What are the four wires on the ELR Power Supply? February 10, 2026 21:26 Updated What are the four wires on the ELR Power Supply? Answer The two white wires carry power. The two black wires connect to the feedback switch. Refer to the CM-150-08 Instructions for details. Applies To Apex 2000 (3R), Olympian & Reliant 5000 (4R) Related to ELR Apex 2000 Power Supply Related articles Electric Latch Retraction, ELR, Wiring Instructions and Specifications Electrical Products Installation Instructions LEEDS GreenCycle Certificates Precision 2100 & 2400 Series Rim Exit Devices What is the dogging key size and part number?