Ford Repair Questions? Ask a Mechanic for Answers ASAP
Before you do any repairs to anything on a Hybrid vehicle, you need to check for trouble codes in the vehicle completely, all the modules. Probing wiring on hybrid circuits can be deadly, very high voltage is contained in the orange taped wiring for the hybrid systems. Please check for trouble codes first. You will need a scan tool to check for these trouble codes, not a code reader.
Have you tested the actual engine battery that starts the engine? The Hybrid battery does not start the engine. If the actual engine battery is bad, it will not start. The alternator only charges the engine battery. See the pin point tests below for diagnosing your starting problem.