Tail lights tail light fuse keeps blowing out just installed after market stereo now no tail lights

fuses blow because of dead shorts or excess current draw
to blow a 15 amp fuse indicates a dead short
by disconnecting the rear lights , the problem is in something else you have replaced
could be a problem in the head light wiring

obviously it may have to do with the installation of the new stereo, while installing some fuse may have blown or wires are cut or wires were not put back in order.

you could have blown some fuse while installing the stereo. check the fuses, wires that may have been cut or disconnected.

make sure the stero ground isn't hooked to a tail light wire,if the lights are off the wire will appear to be a ground.

Get a wiring harness connector for your 1998 GM car - THEN carefully follow each wire color on the harness. Do NOT connect anything to the GM orange wire except "Memory". Do NOT connect anthing to the harness for "Lights" or "Dash" or "DIM" - you will blow fuses. Only connect the Power, the memory and the speakers - period. Then you'll be safe.

the tail light issue could be just bad bulbs, check them with a meter ,, also, check the sockets for power to each contact point,, normally if the brake lights and flashers are working, the tail lights should too,, as far as the dash lights have you installed an after market stereo? If so a common problem is a wrong wire got grounded,The harness from the car to the factory radio has a wire for the dash lights that shows up as ground with the light off. When the lights are on the wire is 12V+. Check to see if you connected the ground from the new stereo to this wire. The radio will work perfect but everytime you turn thr park light on the fuse will blow...and the radio will continue to work. There should be a ground wire in the harness as well, ensure you connect the ground from the new stereo to this wire. there is a 15 amp fuse that blows, check them with a meter rather than by sight

There is a wire that runs to the radio to light it up at night, the illumination wire. That wire is also hooked up to the same circuit that the tail lights get power from. If you wired up that illumination wire to the wrong wire on the radio, that will cause it to blow the tail light fuse as soon as you turn on the lights. Double check your wiring, or check to see that the illumination wire is not grounding itself somewhere behind the radio.

91 honda accord lx, fuse keeps blowing for tail lights. changed rear bulb sockets but still, same problem. fuse blows soon as i turn on the park lights. what can be the problem?

where do you have the power wire for stereo hooked or hooked into?

Consider what you have changed when stereo was installed. Using existing wiring is not like it used to be. The electronics has changed that. Going from fuse block is not a good thing.
Try undoing and examining wiring for damage and consider routing from battery. Cables are available for extra wiring from the battery.