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All gauges need to get
powered when the ignition key is on.
To find a switched ignition
(keyed hot) source, use your test
light or Voltmeter and check the
wire you have decided to use.
Ground the test light or voltmeter
to the metal chassis and check the
wire with your test lead. You should
have 12V+ with the key in the ON
position, and no voltage with the
key in the OFF position.
On this 2002 RAM the
wire pictured is the Black wire w/
Brown trace below the main wiring
block under the dash. Install
a wire tap on the wire. Notice
the in line fues assy. with a 5Amp
fuse. Here the 3 red gauge
power wires are connected to a
yellow male spade terminal.
The Yellow male spade term. is
plugged into a blue female spade
term. and then to the fuse assy.
From there it is connected to the
trucks ign. hot wire with a blue
male spade terminal that is plugged
directly into the red wire tap.
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