I bought this Bosch relay to replace the 20 year old original ignition relay on my 2000 ST4. Nothing wrong with the original but I wanted to refresh the unit. I used the Bosch part number from an old post on this forum. Fitted it today and nothing....dead. Pulled it, replaced with the original yellow which works fine. Put the new unit back, again nothing, pulled it and nearly burned my finger from one of the connectors, I think it was the vertical one marked '30'. VERY hot. What gives; is it a faulty unit or the wrong unit?