I have a 98 blazer - the issue I am having is with the rear drivers blinker. It continually blows fuses. I have gone through changing out the turn signal switch as well as the lights. I unplugged the light assembly in the back and tried a new fuse - it blew again. What color is the blinker wires coming out of the fuse panel and from the rear light assembly? At this point I am about to run new wires all the way back from there to get it to work. Any help would be great.

 

Take a very close look at the socket. They can go bad and it's not easy to see the pins/connections are shorting out.

 

Thank you 1998MSO, I unplugged the rear taillight assembly itself from inside the frame and tried a new fuse - which it blew. I will replace the sockets themselves tomorrow, but I find that it may not help. I have a feeling its the power wire(s) from the turn signal fuse back to the light, but I have no idea what color that wire is. I know it could possibly be a ground too, but as far as I know there is only 1 ground for that light and the wire seems to be fine.

 

Sounds like you have a wire grounded out in the harness.

 

Does the fuse blow when you use the stop lights? Stop lights and turn signals use the same filament in the bulb, and the same wire, from the multifunction switch to the socket. The wire is dark green with a white stripe from the multifunction switch to the fuse. From the fuse to the socket it's dark green.

 

I appreciate all the input. Thank you captain hook for the color code of the wire. The only time the stop or hazard fuses blow is when I insert a 15-20 amp fuse in the turn signal fuse slot instead of the required 10 amp. As you know both those fuses take 20 amp fuses. Figured it was something more for me to try. I will be trying to replace that dark green wire today and pray that this resolves the problem. Other than the dark green, is there any other wires I should consider looking at? As I stated before, I believe there is only 1 ground wire for the rear lights and I found it near the rear drivers tail light (which is in fine shape).

 

The reason it calls for a 10 amp fuse is so the 4 way fuse won't blow if there is a short in the T/S circuit, (the 10 will blow first). It also makes it easier to find the short. Your short is between the T/S fuse and the socket in the dark green wire.

 

There is no dark green wire for the LH Turn. I did cut the yellow wire for power from both the fuse panel and the light assembly to that side and spliced a new wire in on the outside of the truck to see if that power wire was the problem. It wasn't. The colors for that side are black, brown, light green for parking lights and the yellow. The yellow says its for the LH Turn. Any other ideas?

 

My mistake, sorry. You're correct, left rear turn/stop is yellow. Dark green is for the passenger side.

Make sure you have the correct amp fuses installed, then remove both of the left turn/stop bulbs and see if it blows the fuse.

If the fuse does not blow, the problem is in the tail light assembly: either a bad socket or a bad bulb.

If it still blows fuse #15 10 amp fuse with the turn signal, but not with the stop lights, the problem could be in the multifunction switch. The stop lamp switch supplies voltage to the multifunction switch. Circuits inside the multifunction switch split the stop lamp voltage signal and supply voltage through the same yellow wire to fuse #15 10 amp fuse and then to the stop/turn filament. It's possible that the left turn circuit in the multifunction switch is shorted to ground.

 

I have replaced both the multifunction switch as well as the harness assembly. All the correct fuses are in there places. I'm at my wits end with this and unfortunately going to have to take it in if there is no solution. I do appreciate you taking the time to answer me. I just can't think of anything else it could be. If someone comes up with something I will be checking this site this weekend. Come Tuesday - its do or die...... lol.