reflect the state of the signal
(LED ON=PARK).
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