Not starting after fitting new starter motor.

[RichieW]

Hey everyone, wonder if anyone can help me figure this out. Car was a pain to start, starter motor sounded slow. Just changed it today and changed the battery for a new one too, the starter motor spins and sounds faster, engine shakes but it's just cranking, wont start at all. Before I changed the starter it would eventually fire up but now I've just got the cranking and no start. Any help would be massively appreciated.

[NeilGo]

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[NeilGo]

Hi Richie, maybe double‑check all the wiring to the starter and earths. Sometimes when changing the starter, an earth strap or small connector gets missed or isn’t tightened fully and a bad earth usually means strong cranking but no start.

[JagRigger]

On both my Vectra and the wife's late Astra H, the main loom from the UEC had breaks in it