1983 300SD Glow Light Stays On

3 months ago I replaced all my glow plugs and used the reamer tool to clean out the carbon build up.

3 weeks ago the glow light stayed on after the engine started. I stopped twice on the way home to kill the engine and restart it.

3 hours ago my glow light mostly stayed on and I hit every green light on my commute. So I didn't stop and restart the engine. By the time I got home the battery was almost dead. Now I'm charging the battery and wondering about tomorrow.

Also, in recent days this car has had very little power when cold. Makes a noticeable difference to turn off the heater. Fine once warmed up.

Any ideas? Thanks.

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