5. Other Key Points
• Remember that the only signal that will prevent the field LED from lighting on the relay board is the tach signal
from the blue wire. The console must receive an rpm signal to activate the field current to the alternator that is
PWM controlled.
• If you suspect the alternator, disconnect all the wires and check the resistance across the field terminal and the
alternator housing; a typical Alternator should read around 4 Ohms or higher.
• The Field LED on the relay board will flicker at higher speed levels. This is the PWM signal from the console to the
field terminal of the alternator to control resistance / speed. If you experience full resistance through all levels
and the field light doesn’t flicker; replace the console.
● To verify that the load resistor is working correctly, you must ohm the resistor out using your multi meter. The load
resistor must read above .5 ohms. If the resistor reads anything less than .5 ohms, then replace the load resistor
(SM24989).
• Always perform mechanical troubleshooting in addition to electrical trouble shooting for resistance problems.
Last revised 10/5/15
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