For $29/mo, we provide access to advanced level technicians who will answer your questions on any Macbook board related matter to the best of their knowledge promptly & walk you through how to solve your problem so you can deliver a working board to your customer.
Why don't compare the short resistance with the resistance to ground on all coils?
If none equal, then is safe to inject voltage.
However, start with 1V and set amp limit to max on lab PSU first.