Replaced 4 of the 6 glow plugs. For the first time the glo plug light on the dash came on for 2 seconds. The car wanted to start and caught on. Ambient temperature was 60 degrees. I was elated and went to do my errands. This morning and the temp is about 50 degrees no glow plugs seemed to be working. I checked the glow plug relay and the fusible link is melted. I dont show any of the wires to be grounded to the glow plugs. What next? Could it be a bad fusible link and where do you buy them?