Great follow up questions!
So, the date placed in service on the first schedule C is irrelevant on YOUR Schedule C - you certainly can have a vehicle that is used in more than one business at the same time. For your business, you should have reported the vehicle for the first time in the tax year that you started using that vehicle for your business - regardless of if/when it was used in a different business. So for your schedule C, you would report the date in service as the first date that you used that vehicle for your business.
As for what amount you enter as the value, that is a little trickier. Normally your basis in a car for figuring depreciation is generally its cost. However, in some situations, you will use your adjusted basis (your basis reduced by depreciation allowed or allowable in earlier years). If you change a car from personal use to business use, your basis for depreciation is the lesser of the fair market value or your adjusted basis in the car on the date of conversion.
In your situation, you would calculate the vehicle's adjusted basis when it was placed in service in your business. Assuming you started using the vehicle after it was fully depreciated, your basis would be $0.
Finally, with respect to your wife's schedule C - you will want to stop depreciating the vehicle there as it is no longer used in that business. There is no transaction to report currently as you still own the vehicle; but in the year the vehicle is sold or disposed of, you will record a gain (or loss) on the disposition of the vehicle. In your situation, it should be a gain, as you indicated the vehicle was fully depreciated, so your adjusted basis in the vehicle would be $0.
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