Tachometer Wiring - Moderated Discussion Areas

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Author Topic:   Tachometer Wiring

Lyle g posted 11-28-2006 11:03 AM ET (US)
[Seeks information on wiring tachometer, particularly an OMC brand.]
an86carrera posted 11-28-2006 12:36 PM ET (US)
The blue [conductor] is for the light and black [conductor] for the (-).
Len
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)
Ground (battery -) BLACK
Tachometer pulse sender GRAY
To make the optional instrument light within the tachometer work, connect power, switched through (typically) the navigation lights BLUE
jimh 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
http://continuouswave.com/whaler/reference/wireColorCode.html
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.
Lyle g 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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Author	Topic: Tachometer Wiring
Lyle g	posted 11-28-2006 11:03 AM ET (US) [Seeks information on wiring tachometer, particularly an OMC brand.]
an86carrera	posted 11-28-2006 12:36 PM ET (US) The blue [conductor] is for the light and black [conductor] for the (-). Len
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) Ground (battery -) BLACK Tachometer pulse sender GRAY To make the optional instrument light within the tachometer work, connect power, switched through (typically) the navigation lights BLUE
jimh	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 http://continuouswave.com/whaler/reference/wireColorCode.html 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.
Lyle g	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.