1995 Johnson/Evinrude Outboards 25, 35 3-Cylinder Service Manual, Page 245Get this manual
Tachometer Circuit
INote Verify that all engine and boat wiring and connectors are in
good condition
1Disconnect the purple lead between engine wiring harness and rectifierregulatorSet peak-reading voltmeter to "POS" and "50"Connect the meter red lead to engine harness purple lead and meter black lead to clean engine groundWith the engine not running and the key switch in the "ON" position, voltmeter must show battery voltage If the voltmeter shows battery voltage, reconnect the purple leads and go to Step If the voltmeter shows less than battery voltage, check the engine and boat purple circuitDR6035