Started overheating replaced thermostat now there is no power

We need to start with going back over the job that you just did and make sure nothing was left off or loose. Here is a guide to help you step by step with instructions in the diagrams below to show you how on your car.

https://www.2carpros.com/articles/engine-overheating-or-running-hot

Check out the diagrams (Below). Please let us know what happens.