change alternater first, then ecm blowed
It is in the fuse box. It will be a red 10 amp fuse.
It being an American vehicle
There is a short in the wiring or in the bulb. Try changing the bulbs first.
Assuming the heater works fine, you have a short, probably in the AC compressor clutch.
You have a bad fuel pump or the wiring to the pump is shorted to ground somewhere.
The fuse that controlls the fuel pump relay and primes the engine on start up on a 1995 s 10 blazer with the 4.3 cpi engine is located in the drivers side fuse panle and is labeled ECM # 2 it is a 20 amp and is in the third row up and right inback of ECM # 1
the blower motor should be either on the passenger firewall or in the passenger floorboard below the dash
Not a good thing to do! If you are blowing 10 amp fuses, you have a problem with that circuit. Putting a 30 amp fuse in its place can do more damage.
There are multiple reasons, most likely you have a damaged wire somewhere. Because you know the fuse you can track the wiring around that fuse. Test for the ground.
you may want to check for a loose ground or an open wire that keeps touching other wires or your frame..-Shocker
A 3 amp fuse sounds pretty small for that application. I would suggest at least a 5 amp, and probably a 10 amp.