Moderated Discussion Areas
ContinuousWave: Small Boat Electrical
|Author||Topic: Tachometer Wiring|
posted 11-28-2006 11:03 AM ET (US)
[Seeks information on wiring tachometer, particularly an OMC brand.]
posted 11-28-2006 12:36 PM ET (US)
The blue [conductor] is for the light and black [conductor] for the (-).
|Tom W Clark||
posted 11-28-2006 07:20 PM ET (US)
Strictly speaking you only need three wires to make a tachometer work.
Power (battery +) usually switched through the ignition switch. PURPLE (VIOLET, if you prefer)
To make the optional instrument light within the tachometer work, connect power, switched through (typically) the navigation lights BLUE
posted 11-28-2006 09:46 PM ET (US)
The general color coding of the wiring used by OMC is given in an article I wrote for the REFERENCE section. Please see
Marine Wiring Color Codes
for guidance on wiring color codes.
The general arrangement of an outboard engine tachometer will be to have terminals with the following legends, uses, and associated wiring:
I = ignition, a +12 volt source which is provided by the ignition switch when in the RUN or START positions; the VIOLET conductor
G = ground, the 12-volt common or battery negative; the BLACK conductor
S = sender, a half-wave rectified signal from the engine's battery charging winding; the GRAY conductor
L = lamp, often supplied via a switch and in common with other instrument lighting; a source of +12 volts to illuminate the instrument; the BLUE conductor
Some OMC tachometers are wired directly to a harness with a connector. The connector mates with a matching one in the remote control wiring harness.
posted 11-29-2006 08:41 AM ET (US)
thanks every-one use heat shink connectors made all the connection,works great.I'am guessing the last time it was hooked up was in 1995.
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