A new alternator will usually fix these problems, if the slow starting/glowing was due to a battery weakend by a poor charging.

If it has been a while since the glow plugs were changed, you may need to look into this. It will make a difference if the glow plugs are old or faulty.

Good Luck,

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William
76 240D (W115) - 550K miles
78 300D (W123) - 200K+ miles