Operation and maintenance manual

QSB4.5 and QSB6.7 Alternator
Section A - Adjustment, Repair, and Replacement Page A-3
Three Wire System, Typical Alternator (Delco-Remy™)
Key Terminal Connected To
1 Blade number 1* Indicator light
2 Blade number 2 Voltage sense
3 GRD* Ground
4 R* Charge indicator, automatic lockout
system, tachometer**
5 BAT Battery
6 I* Indicator light
*Not all alternators have this feature.
**Provides voltage pulses at about one-half system voltage at a frequency of one-tenth of alternator rpm.
Typical Alternator (Bosch™ K1)
Typical Bosch™ K1 Wiring System
Key Terminal Connected to
1 D+ Electrical charging system status light
2 B+ Positive battery
3 W Tachometer
4 — Ground/assembly