Part Numbers: JD331121 (12V) / JD332121 (24V)
Part Name : Relay Box

The relay box is a high strength thermoplastic enclosure that contains four relays mounted on a black plastic chassis. The relay box distributes battery power to the Telma in four stages, and is usually mounted on the frame rail between the batteries and the Telma. Battery power is connected to the relay assembly at the "+" terminal. When voltage is applied to terminals 1, 2, 3, and 4, their respective relays close. This switches battery power to terminals I, II, III, and IV respectively. The "M" terminal is to ground the relay assembly and dissipate the reverse voltage spike that occurs when each stage is deactivated. The "S" terminal receives battery power whenever any relay is closed. The relay box should always mount in a vertical position with the wiring coming out of the bottom. The relay box's design makes it a simple, effective and proven solution.


Document # Description
OC441051 Relay Box Spare Parts Catalog
TIL34040 Relay Assembly
TL135022 Relay Box Fuse and Contact Replacement and Adjustment
TIL35021 Relay Assembly Protective Diodes
TIL05074 Relay Box Modifications
TL105047 Relay Box Torque Specifications
TL101009 Maintenance Manual