Tahoe Electrical problems aftermarket stereo

I had an aftermarket system installed when i bought the truck. I took it in today to have a speaker in front door replaced and an amp installed to run to the front 4 speakers and while there i decided to add rear view camera and radar detector hard wiring.   got truck back before dusk, we talked for 15 mins about other stuff because i turned up system and was impressed then we made small talk about radar detectors andi had to leave.  I got less than a mile away and my abs light came on and then my brake light started flashing and dinging.  restarted truck 4 times with same results the whole way home.  i have a 2001 chevy tahoe 4 x2 5.3liter engine.  kenwood ddx719 head unit.
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arnoldCommented:
Not sure what you are looking for, they likely tapped into the incorrect set of wires. Turn off the amp/radio and see if the issue goes away. Same with the camera/display.

The flashing brake light on the display?  Counting/recording the pattern could help you diagnose the cause if the prior do not resolve it.
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Michael-BestCommented:
This happened from after you had the wiring work done, so there is no doubt that it is caused by faulty installation of the accessories.
Take it back and get them to resolve the issue.
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