SHB 28Z3 EN – Edition 2.0 * 28z3s610.fm 6-3
Electrical system
Test lamp
The test lamp is used to test lines and functions with the ignition switched on.
• Line test (testing voltage):
Connect test lamp between test point (live cable) and machine earth or between test point
(earth line) and a live cable.
• Functional check (testing current):
Connect test lamp between a connection on the consumer to be tested and the connection
line.
6.3 Cable colour coding
6.4 Relays
Use, mode of function
Relays are used for switching electric loads (high currents) whereby the control power of
the relay coil is relatively low. Relays can therefore be controlled by microelectronics or
microswitches (e.g. touchpad keyboards, sensors). The switch contacts can be make-
contact, break-contact or changeover switches. These undertake the actual switching
function.
Zero-centre relay
86 = Start of coil (control line)
85 = End of coil (earth)
30 = Input (load line)
87 = Make-contact switch output (load line)
87 a= Break-contact switch output (load line)
Colour Code
Black blk
Brown brn
Red red
Orange org
Yellow yel
Green grn
Blue blu
Violet vio
Grey gry
White wht
Pink pnk
86
30
85
87
87a
Fig. 1: Terminal description on relay
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