86' SDL No Glow plug light. Did all the checks on the relay and Battery voltage and time out and its ok. Then did the continuity test on the plugs through the connector, and 5 when to infinity and one was dead (G3). Seems to indicate that's the bugger. Only thing is, some say that ohms should read about 1.5. when checking resistance. My test promptly went out to infinity on all scales on the 5 plugs. What's the deal ??