Electronic Specialties introduces the No. 190 Relay Buddy Automotive Relay Tester to provide an indication of the general health and function for most common 4/5 pin automotive relays. Relay Buddy cycles the relay several times while loading the contacts to detect any excessive resistance, and watches for consistency in every test cycle. Uses the vehicle's 12V battery as a power source. Test results displayed with a green light mean the relay is good; a red light means the relay is bad.