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Question edited for a lot more clarity.
Question moved to model category.
It might be the flasher relay and it might be the horn relay although horns tend to seize up through lack of use. the flasher relay is is separate to the Hazards relay which is often part of the switch.
You have a direct short to ground on that power feed circuit . You need to find a power distribution diagram to see what all gets is power from that fuse . Isolate the circuits till the fuse doesn't blow any more , then trace out that circuit that blows the fuse .
Which Ignition fuse ? Which fuse box is it in ? under hood , passenger compartment ?
IGN A
40A
Ignition Switch RUN, START, RUN/START/ACCY
IGN B
40A
Ignition Switch RUN/ACC, RUN/START
Could be ignition switch problem , Chevy has had problems with them .
Sounds like a bad crank sensor. It is needed to properly tell the firing order of vehicle. if the wrong signal it will not start. and to tell the coils to fire, If the coils have power to them and not sending it to plugs, Theres a possibility that the ignition module is bad! Check for cracks under or on bottom of coils. The ignition module is located under coil packs on most vehicles. Good-Day!
use test light see if fuse box grounded.hook 12 volt test light to good ground with ignition switch on probe top of all fuses see if test light turn on if yes fuse box getting good ground when you take 12 volt test light touch both sides top of ignition ecm 15 amp fuse and ecm battery 20 amp fuse should light up on both sides if one side left top side fuse light up with test light fuse is blowed.if fuses okay your fuse box has broke wire or inside fuse terminal corroded real bad.
need more information:
1. does the motor turn over when cranking, and just
won't start?
2. if not, when you turn the key to on position can you hear the fuel pump kicking in?
Chk. all fuses, there is a fuse for injectors, If no spark at plugs chk ignition fuse and switch, and chk. fuse for e.c.m. Can't help with diagram. Parts dept. chevy dealer will print you one out.
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