85-m1028

If you have a volt meter set it to ohms and put one point on the glow plug spade and one point on the side of the plug "the part the socket goes over" it should read about 1.5 ohms. If you get no reading then its probably dead plug, I wouldn't worry about breaking the connector that attaches to the spade of the glow plug you can get new spade connectors at the autoparts store cut the old one off and crimp on a new one 1/4" should work for most plugs, just make sure its insulated.