91 chevy s10 blazer fuse issues

I would suggest you take it to a Chevy Mechanic/Dealership. This maybe a common problem inherent to this make/model. Sounds like a relay issue. Various recalls were issued for this make if I recall. Always good to have the dealer check those.

Hi there:
Check this on 1998 Chevrolet S10 Blazer Car Stereo Radio Wiring Diagram:

Car Radio Constant 12v+ Wire: Orange
Car Radio Switched 12v+ Wire: Dark Green
Car Radio Ground Wire: Black
Car Radio Illumination Wire: Gray
Car Stereo Dimmer Wire: Violet/White
Car Stereo Antenna Trigger: N/A
Car Stereo Amp Trigger Wire: N/A
Car Stereo Amplifier Location: N/A
Front Speakers Size: N/A
Front Speakers Location: N/A
Left Front Speaker Positive Wire (+): Tan
Left Front Speaker Negative Wire (-): Gray
Right Front Speaker Positive Wire (+): Light Green
Right Front Speaker Negative Wire (-): Dark Green
Rear Speakers Size: N/A
Rear Speakers Location: N/A
Left Rear Speaker Positive Wire (+): Brown
Left Rear Speaker Negative Wire (-): Yellow
Right Rear Speaker Positive Wire (+): Dark Blue
Right Rear Speaker Negative Wire (-): Light Blue

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The radio should have a wire that connects to the dash lights to light up the face at night. I'm guessing that's shorted out

the dash sound's like a fuse, check the fuse box under the hood and in the door jamb on the side of the dash, also check your fuel filter and fuel pump, im betting on the pump because i have a 2001 chevy blazer that has had two replaced and it has 233000km on it!

the diagram is on the panels that cover the fuses take off the fuse door on the inside, driver side on the dash board you have to open the door and look inside on the other side of the door and its the same with the relays in the engine compartment but the radio shouldnt be under the hood i know i have a blazer

You have obviously damaged neighboring wiring in the fuse panel. The reason the dash lights and radio is pulsing is because of feedback.

Your dash needs to come out. These bulbs push into a plastic piece that "twists" into the back of the dash board. (About a 1/4 turn) Unless you can get at them from underneath, but I think it's to tight.

The 2004 Trailblazer has two fuse panels, one in the under hood and one under the middle row seats. The radio fuse is marked RADIO fuse # 41 and is a 15 amp fuse located in the rear fuse panel. To access the rear fuse panel flip the seat behind the driver to the upright position, under it you can see the fuse panel and a diagram should be on the under side of the cover. 

Good luck and hope this helps.

this got easy after a while 2 ways, i had friends who would not take the time to spend 8dollars to buy a harness connector for a new cd player and would splice everything together like takeing the red and yellow wires and connecting them all together as one. this drains ur battery unless ur cd player can completly power down by the power button not all do... but keep this in mind on GM cars the 2 wires of the same wires like purple the one with a black stripe is ground they go together stripe on stripe also there is 2 extra wires one is ORANGE and BROWN u dont need these dont even mess with them even if u have a connector block them off THESE TWO COLORS IS FOR FACTORY STEREO IF SO THESE WIRES CAN AND WILL MAKE IT SO U DONT HAVE DASH LIGHTS so always buy a connector ond dont mess with these wires block them off and dont ground them out.

sounds like a short or your light switch is grounding out