Gemini 105Mc Owner’s Manual
20
Copyright © 2004 Performance Cruising Inc.
Mast Wiring
After the mast is erected, the wires in the mast are
routed through a 2-inch tube. These wires terminate
in the roof of the master cabin and are accessible
behind a removable panel.
Mast wires connect as follows:
The coaxial cable for the VHF is screwed to the coax-
ial cable that terminates at the radio by the switch
panel.
The wire from the electronic equipment is con-
nected color to color either side of the connecting
block supplied. The ground wire is a few unshielded
strands of wire that should not be ignored, but at-
tached to connecting block as shown in the illustra-
tion.
There are 3 twin core wires coming from the switch
panel one labeled 'steaming' and the other labeled
'tricolor and spare'. These are attached to the con-
necting strip.
The twin core wire labeled 'steaming' has its individ-
ual wires labeled:
White:
Steaming
Black:
Ground or negative for all three lights up the mast.
The twin core wire labeled tricolor has its individual
wires labeled:
White: Tricolor
Black: Anchor (this is the only time a black wire is
live supplying power to the anchor light)
The twin core labeled spare only uses white for deck
light. (The black is spare)
From the mast there are two sets of wires:
1. Brown and blue from the steaming light partway
up the mast. The brown is the positive to the steam-
ing light and the blue is the negative.
2. Brown, blue and strip yellow from the combina-
tion tricolor and anchor light at the top of the mast.
The blue is the negative to both anchor and tricolor,
with the brown being the positive to the anchor and
the yellow being the positive to the tricolor.
3. Brown and blue from the deck light. Brown is
positive and blue is negative.
The wires from the Autohelm wind are connected to
the instruments through the connecting block.
Mast Wiring
Match the wires to their partners based on color
through the connecting block. Do not forget to
group together and connect the ground wire
strands.
Most of the 12-volt wires in the coax are under the
roof molding. There is little chance of failure with
the wiring except for the connections to the various
pieces of equipment. All the connections are acces-
sible.
The 12-volt wire used is 16 gauge 600º boat cable
wire (The 110 volt wires are 3 core and mainly un-
der the dinette).
Masthead Lights
The masthead lights are supplied with the mast
from Selden Masts. Selden has been known to
change the make of the masthead lights without
warning. At present (2004) , the light is an Aqua
Signal masthead light. The bulb specifications are
as follows:
Anchor Light: 10 Watt (Part SW40)
Masthead Light: 25 Watt (Part TDH40)