STEPRACE: Service & Maintenance Manual - rev. 1.2
Page 2.3
• Alternator interface board
name type of connector connection
CN1 AMP MATE-N-LOCK 15-pin F. to CPU board
CN2 AMP MATE-N-LOCK 6-pin F. to alternator
CN3 AMP MODU I 4-pin M. to power supply
CN4 AMP MODU I 8-pin M. to serial ports
2.5.2. WIRING
ST-1: Internal connecting cable
CPU Board – alternator interface board
CPU board
CN1
Signal Color Alternator
interface board
CN1
1 +12 Vdc White 1
2 +5 Vdc Black-Gray 2
3 ground Black 3
4 ground Orange 4
5 Alternator RPM X 6 Pink 5
6 PWM alternator resistance Red 6
7 - - 7
8 Selection knob position Black-Blue 8
9 CTS Blue 9
10 Master – Slave selection Purple 10
11 Y – bus Green 11
12 Z – bus Brown 12
13 -12 Vdc Yellow 13
14 A – bus Orange-gray
14
15 B – bus Yellow-
green
15
On some machines, the signal designated +12 Vdc in the above table is actually 10.5 Vdc.
ST-3: High voltage power supply
Power input socket – Power supply
Power entry Signal Color Power supply
CN1
Yellow Faston Ground Yellow 1
Red Faston Live Blue 4
Red Faston Neutral Black 6
The above description of cable ST-3 is simplified and does not detail the ground node connections.
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