'77 240D Can't start it

[adamkat22]

my first car and i'm learning a lot so bear with me. i have a 77 240D that we just swapped engines on. aside from needing a jump start it drove home fine. then wouldn't start again. glowplug strip fuse was blown, so i replaced that expecting it to be solved. no luck. i turn the key and all i get is a painfully slow rolling wheeze. not even a cough or a hiccup. took the gp's out and manually tested them with a battery and they all turned orange. whats my next thing to check? thanks!