Hi, my 2007 tdv8 has developed an annoying trait,it is completly unreliable to start!
Despite a new battery and a recent aux battery in the boot on occasions it just refuses to turn over fast enough to fire, this can be from cold in the mornings or after a 30 mile journey and a quick stop of minutes upon return to the car with its, still hot engine its just sluggish to turn over, fortunately I have a portable jump starter I carry at all times now to get me out of bother,which it always, does. I have a voltmeter on the dash reading 14.5v with engine running, so I'm assuming alternator is OK and when the jump starter is attached the car fires up straight away, so again I'm assuming the starter motor is OK? Does it sound like a bad earth or a cabling issue? I'd so
appreciate any advice, thanks.
appreciate 2008 L322 Vogue 3.6 TDV8 in Java Black with parchment and Navy interior. 125000mls.

I used to be indecisive and have a split personality... but we are ok now...I think?

Easy things first - battery terminals clean and tight? I’ve had to use a bit of copper between the clamp and terminal to get a sound connection

Earthing problem or as above power connection problem. Try a good clean of the terminals first as it’s quick, easy and free. There is nothing that can't be fixed with a hammer😜😜
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Thanks for your replies. Aside from the 2 cables from the battery, what others are there and where are they located? , I'm thinking body earth straps as one example.  2008 L322 Vogue 3.6 TDV8 in Java Black with parchment and Navy interior. 125000mls.

I used to be indecisive and have a split personality... but we are ok now...I think?