Just like it says on page 2 of the Instruction Manual

Connections

1. Fasten a 25 pair female amphenol ended cable to the unit and terminate all leads on a 66 type block
2. Strap A ground, B ground and lamp ground audible signal ground common at power supply.
3. Refer to Figure 1 for connecting block layout and connections.
4. Refer to Figure 2 for connections to 1A2 Key Systems.

Dean
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