Q: Electrical problems after upgrades

asked by on October 18, 2016

I had no problems with lights working before I decided upgrade my OEM radio to the aftermarket head unit, speakers, subs, LED lights everywhere ( front, turn, tail, interior lights). Now I have weird situation with lights: 3rd brake light is always on, right side of my outside lights are not working, inside lights ( dome lights, instrument cluster lights, rear dome light) are out completely. Right turn light is working hyper flushing I did not install load resistor, but my left turn light is not working at all. What could it be and how can I fix it?

My car has 155000 miles.
My car has an automatic transmission.

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