2001 windstar

it wont start or turn over the same thing happened one yr.ago today at that time i had it towed to the dealer it cost me over $700 to have it fixed.it was a one way diode costing six dollars the rest was labour.i had a mechanic check it today and he thinks its an electrical problem maybe the same as before.but he needs a schematic does anyone know where i can find one?
all help welcome.
thanks.

If you plan to hang onto the vehicle, a subscription to Alldatadiy would be worth the investment.
They have electrical diagrams there......as well as the rest of the factory service manual.
They also update with the TSB's.

my mechanic found the problem it was a dirty diode in the fuse panel.

haynes manual has one in it