That t4 diode is probably in parallel with the relay coil and is similar to a 1n4148 small signal diode. It is there as a high voltage protection for the coil drive when the relay is triggered. It should show up almost as a short, since you measure through the coil of the relay.
edit: so if you measure across the coil and it is open with the diode, that the relay is fuxed.
The voltage at the rectifier is not normal. So you probably have a weird AC voltage on the bridge rectifier input, or the bridge rectifier is bad.
edit: so if you measure across the coil and it is open with the diode, that the relay is fuxed.
The voltage at the rectifier is not normal. So you probably have a weird AC voltage on the bridge rectifier input, or the bridge rectifier is bad.
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