When I press the brakes on my 2004 chevrolet tahoe, both of my interior turn signal indicators show dimly in the dash. We have changed all bulbs in the back light panels and verified the fuses. what else could be wrong?

Sounds like an indication of a burnt out bulb. Check the front bulbs

Sounds like a possible bad ground connection.
Make sure the contacts for the bulb are clean.
Make sure the cround connection is not corroded.

Was any of the brake light bulbs changed recently, the wrong type of bulb may be used causing a short in the socket, and making the rest of the brake and signal circuit malfunction. I no bulbs were recently replaced, start with checking for corrosion in each bulb socket, signal and brake bulb sockets. Let us know what you find

Bad earth on the wiring of either the stop lights or the indicator bulbs at the cluster

it could be a bad connection in the stoplight wiring most likely the earth wire check all the wiring connectors to make sure they are plugged in properly.....hope this helps.....cheers

I had this problem, and to be honest, it happened to the left side about a week later...it's the board that the bulbs plug into...it's a very common problem with this model. So popular that you can normally get the socket board off the shelf at a parts store! it's extremely simple to replace, and I replaced all the bulbs at the same time!

First thing i would do is chg. the break light switch, and make sure to chk. all grounds around tailights, sometimes if there is a ground problem it will travel back thru the hot wire to get a ground, witch in turn makes everything go wackey.

Pull the bulb out of both left side turn signals and check the filaments. As these are double filament bulbs, sometimes the filaments break and lay across the other creating a feedback issue.

the brake light switch. under dash behind brake peddle arm.

Igot the same problem on left side.The problem was the convertor for the trailler plug.