Krueger Crane Systems INC
4699 Colt Road, Rockford, ILL, 61109
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Trouble
Defective relay.
Cause
Burned out coil or bad contact
Corrective action
The Bosch relay has 5 marked terminal pins. No. 85 and No. 86 are connected to the relay coil. (85 and 86 are
interchangable, either 85 is hot and 86 is ground or 86 is hot and 85 is ground). No. 30, No. 87, No. 87a are the
contacts. Using an OHM meter you can check the relay. The OHM meter should read, with no power at 85 and 86 (coil)
a closed circuit, between No. 3o and No. 87a (normally closed) and an open circuit between No. 3o and No. 87
(normally open). With power at the relay the circuit is closed between No. 30 and No. 87 and open between No. 3o and
No. 87a. If the contact is not changing replace relay.
Relay Drawings
Wiring Diagram
Phone (815) 874-9402
Telex 25-74°9
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