radio fuse problem

Well that sucks !

I am assuming that you did remember to put the radio fuse back in in the engine bay ?

When you take a look at my wiring there is a green wire but it dissapears inside some black tape.


it is from the taillight fuse and goes to the clock but it does not show it connecting to the blue
and yellow wire which I included


So I'll have to go out and find a spare harness or tear appart one of my celicas to find out what the .... is up with that green wire

 

Well I would not now connect the green wire to the gray wire.

If you want to make things work I would reconnect the green wire to the blue and yellow wire but
attach it with a switch so you can shut it off. that way you don't have to keep removing the fuse
from the engine bay.

For some reason your blue and yellow wire is not providing 12 volts to your stereo. If you have a
voltage meter you should check and see if your blue and yellow wire is 12 volts. If you don't have
a meter use a 12 volt bulb.

Also test your green wire it should also provide 12 volts.

 

So I found an unmolested harness and its kind off a good news bad news scenario


Bad news is the plug has a green wire


Good news is the green wire is not used, their is actually 3 wires that are not used


I can explain why it has a green wire by looking at the wiring for the clock
L-Y blue wire with a yellow stripe maintains the clocks memory
W-B white wire with a black stripe is clocks ground
L-R blue wire with a red stripe turns clock on when key is turned
G green wire dims clock when lights are turned on
So the reason the radio has a green wire is to dim the radios display at night


Here you can see the green wire from the taillight circuit but it should only be 12 volts if the
taillights are turned on

so in this case 12 volt power should only be leaving the circuit to go to the clock if the relay is closed
instead 12 volts was going into the circuit via the blue wire with yellow stripe constantly because it was
connected to the green wire


The reason your taillights were allways on before was because the blue and yellow wire was
providing 12 volts to the taillight circuit causing you to remove the radio fuse to turn your
taillights off.

I do understand what is wrong I don't know if I have explained to well

So test the
-blue wire with yellow stripe
-test the green wire
-check the radio fuse in the engine bay to make sure its not blown !!!!!! if you don't have 12 volts on the blue wire with yellow stripe the fuse must be blown

 

i follow ya dave. that's some fine investigative work.

 

Bingo!

Just recently I have found two radio harness adapters in the junkyards. These allow installation of a new stereo without cutting the factory plugs. They are cheap cheap cheap on eBay too.

 

I'm prob too late but I just kind of skimmed through the thread to say that your dimmer circuit was prob wired in to your radio harness to be hot. I wouldn't go back to those guys if I were you. Any more wiring issues come see us first