I was told by a mechanic in the family that it was the turn signal switch in the steering column. Part is around $400 if I put it in myself - I decided to live with it for now since the blinkers actually work - I am so used to the noise now, I hardly notice it anymore.
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You could try changeing the fuel pump relay The fuel gauge signal come from the pump and goes through the relay to the gauge and on your vehicle the pump will still work even if the relay is bad it has a back up power system through the oil pressure sending unit . The relay is located inside of the glove box behind a panal its the one on the far left. I also have wiring schematic of the system but would need to fax it . If you want it get back to me with a fax #
Sounds to me to be a ground issue. I don't know how much of a machanic you are, but i think its time to take the bull by the horns and maybe fix it yourself. What you need to do, and you may get alittle dirty in the process and it might take a while is find every ground wire and strap( and hot wires too) check to see if there broke, loose, dirty whatever, start at the back around gas tank and work yourself forward. If you half to go to the dealers parts dept. and get a diagram of all the ground straps and ground wires for your blazer they will print you one out. Just sounds to me they want to take your money and not fix the problem.
Unplug the turn signal relay from the fuse box and start you engine. Does it still make that noise? If yes... Put the relay back in, that is not the problem. If No...Then the relay could be bad, replace it!