Turn signals, hazard and wiper pump when active blow fuses

So took the chance an drove the stupid car to work, now car is telling me it is over heating almost red lined driving seven blocks. Since I forgot the password I had to create a new account just to reply. I have looked at the wiring diagrams and it is foreign to me. How do I go about testing the wired with a multi-meter? I just bought one have no clue how id use it for the wires though?

So after analyzing this a co-worker suggested I check the radio that was installed in august, so, I did. I found that original stereo had two grounds. One connected wrong. My ground was in wrong spot speaker wire where flipped I had a my rear speakers one connected correctly second was wire in front speaker with negative and positive backwards. It was the same with rear. I called the place that installed it and told them they did it wrong their response of course was that they didn't. But I re installed it using the mapping from original port and new radio. My signals are working and window washer pump noticed before I did this that when I turned on signals with heater blowing my engine and the heater lost power. These idiots had the power to the stereo running to my BCM fuse. So relocated to my cig lighter since I don't use that.
Now I know just install a radio myself rather then pay people to install it.

Ill be test driving it and making sure that it fixed later in the afternoon. Praying it is fixed cause I can't afford to keep fixing it. Working on getting a truck this car is too small.

Now that I some what seemed to bandage the stupid electrical I seem to magically over night blown a head gasket. Water has invaded my oil. My life is seriously messed up right now.