W123 Glow Time

[1983/300CD]

Happy Tax Day. My glow plugs burn for a good 2 seconds when first starting out on a regular 65° morning. It starts fine and I consider that normal. But when it's cold outside, the plugs glow for about .5 second and I have to cycle them 2 or 3 times to make sure it's warm.

Is this a relay issue? Surely somebody else must have experienced this too.