And, put a volt meter across the battery posts to confirm that the glow plugs are pulling measured voltage down. I was having charging issues and Autozoo wanted to condemn the alternator when in reality the voltage regulator going and battery was bad. The VR was a $30 problem vs $100+ for an alternator. I found a Blem battery for $20. Too bad the battery guy has retired.

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85SD 240K & stopped counting painted, putting bac together. 84SD 180,000. sold to a neighbor and member here but I forget his handle. The 84 is much improved from when I had it. 85TD beginning to repair to DD status. Lots of stuff to do.