Altransit wrote:The Yuasa is a replacement, originals would have both been Ford batteries of identical size. It's the aux battery that's been replaced as they often fail first, but that means that the starter battery is probably over 6 years old
Airthies wrote:The four terminals are identical which would suggest it's from factory like that, and Als comments re different batteries I would agree. The plugs with two wires attached to the earth terminals (on the right of your pic) would suggest that you have a smart charging alternator and require a B2B charger instead of a split charge VSR.
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mcbutler wrote:Thanks for the info Al, when you say 'aux battery' is an aux battery the same as a leisure battery i.e. is the main battery protected if the aux battery is discharged??
Altransit wrote:mcbutler wrote:Thanks for the info Al, when you say 'aux battery' is an aux battery the same as a leisure battery i.e. is the main battery protected if the aux battery is discharged??
The aux battery alone powers all the electrics when the engine isn't running (lights, radio, central locking, etc) so the starter battery is protected from discharge.
Both batteries are connected together, via a heavy duty relay in the fuse box, for starting and charging, so the aux battery can't (or shouldn't) be an actual 'leisure battery' because those are not suitable to be used for the high current discharge of a starter motor.
Ideally, both batteries should be the same, and of the Silver Calcium variety
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