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.
Who is Participating?

[Product update] Infrastructure Analysis Tool is now available with Business Accounts.Learn More

I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

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.
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.

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today

From novice to tech pro — start learning today.