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Black wire always to negative terminal
DC Battery Connections
White wire always to positive terminal
DC Connections
Black wires identify negative or hot wires. Switches connect on negative
side of battery to the load (light).
White wire is used to identify the
positive polarity. Black
SwitchWhite
This type of miniature lamp socket has a brass colored screw and a silver screw. Black wires will connect to brass and
white wires connect to silver.
Red wire is also like black and can be
used to identify the negative side or switch side of a
circuit.
This is a 3-way circuit. Red and black wires are used to identify the path of current and are on the negative side.
RedBlack
Black
WhiteBlack
3-way switch
Black
This is a 3-way/4-way circuit. Red and black wires are used to identify the path of
current and are on the negative side.
The lights are in series. The black wire in between the lights could also be red.
4-way switch
AC Connections Wiring a 3-way switch
Wiring of a 3-way switch using 3 conductor Romex cable. This is an
exception where white can is terminated on the switch and is a
HOT (live) wire!