Blinker fuse blows when turning on the blinker 1990 c1500

fuse blow to rear. (got old trailer hitch jack hacks?) <<???
wired up up by Larry the cable guy, ? we look act aft for wiring hacks. sure do rear.
1999 is first USA Silverado or is this car outside USA> not told
In usa it is Chevrolet C/K trucks
my wild guess is it a C1500 at
as told here,
https://en.wikipedia.org/wiki/Chevrolet_Silverado

read it and see how using wrong names gets wrong answers everytime.

C1500 1996
TURNS rear dead. (both)
I think the wires to the rear are cut. (or both lamps out happens)
or plugs on rear, loose or rusty or damaged.
USE a tool called a voltmeter to find the point of failure.
front to rear , turn switch to the rear. 12vdc is good , blow that not so good. for sure 0v. means dead. or say below 10vdc at any time
blinker turns go,0v, 12v,0v,12v repeats same front and rear.

What is the amp rating on the fuse that keeps blowing? I looked at wiring for stop lamps, 15 amp fuse. Unplug connector for stop lamp switch, see if the fuse still blows? Also see if anything at connector looks burned or melted.

You could have problem with fuse box, itself. Look at back side of fuse box, see if anything looks burned or melted.

The Compressor doesnt have a fuse. whats the issue

ok have your replaced any bulbs? i have found putting bulbs in wrong or just being a bad light bulb can blow fuses. try replacing all bulbs with new ones. its cheap and it could be the problem

short to ground in circuit

check the trailer plug wiring for a short or crushed wires

Is the coil connected to the ditributor? did you knock any connections off in the process? Does it turn over but not fire? do you have spark at the plugs? Are you sure of cylinder location in respect to firing order? Did you-and check this first as with any elec. problems-blow a fuse in the ignition circuit? good luck!

Sounds like a bad turn signal relay. located under dash on drivers side in fuse panel. If this does not fix the problem then you will have a loose or bad ground in the blinker system. Hope this helps. Good luck.

You should replace your break light swtich and it is located behind the brake.

Sounds like you have a Direct Short inside the Sterring Column. If you Tilt the Wheel you should get almost the Same Result. Not an easy fix, You will have to Pull the Steering wheel and Replace the Turn Signal Unit.