Check the starter solenoid wire on the firewall, it's a purple wire
going to a jumper block below the battery if I remember correctly.
It's common for the connection to corrode, giving you intermittent
starter operation.
Loose engine ground and ignition switch are the two common things
between glow plugs and starter.
Also make sure the main bus line from the positive cable at the
starter is actually attached. It slips up into the cable cover when
the cable is removed, and sometimes doesn't get re-installed as a
result. Usually causes all sorts of other electrical gremlins though,
as it' supplies the power to the fuse box and keyswitch.
Peter
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