Sealey ta131 relay tester sealey ta131 p this relay rester from sealey is a health test for 4 and 5 pin electro mechanical relays commonly found on modern vehicles test feature will cycle the relay ten times testing the resistance contacts and consistency within each cycle if a cycle fails on the test then this will be indicated by a red led and alternatively a green led if relay works p sealey ta131 relay tester