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Hello, my name is***** sounds like you either have an issue with the ignition switch or the positive battery cable. Most of the time this occurs when the battery cable has internal resistance which will cause this. If the cable is fine then the ignition switch is bad. It is common for the ignition switch to fail internally and cause this. A voltage drop test of the switch would need to be done to properly diagnose this.
It is located behind the key lock cylinder.