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Appendix 3 – Tach Electrical
Specifications
1) Bus power
– circular connector pin A (red) 12, 24, or 48 volt systems
a) Minimum - 9 volts
b) Maximum - 58 volts
c) Current draw from bus:
i) less than 0.5 amp (normal operating conditions)
ii) less than 1.0 amp (maximum draw with no-op internal alternator)
2) Tach
– circular connector pin F (blue)
66% 33%
0 volts
10
– 12 volts
2.2K ohm pull-up resistor