Page 6
Uni Instructions
A Battery Condition Meter can easily be fitted between pin A of the connector and pin d (green wire to pot) as
shown left, below.
If you want the ignition switch also to
disconnect the pot, then the pot’s max
connection can be connected from the
battery positive, via the ignition switch as
shown far right. In this case you will
certainly need to re-adjust the gain
preset.
Note that a resistor (10K with a 10K pot
but not critical as you adjust the gain
control) should now fitted in the white
wire to the top of the pot.. If this resistor
is not fitted, the pot fault detection circuit
in the controller will not operate properly
and the controller may go to full speed if
the pot or wiring becomes faulty.
When wiring like this, you will have to
adjust the Gain control so that full speed
is reached at full pot rotation.
Battery Condition Indicator
Internal connector
A 4 pin connector is supplied on the circuit board:
bare board controllers are supplied with a mating
connector, shown below.
This is an Insulation Displacement Connector (IDC):
do not strip the insulation from the wires, simply
push them into the top part of the open connector
from the ‘knobbly’ side, and squeeze it closed in a
vice or with suitable parallel action pliers.
The mating connector supplied is suitable only for the
correct size of wire.
Acceptable wire sizes are:
7 stranded 0.22-0.25mm²
Equivalent 24 AWG (7/32 AWG)
As you squeeze the connector closed, the tines of the
contacts bite through the insulation to make contact
with the conductors. Wire which is too thin will not
make contact. Wire which is too thick will damage
the tines.
You can re-open a closed connector by gently
moving the tabs at the sides of the top cover outwards
to disengage the latches while lifting the cover
slightly, one side at a time.
The pin letters show how the pins mate with the
‘features’ diagram.
White
White
Max
Min
Green - min
Blue - wiper
Red - max
Red - not used
Yellow - batt
Yellow - batt
Max
Min
Green - min
Blue - wiper
A
A
B
B
C
C
D
D
Green
Green
Yellow
Yellow
Blue
Blue
Red
White
1
Closed
D C B A
D C B A
Open
