Radio on Toyota 4runner will not turn on we put in another radio and tested it and it worked fine then we put everything back together and now it will not turn on

check make sure your dash light intensity isnt turned all the way down,if not then you will have to replace radio.

radio? you mean it wont play,

engines start.

the radio has many modes, Radio Am/fm both dead. how about the other features, like cassette, or ???? others, it might have.
stock radio? or not.

Look for a pinched wire on the radio. Sounds like you blew a fuse when you put the radio back in.

I am having the same issue! How did you resolve your problem?! ANY advise would be greatly appreciated!

you probably moved the distributor out of the proper timing

did u check the fuse box under the hood?

Sounds like you need the memory wire hooked up.

If the memory wire is Not used, you will get 1 of 3 things,
1 no Sound.
2 no Info, Like the Clock or Station
and 3 "IF the amp is wired Right" you would send the power Backwards to the radio.

Not to mention the voltage for the Amp Trigger is 12+ volts Just low Amps,

So you could wire Just the Radio With 1 ground, 2 hots And Ground the Radio Case, INcase the Radio is using the Ant as a Ground.

Hope this Helps.

On a 2000 4Runner, there are two fuses that control the radio. They are:
15 amp ACC
and
15 amp DOME
If both fuses are good, you have an internal issue in the radio assembly.
The graciousness of a FixYa rating would be greatly appreciated.

Have you checked the fuse? Looks like ther is no power coming to the radio so best bet it's the fuse.
Cheers.

check your asd relay or fuel pump relay