Won’t turn over

Did the old starter test ok in bench

Yes I have the starter Earth to the chassis, it’s the actual battery Earth I think is causing the problem now, where is the best place to bolt that Earth . The old starter did spin on the bench but not as quick as the new one.

CRS said:

Yes I have the starter Earth to the chassis, it’s the actual battery Earth I think is causing the problem now, where is the best place to bolt that Earth . The old starter did spin on the bench but not as quick as the new one.

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Bolt it to the block somewhere along with the battery tray and front radiator panel, that's what I did.
Make sure the cable is good, heavy enough and everything is clean.

Ok thanks, I’ll have a look when I am next able to

ditto clean and shiny

Best to fit a new wire and earth clamp to battery with good connection to a block bolt.
I have known old cables to corrode inside the sheath creating a resistance.
Had similar issues with my 2a last year only in this case it was the positive cable.
After renewal I opened up the old cable to find that several inches of wire near the batt terminal had turned to black crud.

just had a look again today and the only place the Earth lead actually works is under one of the bolts on the rocker cover, it starts every time and hits over fast.