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Bosch Terminal Designations
thanks to Unca Joel Walker


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From Bosch Automotive Handbook, 3rd edition

Terminal Designations (Excerpts from DIN Standard 72 552)
The terminal designations do not identify the conductors, because device
with different terminal designations can be connected at the two ends of
each conductor. If the number of terminal designations is not
sufficient (multiple-contact connections), the terminals are
consecutively numbered using numbers or letters whose representations
of specific functions are not standardized.

Terminal Definition
-----------------------------------------------------------------------
IGNITION
1 Ignition coil, ignition distributor, low voltage
-----------------------------------------------------------------------
(Ignition distributor with two separate electrical circuits)
1a to ignition contact breaker I
1b to ignition contact breaker II
-----------------------------------------------------------------------
2 short-circuit terminal (magneto ignition)
4 Ignition coil, ignition distributor, high voltage
-----------------------------------------------------------------------
(ignition distributor with two separate electrical circuits)
4a from ignition coil I, terminal 4
4b from ignition coil II, terminal 4
-----------------------------------------------------------------------
15 Switched + downstream of battery
(output of ignition/driving switch)
15a Output at dropping resistor to ignition coil and starter
-----------------------------------------------------------------------
GLOW PLUG AND STARTER SWITCH
17 Start
19 Preheat
-----------------------------------------------------------------------
BATTERY
30 input from + battery terminal, direct
30a input from + terminal of battery II
(12/24 V series-parallel battery switch)
31 Return line to battery
- battery terminal or ground, direct
31b Return ine to negative battery terminal or ground, via switch
or relay (switched negative)
-----------------------------------------------------------------------
(12/24 V series-parallel battery)
31a Return line to - terminal of battery II
31c Return line to - terminal of battery I
-----------------------------------------------------------------------
ELECTRIC MOTORS
32 Return line
(Polarity reversal possible at terminals 32-33)
33 Main terminal connection
(Polarity reversal possible at terminals 32-33)
33a Self-parking switch-off
33b Shunt field
33f For second lower-speed range
33g For third lower-speed range
33h For fourth lower-speed range
33L Counterclockwise rotation
33R Clockwise rotation
-----------------------------------------------------------------------

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