HOSE AS 6Y4056 - Caterpillar

An FT1808 Magnetic Input Adapter Cable can be fabricated for use with the 6V2100 Multitach. This cable can be used on engines equipped with a magnetic pickup which is used as rpm signal for an electronic overspeed switch or electronic governor. The cable permits a check of the engine rpm and alternator rpm.
To measure engine rpm on the multitach, connect the lug end of the cable to the magnetic pickup output signal lead for the magnetic pickup. Connect the plug end of the cable to the 5P7362 Magnetic Input Cable on the multitach. No ground connection is needed if the engine battery is used as the power source for the multitach. Use the number of flywheel teeth as the P/REV (pulses per revolution) number on the multitach.
To measure alternator rpm, connect the lug end of the cable to the "R" terminal on the alternator. Connect the plug end of the FT1808 Cable to the 5P7362 Mag Input Cable that is connected to the multitach mag input. This method gives the alternator rpm which is a ratio of the engine rpm. See the chart for the P/REV numbers for the specific alternator to be checked. Additional information to check the alternator "R" terminal output can be found in the Electronic Monitoring System (EMS) Service Manual, Form SENR2945.
Drawings of the FT1808 Magnetic Input Adapter Cable are available from your Division Service Manager.