Problem: Doesn't want to cold start?

Ford Escort 1.3 in question dowsn't want to cold start, battery was changed, battery signal light is on, and starter won't turn, but when connected to
the other car with wires it starts, what could that be?
Some mechanic sais that it is because of bad diodes in alternator? Can that be it?
How much do these diodes cost?
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Mickey opined in

no... you havent given enough info
was the battery run down previously? diodes would run down the battery to nothing
Do the lights dim greatly?
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No, it had about 9.5 V.

No.
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Mickey opined in

Sitting, that is pretty low.
First thing you need to start off with a charged battery. Then clean and tighten all connections between the battery and starter. incuding ground cables.
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