Chevrolet Repair Questions? Ask a Chevy Mechanic for Answers ASAP
Testing with key on or off?
ECM B, ECM 1, and ENG 1 ? Do you have voltage at HORN fuse?
Check the maxifuses for power, especially the IGN A and IGN B fuses
If there is voltage at these maxifuses then your problem is a failed ignition switch. These 3 fuses are all powered off the same contact within the ignition switch. Before replacing the switch, check wires at steering column leading up to the ignition switch. Sometimes these wires will break from flexing on vehicles with tilt steering columns. Wires are red and pink.
It would just have to be coincidence. There is no way replacing the fuel pump would interfere with ignition switch or wiring. But if you have no voltage to these fuses, that is where your problem has to be.
No, it would not typically damage the switch.
Yes, at the fuse panel, use a jumper wire to connect power from a good fuse over to one of the fuses that does not have voltage. Then attempt to start. If it does then this confirms the diagnosis.
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