Hourmeter; Purpose; How It Works; Testing - Toro 74161 Service Manual

ELECTRICAL SYSTEMS

Purpose

Hourmeter

The hourmeter keeps track of the amount of hours the
engine has been running.

How It Works

When the ignition switch is in the "ON" position, power
is supplied to the + terminal of the hourmeter from the
"A" terminal (orange wire) of the ignition switch. When
the engine is running, oil pressure closes the oil
pressure switch supplying a ground to the - terminal of
the hourmeter.

Testing

Connect B+ to the + terminal and ground to the -
terminal, the hourmeter should run.
Hourmeter Back
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