They do "overcharge" on Ford/Jag due to temp and high discharge on starting etc and ecu controls this and you will see 14/15 1/2 volts when cold,also needs silver calcium battery or voltage will fry normal battery.
Cost : Little as possible.
Thanks : To those who by their generosity my build has progressed.
Its a handmade sports car not a flaming kit car !!!
If at first you dont succeed,avoid skydiving...
No parachute require to freefall,only if you want to do it twice.