| Relays can be deceptive buggers that check OK on the bench but that can be a false +. Recently had an issue with the starter relay that appeared to check out OK on the bench but failed under load. Relay types are normally open, normally closed and a combination of these. They all have an input coil (electromagnet) side and an output supply side for power to the appliance like a starter. Repair manuals say check for continuity across the coil side then apply 12v to the coil side and listen for the click of the contacts on the supply circuit side. From my experience a click is not conclusive because the contacts could be burned but still click with 12v a false +. However that is still not conclusive because that test is not passing the amps that the circuit requires to operate the appliance. If all relay tests are OK and all else checks out in the total circuit but appliance still does not operate the relay is no doubt bad. Of course the quick way if you have spare relays in your supply just try it and if it works you are done. Relay operation 101 [ http://www.explainthatstuff.com/howrelayswork.html ]
ZUL8TR in Orlando,FL |
