Green Light = relay is good; Red Light = relay failed. Insert the relay into the correct 4-pin or 5-pin slot. ✅ Universal for 12V Car Relays – Compatible with most 4-pin and 5-pin automotive relays.
Professional 12V 24V Automotive Relay Tester 4-Pin 5-Pin Circuit Diagnostic Tool
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12V 24V Automotive Battery Tester Battery Load Tester Charging Cranking Analyzer
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12V 24V Automotive Electrical Circuit Probe Battery Tester Diagnostic Scanner
