1996 Johnson Evinrude "ED" 40 thru 55 2-Cylinder Service Manual, P/N 507124, Page 291Get this manual

1996 Johnson Evinrude "ED" 40 thru 55 2-Cylinder Service Manual, P/N 507124, Page 291

Tachometer Circuit Tests12-Amp Models Perform the following tests if the tachometer does not operate lNote The tachometer
the instrument harness gray lead and black lead at the dash If voltmeter shows volt, go to Step If voltmeter shows any voltage,
replace the rectifierregulator4With the engine running at 1000 RPM, check for voltage between the instrument harness gray
lead and black lead at the dash If voltmeter shows volt, go to Step If voltmeter shows less than volts, leave the voltmeter
connected to the boat harness gray lead and go to Step If voltmeter shows more than volts, replace the tachometer5With the
engine NOT running and the key switch ON, check for battery voltage at the terminal board purple connection If voltmeter
shows battery voltage, replace the rectifierregulator If voltmeter shows NO battery voltage, check instrument harness and
engine harness purple and purplered circuits, engine fuse, and key switch6With the engine running at 1000 RPM, disconnect
the tachometer and observe voltage on the instrument harness gray lead Voltage should increase about voltDisconnect the VRO